diff --git a/lib/arborist/build-ideal-tree.js b/lib/arborist/build-ideal-tree.js
index ae9965e2e..d0150d238 100644
--- a/lib/arborist/build-ideal-tree.js
+++ b/lib/arborist/build-ideal-tree.js
@@ -1339,20 +1339,36 @@ This is a one-time fix-up, please be patient...
       // If strict or ours, conflict.  Otherwise, keep.
       if (isSource) {
         // check to see if the current module could go deeper in the tree
-        const peerSet = getPeerSet(current)
         let canReplace = true
-        OUTER: for (const p of peerSet) {
-          // if any have a non-peer dep from the target, or a peer dep if
-          // the target is root, then cannot safely replace and dupe deeper.
-          for (const edge of p.edgesIn) {
-            if (peerSet.has(edge.from))
-              continue
-
-            // only respect valid edges, however, since we're likely trying
-            // to fix the very one that's currently broken!
-            if (edge.from === target && edge.valid) {
-              canReplace = false
-              break OUTER
+        // only do this check when we're placing peers.  when we're placing
+        // the original in the source, we know that the edge from the source
+        // is the thing we're trying to place, so its peer set will need to be
+        // placed here as well.  the virtualRoot already has the appropriate
+        // overrides applied.
+        if (peerEntryEdge) {
+          const peerSet = getPeerSet(current)
+          OUTER: for (const p of peerSet) {
+            // if any have a non-peer dep from the target, or a peer dep if
+            // the target is root, then cannot safely replace and dupe deeper.
+            for (const edge of p.edgesIn) {
+              if (peerSet.has(edge.from))
+                continue
+
+              // only respect valid edges, however, since we're likely trying
+              // to fix the very one that's currently broken!  If the virtual
+              // root's replacement is ok, and doesn't have any invalid edges
+              // indicating that it was an overridden peer, then ignore the
+              // conflict and continue.  If it WAS an override, then we need
+              // to get the conflict here so that we can decide whether to
+              // accept the current dep node, clobber it, or fail the install.
+              if (edge.from === target && edge.valid) {
+                const rep = dep.parent.children.get(edge.name)
+                const override = rep && ([...rep.edgesIn].some(e => !e.valid))
+                if (!rep || !rep.satisfies(edge) || override) {
+                  canReplace = false
+                  break OUTER
+                }
+              }
             }
           }
         }
diff --git a/tap-snapshots/test-arborist-build-ideal-tree.js-TAP.test.js b/tap-snapshots/test-arborist-build-ideal-tree.js-TAP.test.js
index af94cfcfd..18c6ce018 100644
--- a/tap-snapshots/test-arborist-build-ideal-tree.js-TAP.test.js
+++ b/tap-snapshots/test-arborist-build-ideal-tree.js-TAP.test.js
@@ -258,467 +258,613 @@ Node {
 }
 `
 
-exports[`test/arborist/build-ideal-tree.js TAP bad shrinkwrap file > bad shrinkwrap 1`] = `
+exports[`test/arborist/build-ideal-tree.js TAP allow updating when peer outside of explicit update set conflict, but resolves appropriately with --force > succeed if force applied 1`] = `
 Node {
   "children": Map {
-    "@isaacs/testing-peer-deps-b" => Node {
+    "@isaacs/testing-peer-dep-conflict-chain-a" => Node {
       "edgesIn": Set {
         Edge {
           "from": "",
-          "name": "@isaacs/testing-peer-deps-b",
-          "spec": "1",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "2",
           "type": "prod",
         },
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-e",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "2",
+          "type": "peer",
+        },
+        Edge {
+          "error": "INVALID",
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "type": "peer",
+        },
+        Edge {
+          "error": "INVALID",
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "type": "peer",
+        },
       },
       "edgesOut": Map {
-        "@isaacs/testing-peer-deps-c" => Edge {
-          "name": "@isaacs/testing-peer-deps-c",
-          "spec": "1",
-          "to": "node_modules/@isaacs/testing-peer-deps-c",
+        "@isaacs/testing-peer-dep-conflict-chain-b" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-b",
+          "spec": "2",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-b",
           "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-peer-deps-b",
-      "name": "@isaacs/testing-peer-deps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-b/-/testing-peer-deps-b-1.2.4.tgz",
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-a/-/testing-peer-dep-conflict-chain-a-2.0.0.tgz",
     },
-    "@isaacs/testing-peer-deps-c" => Node {
+    "@isaacs/testing-peer-dep-conflict-chain-b" => Node {
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-peer-deps-b",
-          "name": "@isaacs/testing-peer-deps-c",
-          "spec": "1",
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-b",
+          "spec": "2",
           "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-peer-deps-c",
-      "name": "@isaacs/testing-peer-deps-c",
+      "edgesOut": Map {
+        "@isaacs/testing-peer-dep-conflict-chain-c" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-c",
+          "spec": "2",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-c",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-b",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-b",
       "peer": true,
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-c/-/testing-peer-deps-c-1.2.3.tgz",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-b/-/testing-peer-dep-conflict-chain-b-2.0.0.tgz",
     },
-    "@isaacs/testing-peer-deps-d" => Node {
-      "children": Map {
-        "@isaacs/testing-peer-deps-a" => Node {
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-peer-deps-d",
-              "name": "@isaacs/testing-peer-deps-a",
-              "spec": "2",
-              "type": "prod",
-            },
-          },
-          "edgesOut": Map {
-            "@isaacs/testing-peer-deps-b" => Edge {
-              "name": "@isaacs/testing-peer-deps-b",
-              "spec": "2",
-              "to": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-b",
-              "type": "peer",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-a",
-          "name": "@isaacs/testing-peer-deps-a",
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-a/-/testing-peer-deps-a-2.0.0.tgz",
+    "@isaacs/testing-peer-dep-conflict-chain-c" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-b",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-c",
+          "spec": "2",
+          "type": "peer",
         },
-        "@isaacs/testing-peer-deps-b" => Node {
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-a",
-              "name": "@isaacs/testing-peer-deps-b",
-              "spec": "2",
-              "type": "peer",
-            },
-          },
-          "edgesOut": Map {
-            "@isaacs/testing-peer-deps-c" => Edge {
-              "name": "@isaacs/testing-peer-deps-c",
-              "spec": "2",
-              "to": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-c",
-              "type": "peer",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-b",
-          "name": "@isaacs/testing-peer-deps-b",
-          "peer": true,
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-b/-/testing-peer-deps-b-2.0.1.tgz",
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-peer-dep-conflict-chain-d" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-d",
+          "spec": "2",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-d",
+          "type": "peer",
         },
-        "@isaacs/testing-peer-deps-c" => Node {
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-b",
-              "name": "@isaacs/testing-peer-deps-c",
-              "spec": "2",
-              "type": "peer",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-c",
-          "name": "@isaacs/testing-peer-deps-c",
-          "peer": true,
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-c/-/testing-peer-deps-c-2.0.0.tgz",
+      },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-c",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-c",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-c/-/testing-peer-dep-conflict-chain-c-2.0.0.tgz",
+    },
+    "@isaacs/testing-peer-dep-conflict-chain-d" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-c",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-d",
+          "spec": "2",
+          "type": "peer",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-peer-dep-conflict-chain-e" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-e",
+          "spec": "2",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-e",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-d",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-d",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-d/-/testing-peer-dep-conflict-chain-d-2.0.0.tgz",
+    },
+    "@isaacs/testing-peer-dep-conflict-chain-e" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-d",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-e",
+          "spec": "2",
+          "type": "peer",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-peer-dep-conflict-chain-a" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "2",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+          "type": "peer",
         },
       },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-e",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-e",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-e/-/testing-peer-dep-conflict-chain-e-2.0.0.tgz",
+    },
+    "@isaacs/testing-peer-dep-conflict-chain-single-a" => Node {
       "edgesIn": Set {
         Edge {
           "from": "",
-          "name": "@isaacs/testing-peer-deps-d",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
           "spec": "2",
           "type": "prod",
         },
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "spec": "2",
+          "type": "peer",
+        },
       },
       "edgesOut": Map {
-        "@isaacs/testing-peer-deps-a" => Edge {
-          "name": "@isaacs/testing-peer-deps-a",
+        "@isaacs/testing-peer-dep-conflict-chain-a" => Edge {
+          "error": "INVALID",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-a/-/testing-peer-dep-conflict-chain-single-a-2.0.1.tgz",
+    },
+    "@isaacs/testing-peer-dep-conflict-chain-single-b" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-single-b",
           "spec": "2",
-          "to": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-a",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-peer-deps-d",
-      "name": "@isaacs/testing-peer-deps-d",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-d/-/testing-peer-deps-d-2.0.0.tgz",
+      "edgesOut": Map {
+        "@isaacs/testing-peer-dep-conflict-chain-a" => Edge {
+          "error": "INVALID",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+          "type": "peer",
+        },
+        "@isaacs/testing-peer-dep-conflict-chain-single-a" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "spec": "2",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-b/-/testing-peer-dep-conflict-chain-single-b-2.0.1.tgz",
     },
   },
   "edgesOut": Map {
-    "@isaacs/testing-peer-deps-b" => Edge {
-      "name": "@isaacs/testing-peer-deps-b",
-      "spec": "1",
-      "to": "node_modules/@isaacs/testing-peer-deps-b",
+    "@isaacs/testing-peer-dep-conflict-chain-a" => Edge {
+      "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+      "spec": "2",
+      "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
       "type": "prod",
     },
-    "@isaacs/testing-peer-deps-d" => Edge {
-      "name": "@isaacs/testing-peer-deps-d",
+    "@isaacs/testing-peer-dep-conflict-chain-single-a" => Edge {
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
       "spec": "2",
-      "to": "node_modules/@isaacs/testing-peer-deps-d",
+      "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a",
+      "type": "prod",
+    },
+    "@isaacs/testing-peer-dep-conflict-chain-single-b" => Edge {
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-b",
+      "spec": "2",
+      "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b",
       "type": "prod",
     },
   },
   "location": "",
-  "name": "testing-peer-deps-bad-sw",
+  "name": "build-ideal-tree-allow-updating-when-peer-outside-of-explicit-update-set-conflict-but-resolves-appropriately-with-force",
   "resolved": null,
 }
 `
 
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, complete:true > no missing deps, because complete: true 1`] = `
+exports[`test/arborist/build-ideal-tree.js TAP allow updating when peer outside of explicit update set valid, no force required > must match snapshot 1`] = `
 Node {
   "children": Map {
-    "@isaacs/testing-bundledeps" => Node {
-      "children": Map {
-        "@isaacs/testing-bundledeps-a" => Node {
-          "bundled": true,
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-bundledeps",
-              "name": "@isaacs/testing-bundledeps-a",
-              "spec": "*",
-              "type": "prod",
-            },
-          },
-          "edgesOut": Map {
-            "@isaacs/testing-bundledeps-b" => Edge {
-              "name": "@isaacs/testing-bundledeps-b",
-              "spec": "*",
-              "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
-              "type": "prod",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
-          "name": "@isaacs/testing-bundledeps-a",
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
-        },
-        "@isaacs/testing-bundledeps-b" => Node {
-          "bundled": true,
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
-              "name": "@isaacs/testing-bundledeps-b",
-              "spec": "*",
-              "type": "prod",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
-          "name": "@isaacs/testing-bundledeps-b",
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
-        },
-      },
+    "@isaacs/testing-peer-dep-conflict-chain-a" => Node {
       "edgesIn": Set {
         Edge {
           "from": "",
-          "name": "@isaacs/testing-bundledeps",
-          "spec": "*",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
           "type": "prod",
         },
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-e",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "type": "peer",
+        },
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "type": "peer",
+        },
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "type": "peer",
+        },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-a" => Edge {
-          "name": "@isaacs/testing-bundledeps-a",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
-          "type": "prod",
-        },
-        "@isaacs/testing-bundledeps-c" => Edge {
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-c",
-          "type": "prod",
+        "@isaacs/testing-peer-dep-conflict-chain-b" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-b",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-b",
+          "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps",
-      "name": "@isaacs/testing-bundledeps",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-a/-/testing-peer-dep-conflict-chain-a-1.0.0.tgz",
     },
-    "@isaacs/testing-bundledeps-b" => Node {
+    "@isaacs/testing-peer-dep-conflict-chain-b" => Node {
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-c",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "type": "prod",
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-b",
+          "spec": "1",
+          "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-b",
-      "name": "@isaacs/testing-bundledeps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      "edgesOut": Map {
+        "@isaacs/testing-peer-dep-conflict-chain-c" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-c",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-c",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-b",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-b",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-b/-/testing-peer-dep-conflict-chain-b-1.0.0.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Node {
+    "@isaacs/testing-peer-dep-conflict-chain-c" => Node {
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps",
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
-          "type": "prod",
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-b",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-c",
+          "spec": "1",
+          "type": "peer",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
-          "type": "prod",
+        "@isaacs/testing-peer-dep-conflict-chain-d" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-d",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-d",
+          "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-c",
-      "name": "@isaacs/testing-bundledeps-c",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
-    },
-  },
-  "edgesOut": Map {
-    "@isaacs/testing-bundledeps" => Edge {
-      "name": "@isaacs/testing-bundledeps",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps",
-      "type": "prod",
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-c",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-c",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-c/-/testing-peer-dep-conflict-chain-c-1.0.0.tgz",
     },
-  },
-  "location": "",
-  "name": "testing-bundledeps-empty",
-  "resolved": null,
-}
-`
-
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, complete:true > no missing deps, because complete:true 1`] = `
-Node {
-  "children": Map {
-    "@isaacs/testing-bundledeps" => Node {
-      "bundled": true,
-      "children": Map {
-        "@isaacs/testing-bundledeps-a" => Node {
-          "bundled": true,
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-bundledeps",
-              "name": "@isaacs/testing-bundledeps-a",
-              "spec": "*",
-              "type": "prod",
-            },
-          },
-          "edgesOut": Map {
-            "@isaacs/testing-bundledeps-b" => Edge {
-              "name": "@isaacs/testing-bundledeps-b",
-              "spec": "*",
-              "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
-              "type": "prod",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
-          "name": "@isaacs/testing-bundledeps-a",
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+    "@isaacs/testing-peer-dep-conflict-chain-d" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-c",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-d",
+          "spec": "1",
+          "type": "peer",
         },
-        "@isaacs/testing-bundledeps-b" => Node {
-          "bundled": true,
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
-              "name": "@isaacs/testing-bundledeps-b",
-              "spec": "*",
-              "type": "prod",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
-          "name": "@isaacs/testing-bundledeps-b",
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-peer-dep-conflict-chain-e" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-e",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-e",
+          "type": "peer",
         },
       },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-d",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-d",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-d/-/testing-peer-dep-conflict-chain-d-1.0.0.tgz",
+    },
+    "@isaacs/testing-peer-dep-conflict-chain-e" => Node {
       "edgesIn": Set {
         Edge {
-          "from": "",
-          "name": "@isaacs/testing-bundledeps",
-          "spec": "*",
-          "type": "prod",
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-d",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-e",
+          "spec": "1",
+          "type": "peer",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-a" => Edge {
-          "name": "@isaacs/testing-bundledeps-a",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
-          "type": "prod",
-        },
-        "@isaacs/testing-bundledeps-c" => Edge {
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-c",
-          "type": "prod",
+        "@isaacs/testing-peer-dep-conflict-chain-a" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+          "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps",
-      "name": "@isaacs/testing-bundledeps",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-e",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-e",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-e/-/testing-peer-dep-conflict-chain-e-1.0.0.tgz",
     },
-    "@isaacs/testing-bundledeps-b" => Node {
-      "bundled": true,
+    "@isaacs/testing-peer-dep-conflict-chain-single-a" => Node {
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-c",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
+          "from": "",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "spec": "2",
           "type": "prod",
         },
+        Edge {
+          "from": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "spec": "2",
+          "type": "peer",
+        },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-b",
-      "name": "@isaacs/testing-bundledeps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      "edgesOut": Map {
+        "@isaacs/testing-peer-dep-conflict-chain-a" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-a/-/testing-peer-dep-conflict-chain-single-a-2.0.1.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Node {
-      "bundled": true,
+    "@isaacs/testing-peer-dep-conflict-chain-single-b" => Node {
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps",
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
+          "from": "",
+          "name": "@isaacs/testing-peer-dep-conflict-chain-single-b",
+          "spec": "2",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
-          "type": "prod",
+        "@isaacs/testing-peer-dep-conflict-chain-a" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+          "type": "peer",
+        },
+        "@isaacs/testing-peer-dep-conflict-chain-single-a" => Edge {
+          "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "spec": "2",
+          "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a",
+          "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-c",
-      "name": "@isaacs/testing-bundledeps-c",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+      "location": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b",
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-b/-/testing-peer-dep-conflict-chain-single-b-2.0.1.tgz",
     },
   },
   "edgesOut": Map {
-    "@isaacs/testing-bundledeps" => Edge {
-      "name": "@isaacs/testing-bundledeps",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps",
+    "@isaacs/testing-peer-dep-conflict-chain-a" => Edge {
+      "name": "@isaacs/testing-peer-dep-conflict-chain-a",
+      "spec": "1",
+      "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-a",
+      "type": "prod",
+    },
+    "@isaacs/testing-peer-dep-conflict-chain-single-a" => Edge {
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+      "spec": "2",
+      "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a",
+      "type": "prod",
+    },
+    "@isaacs/testing-peer-dep-conflict-chain-single-b" => Edge {
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-b",
+      "spec": "2",
+      "to": "node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b",
       "type": "prod",
     },
   },
   "location": "",
-  "name": "testing-bundledeps-empty",
+  "name": "build-ideal-tree-allow-updating-when-peer-outside-of-explicit-update-set-valid-no-force-required",
   "resolved": null,
 }
 `
 
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, empty > bundle deps testing 1`] = `
+exports[`test/arborist/build-ideal-tree.js TAP bad shrinkwrap file > bad shrinkwrap 1`] = `
 Node {
   "children": Map {
-    "@isaacs/testing-bundledeps" => Node {
+    "@isaacs/testing-peer-deps-b" => Node {
       "edgesIn": Set {
         Edge {
           "from": "",
-          "name": "@isaacs/testing-bundledeps",
-          "spec": "*",
+          "name": "@isaacs/testing-peer-deps-b",
+          "spec": "1",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-a" => Edge {
-          "error": "MISSING",
-          "name": "@isaacs/testing-bundledeps-a",
-          "spec": "*",
-          "to": null,
-          "type": "prod",
-        },
-        "@isaacs/testing-bundledeps-c" => Edge {
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-c",
-          "type": "prod",
+        "@isaacs/testing-peer-deps-c" => Edge {
+          "name": "@isaacs/testing-peer-deps-c",
+          "spec": "1",
+          "to": "node_modules/@isaacs/testing-peer-deps-c",
+          "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps",
-      "name": "@isaacs/testing-bundledeps",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+      "location": "node_modules/@isaacs/testing-peer-deps-b",
+      "name": "@isaacs/testing-peer-deps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-b/-/testing-peer-deps-b-1.2.4.tgz",
     },
-    "@isaacs/testing-bundledeps-b" => Node {
+    "@isaacs/testing-peer-deps-c" => Node {
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-c",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "type": "prod",
+          "from": "node_modules/@isaacs/testing-peer-deps-b",
+          "name": "@isaacs/testing-peer-deps-c",
+          "spec": "1",
+          "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-b",
-      "name": "@isaacs/testing-bundledeps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      "location": "node_modules/@isaacs/testing-peer-deps-c",
+      "name": "@isaacs/testing-peer-deps-c",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-c/-/testing-peer-deps-c-1.2.3.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Node {
+    "@isaacs/testing-peer-deps-d" => Node {
+      "children": Map {
+        "@isaacs/testing-peer-deps-a" => Node {
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-peer-deps-d",
+              "name": "@isaacs/testing-peer-deps-a",
+              "spec": "2",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "@isaacs/testing-peer-deps-b" => Edge {
+              "name": "@isaacs/testing-peer-deps-b",
+              "spec": "2",
+              "to": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-b",
+              "type": "peer",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-a",
+          "name": "@isaacs/testing-peer-deps-a",
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-a/-/testing-peer-deps-a-2.0.0.tgz",
+        },
+        "@isaacs/testing-peer-deps-b" => Node {
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-a",
+              "name": "@isaacs/testing-peer-deps-b",
+              "spec": "2",
+              "type": "peer",
+            },
+          },
+          "edgesOut": Map {
+            "@isaacs/testing-peer-deps-c" => Edge {
+              "name": "@isaacs/testing-peer-deps-c",
+              "spec": "2",
+              "to": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-c",
+              "type": "peer",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-b",
+          "name": "@isaacs/testing-peer-deps-b",
+          "peer": true,
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-b/-/testing-peer-deps-b-2.0.1.tgz",
+        },
+        "@isaacs/testing-peer-deps-c" => Node {
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-b",
+              "name": "@isaacs/testing-peer-deps-c",
+              "spec": "2",
+              "type": "peer",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-c",
+          "name": "@isaacs/testing-peer-deps-c",
+          "peer": true,
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-c/-/testing-peer-deps-c-2.0.0.tgz",
+        },
+      },
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps",
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
+          "from": "",
+          "name": "@isaacs/testing-peer-deps-d",
+          "spec": "2",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
+        "@isaacs/testing-peer-deps-a" => Edge {
+          "name": "@isaacs/testing-peer-deps-a",
+          "spec": "2",
+          "to": "node_modules/@isaacs/testing-peer-deps-d/node_modules/@isaacs/testing-peer-deps-a",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-c",
-      "name": "@isaacs/testing-bundledeps-c",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+      "location": "node_modules/@isaacs/testing-peer-deps-d",
+      "name": "@isaacs/testing-peer-deps-d",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-peer-deps-d/-/testing-peer-deps-d-2.0.0.tgz",
     },
   },
   "edgesOut": Map {
-    "@isaacs/testing-bundledeps" => Edge {
-      "name": "@isaacs/testing-bundledeps",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps",
+    "@isaacs/testing-peer-deps-b" => Edge {
+      "name": "@isaacs/testing-peer-deps-b",
+      "spec": "1",
+      "to": "node_modules/@isaacs/testing-peer-deps-b",
+      "type": "prod",
+    },
+    "@isaacs/testing-peer-deps-d" => Edge {
+      "name": "@isaacs/testing-peer-deps-d",
+      "spec": "2",
+      "to": "node_modules/@isaacs/testing-peer-deps-d",
       "type": "prod",
     },
   },
   "location": "",
-  "name": "testing-bundledeps-empty",
+  "name": "testing-peer-deps-bad-sw",
   "resolved": null,
 }
 `
 
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, empty > should have some missing deps in the ideal tree 1`] = `
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, complete:true > no missing deps, because complete: true 1`] = `
 Node {
   "children": Map {
     "@isaacs/testing-bundledeps" => Node {
-      "bundled": true,
+      "children": Map {
+        "@isaacs/testing-bundledeps-a" => Node {
+          "bundled": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-bundledeps",
+              "name": "@isaacs/testing-bundledeps-a",
+              "spec": "*",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "@isaacs/testing-bundledeps-b" => Edge {
+              "name": "@isaacs/testing-bundledeps-b",
+              "spec": "*",
+              "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+          "name": "@isaacs/testing-bundledeps-a",
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+        },
+        "@isaacs/testing-bundledeps-b" => Node {
+          "bundled": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+              "name": "@isaacs/testing-bundledeps-b",
+              "spec": "*",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
+          "name": "@isaacs/testing-bundledeps-b",
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+        },
+      },
       "edgesIn": Set {
         Edge {
           "from": "",
@@ -729,10 +875,9 @@ Node {
       },
       "edgesOut": Map {
         "@isaacs/testing-bundledeps-a" => Edge {
-          "error": "MISSING",
           "name": "@isaacs/testing-bundledeps-a",
           "spec": "*",
-          "to": null,
+          "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
           "type": "prod",
         },
         "@isaacs/testing-bundledeps-c" => Edge {
@@ -747,7 +892,6 @@ Node {
       "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
     },
     "@isaacs/testing-bundledeps-b" => Node {
-      "bundled": true,
       "edgesIn": Set {
         Edge {
           "from": "node_modules/@isaacs/testing-bundledeps-c",
@@ -761,7 +905,6 @@ Node {
       "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
     },
     "@isaacs/testing-bundledeps-c" => Node {
-      "bundled": true,
       "edgesIn": Set {
         Edge {
           "from": "node_modules/@isaacs/testing-bundledeps",
@@ -797,7 +940,7 @@ Node {
 }
 `
 
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, full > add stuff, no missing deps 1`] = `
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, complete:true > no missing deps, because complete:true 1`] = `
 Node {
   "children": Map {
     "@isaacs/testing-bundledeps" => Node {
@@ -855,408 +998,4364 @@ Node {
           "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
           "type": "prod",
         },
-        "@isaacs/testing-bundledeps-c" => Edge {
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-c",
+        "@isaacs/testing-bundledeps-c" => Edge {
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-c",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps",
+      "name": "@isaacs/testing-bundledeps",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-b" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-c",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-b",
+      "name": "@isaacs/testing-bundledeps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-c" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps",
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-c",
+      "name": "@isaacs/testing-bundledeps-c",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+    },
+  },
+  "edgesOut": Map {
+    "@isaacs/testing-bundledeps" => Edge {
+      "name": "@isaacs/testing-bundledeps",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps",
+      "type": "prod",
+    },
+  },
+  "location": "",
+  "name": "testing-bundledeps-empty",
+  "resolved": null,
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, empty > bundle deps testing 1`] = `
+Node {
+  "children": Map {
+    "@isaacs/testing-bundledeps" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-a" => Edge {
+          "error": "MISSING",
+          "name": "@isaacs/testing-bundledeps-a",
+          "spec": "*",
+          "to": null,
+          "type": "prod",
+        },
+        "@isaacs/testing-bundledeps-c" => Edge {
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-c",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps",
+      "name": "@isaacs/testing-bundledeps",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-b" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-c",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-b",
+      "name": "@isaacs/testing-bundledeps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-c" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps",
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-c",
+      "name": "@isaacs/testing-bundledeps-c",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+    },
+  },
+  "edgesOut": Map {
+    "@isaacs/testing-bundledeps" => Edge {
+      "name": "@isaacs/testing-bundledeps",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps",
+      "type": "prod",
+    },
+  },
+  "location": "",
+  "name": "testing-bundledeps-empty",
+  "resolved": null,
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, empty > should have some missing deps in the ideal tree 1`] = `
+Node {
+  "children": Map {
+    "@isaacs/testing-bundledeps" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-a" => Edge {
+          "error": "MISSING",
+          "name": "@isaacs/testing-bundledeps-a",
+          "spec": "*",
+          "to": null,
+          "type": "prod",
+        },
+        "@isaacs/testing-bundledeps-c" => Edge {
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-c",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps",
+      "name": "@isaacs/testing-bundledeps",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-b" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-c",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-b",
+      "name": "@isaacs/testing-bundledeps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-c" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps",
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-c",
+      "name": "@isaacs/testing-bundledeps-c",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+    },
+  },
+  "edgesOut": Map {
+    "@isaacs/testing-bundledeps" => Edge {
+      "name": "@isaacs/testing-bundledeps",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps",
+      "type": "prod",
+    },
+  },
+  "location": "",
+  "name": "testing-bundledeps-empty",
+  "resolved": null,
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, full > add stuff, no missing deps 1`] = `
+Node {
+  "children": Map {
+    "@isaacs/testing-bundledeps" => Node {
+      "bundled": true,
+      "children": Map {
+        "@isaacs/testing-bundledeps-a" => Node {
+          "bundled": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-bundledeps",
+              "name": "@isaacs/testing-bundledeps-a",
+              "spec": "*",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "@isaacs/testing-bundledeps-b" => Edge {
+              "name": "@isaacs/testing-bundledeps-b",
+              "spec": "*",
+              "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+          "name": "@isaacs/testing-bundledeps-a",
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+        },
+        "@isaacs/testing-bundledeps-b" => Node {
+          "bundled": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+              "name": "@isaacs/testing-bundledeps-b",
+              "spec": "*",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
+          "name": "@isaacs/testing-bundledeps-b",
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+        },
+      },
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-a" => Edge {
+          "name": "@isaacs/testing-bundledeps-a",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+          "type": "prod",
+        },
+        "@isaacs/testing-bundledeps-c" => Edge {
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-c",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps",
+      "name": "@isaacs/testing-bundledeps",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-b" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-c",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-b",
+      "name": "@isaacs/testing-bundledeps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-c" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps",
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-c",
+      "name": "@isaacs/testing-bundledeps-c",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-1.0.0.tgz",
+    },
+  },
+  "edgesOut": Map {
+    "@isaacs/testing-bundledeps" => Edge {
+      "name": "@isaacs/testing-bundledeps",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps",
+      "type": "prod",
+    },
+  },
+  "location": "",
+  "name": "testing-bundledeps",
+  "resolved": null,
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, full > no missing deps 1`] = `
+Node {
+  "children": Map {
+    "@isaacs/testing-bundledeps" => Node {
+      "children": Map {
+        "@isaacs/testing-bundledeps-a" => Node {
+          "bundled": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-bundledeps",
+              "name": "@isaacs/testing-bundledeps-a",
+              "spec": "*",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "@isaacs/testing-bundledeps-b" => Edge {
+              "name": "@isaacs/testing-bundledeps-b",
+              "spec": "*",
+              "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+          "name": "@isaacs/testing-bundledeps-a",
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+        },
+        "@isaacs/testing-bundledeps-b" => Node {
+          "bundled": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+              "name": "@isaacs/testing-bundledeps-b",
+              "spec": "*",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
+          "name": "@isaacs/testing-bundledeps-b",
+          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+        },
+      },
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-a" => Edge {
+          "name": "@isaacs/testing-bundledeps-a",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+          "type": "prod",
+        },
+        "@isaacs/testing-bundledeps-c" => Edge {
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-c",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps",
+      "name": "@isaacs/testing-bundledeps",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-b" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-c",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-b",
+      "name": "@isaacs/testing-bundledeps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-c" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps",
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-c",
+      "name": "@isaacs/testing-bundledeps-c",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-1.0.0.tgz",
+    },
+  },
+  "edgesOut": Map {
+    "@isaacs/testing-bundledeps" => Edge {
+      "name": "@isaacs/testing-bundledeps",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps",
+      "type": "prod",
+    },
+  },
+  "location": "",
+  "name": "testing-bundledeps",
+  "resolved": null,
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 2 > add new bundled dep c 1`] = `
+Node {
+  "children": Map {
+    "@isaacs/testing-bundledeps-a" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps-a",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-a",
+      "name": "@isaacs/testing-bundledeps-a",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-b" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-a",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-c",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-b",
+      "name": "@isaacs/testing-bundledeps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-c" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-c",
+      "name": "@isaacs/testing-bundledeps-c",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+    },
+  },
+  "edgesOut": Map {
+    "@isaacs/testing-bundledeps-a" => Edge {
+      "name": "@isaacs/testing-bundledeps-a",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps-a",
+      "type": "prod",
+    },
+    "@isaacs/testing-bundledeps-c" => Edge {
+      "name": "@isaacs/testing-bundledeps-c",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps-c",
+      "type": "prod",
+    },
+  },
+  "location": "",
+  "name": "testing-bundledeps-2",
+  "resolved": null,
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 2 > bundle deps testing 1`] = `
+Node {
+  "children": Map {
+    "@isaacs/testing-bundledeps-a" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps-a",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-a",
+      "name": "@isaacs/testing-bundledeps-a",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-b" => Node {
+      "bundled": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-a",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-c",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-b",
+      "name": "@isaacs/testing-bundledeps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-c" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-c",
+      "name": "@isaacs/testing-bundledeps-c",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+    },
+  },
+  "edgesOut": Map {
+    "@isaacs/testing-bundledeps-a" => Edge {
+      "name": "@isaacs/testing-bundledeps-a",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps-a",
+      "type": "prod",
+    },
+    "@isaacs/testing-bundledeps-c" => Edge {
+      "name": "@isaacs/testing-bundledeps-c",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps-c",
+      "type": "prod",
+    },
+  },
+  "location": "",
+  "name": "testing-bundledeps-2",
+  "resolved": null,
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 2 > remove bundled dependency a 1`] = `
+Node {
+  "children": Map {
+    "@isaacs/testing-bundledeps-b" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@isaacs/testing-bundledeps-c",
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-b",
+      "name": "@isaacs/testing-bundledeps-b",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+    },
+    "@isaacs/testing-bundledeps-c" => Node {
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@isaacs/testing-bundledeps-c",
+          "spec": "*",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@isaacs/testing-bundledeps-b" => Edge {
+          "name": "@isaacs/testing-bundledeps-b",
+          "spec": "*",
+          "to": "node_modules/@isaacs/testing-bundledeps-b",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@isaacs/testing-bundledeps-c",
+      "name": "@isaacs/testing-bundledeps-c",
+      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+    },
+  },
+  "edgesOut": Map {
+    "@isaacs/testing-bundledeps-c" => Edge {
+      "name": "@isaacs/testing-bundledeps-c",
+      "spec": "*",
+      "to": "node_modules/@isaacs/testing-bundledeps-c",
+      "type": "prod",
+    },
+  },
+  "location": "",
+  "name": "testing-bundledeps-2",
+  "resolved": null,
+}
+`
+
+exports[`test/arborist/build-ideal-tree.js TAP carbonium eslint conflicts > must match snapshot 1`] = `
+Node {
+  "children": Map {
+    "@babel/code-frame" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/eslint",
+          "name": "@babel/code-frame",
+          "spec": "^7.0.0",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@babel/highlight" => Edge {
+          "name": "@babel/highlight",
+          "spec": "^7.10.4",
+          "to": "node_modules/@babel/highlight",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@babel/code-frame",
+      "name": "@babel/code-frame",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.4.tgz",
+    },
+    "@babel/helper-validator-identifier" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@babel/highlight",
+          "name": "@babel/helper-validator-identifier",
+          "spec": "^7.10.4",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@babel/helper-validator-identifier",
+      "name": "@babel/helper-validator-identifier",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
+    },
+    "@babel/highlight" => Node {
+      "children": Map {
+        "ansi-styles" => Node {
+          "dev": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@babel/highlight/node_modules/chalk",
+              "name": "ansi-styles",
+              "spec": "^3.2.1",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "color-convert" => Edge {
+              "name": "color-convert",
+              "spec": "^1.9.0",
+              "to": "node_modules/@babel/highlight/node_modules/color-convert",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@babel/highlight/node_modules/ansi-styles",
+          "name": "ansi-styles",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+        },
+        "chalk" => Node {
+          "dev": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@babel/highlight",
+              "name": "chalk",
+              "spec": "^2.0.0",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "ansi-styles" => Edge {
+              "name": "ansi-styles",
+              "spec": "^3.2.1",
+              "to": "node_modules/@babel/highlight/node_modules/ansi-styles",
+              "type": "prod",
+            },
+            "escape-string-regexp" => Edge {
+              "name": "escape-string-regexp",
+              "spec": "^1.0.5",
+              "to": "node_modules/escape-string-regexp",
+              "type": "prod",
+            },
+            "supports-color" => Edge {
+              "name": "supports-color",
+              "spec": "^5.3.0",
+              "to": "node_modules/@babel/highlight/node_modules/supports-color",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@babel/highlight/node_modules/chalk",
+          "name": "chalk",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+        },
+        "color-convert" => Node {
+          "dev": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@babel/highlight/node_modules/ansi-styles",
+              "name": "color-convert",
+              "spec": "^1.9.0",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "color-name" => Edge {
+              "name": "color-name",
+              "spec": "1.1.3",
+              "to": "node_modules/@babel/highlight/node_modules/color-name",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@babel/highlight/node_modules/color-convert",
+          "name": "color-convert",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+        },
+        "color-name" => Node {
+          "dev": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@babel/highlight/node_modules/color-convert",
+              "name": "color-name",
+              "spec": "1.1.3",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@babel/highlight/node_modules/color-name",
+          "name": "color-name",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+        },
+        "has-flag" => Node {
+          "dev": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@babel/highlight/node_modules/supports-color",
+              "name": "has-flag",
+              "spec": "^3.0.0",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@babel/highlight/node_modules/has-flag",
+          "name": "has-flag",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+        },
+        "supports-color" => Node {
+          "dev": true,
+          "edgesIn": Set {
+            Edge {
+              "from": "node_modules/@babel/highlight/node_modules/chalk",
+              "name": "supports-color",
+              "spec": "^5.3.0",
+              "type": "prod",
+            },
+          },
+          "edgesOut": Map {
+            "has-flag" => Edge {
+              "name": "has-flag",
+              "spec": "^3.0.0",
+              "to": "node_modules/@babel/highlight/node_modules/has-flag",
+              "type": "prod",
+            },
+          },
+          "location": "node_modules/@babel/highlight/node_modules/supports-color",
+          "name": "supports-color",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+        },
+      },
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@babel/code-frame",
+          "name": "@babel/highlight",
+          "spec": "^7.10.4",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@babel/helper-validator-identifier" => Edge {
+          "name": "@babel/helper-validator-identifier",
+          "spec": "^7.10.4",
+          "to": "node_modules/@babel/helper-validator-identifier",
+          "type": "prod",
+        },
+        "chalk" => Edge {
+          "name": "chalk",
+          "spec": "^2.0.0",
+          "to": "node_modules/@babel/highlight/node_modules/chalk",
+          "type": "prod",
+        },
+        "js-tokens" => Edge {
+          "name": "js-tokens",
+          "spec": "^4.0.0",
+          "to": "node_modules/js-tokens",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@babel/highlight",
+      "name": "@babel/highlight",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
+    },
+    "@eslint/eslintrc" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/eslint",
+          "name": "@eslint/eslintrc",
+          "spec": "^0.1.3",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "ajv" => Edge {
+          "name": "ajv",
+          "spec": "^6.12.4",
+          "to": "node_modules/ajv",
+          "type": "prod",
+        },
+        "debug" => Edge {
+          "name": "debug",
+          "spec": "^4.1.1",
+          "to": "node_modules/debug",
+          "type": "prod",
+        },
+        "espree" => Edge {
+          "name": "espree",
+          "spec": "^7.3.0",
+          "to": "node_modules/espree",
+          "type": "prod",
+        },
+        "globals" => Edge {
+          "name": "globals",
+          "spec": "^12.1.0",
+          "to": "node_modules/globals",
+          "type": "prod",
+        },
+        "ignore" => Edge {
+          "name": "ignore",
+          "spec": "^4.0.6",
+          "to": "node_modules/ignore",
+          "type": "prod",
+        },
+        "import-fresh" => Edge {
+          "name": "import-fresh",
+          "spec": "^3.2.1",
+          "to": "node_modules/import-fresh",
+          "type": "prod",
+        },
+        "js-yaml" => Edge {
+          "name": "js-yaml",
+          "spec": "^3.13.1",
+          "to": "node_modules/js-yaml",
+          "type": "prod",
+        },
+        "lodash" => Edge {
+          "name": "lodash",
+          "spec": "^4.17.19",
+          "to": "node_modules/lodash",
+          "type": "prod",
+        },
+        "minimatch" => Edge {
+          "name": "minimatch",
+          "spec": "^3.0.4",
+          "to": "node_modules/minimatch",
+          "type": "prod",
+        },
+        "strip-json-comments" => Edge {
+          "name": "strip-json-comments",
+          "spec": "^3.1.1",
+          "to": "node_modules/strip-json-comments",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@eslint/eslintrc",
+      "name": "@eslint/eslintrc",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.1.3.tgz",
+    },
+    "@nodelib/fs.scandir" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@nodelib/fs.walk",
+          "name": "@nodelib/fs.scandir",
+          "spec": "2.1.3",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@nodelib/fs.stat" => Edge {
+          "name": "@nodelib/fs.stat",
+          "spec": "2.0.3",
+          "to": "node_modules/@nodelib/fs.stat",
+          "type": "prod",
+        },
+        "run-parallel" => Edge {
+          "name": "run-parallel",
+          "spec": "^1.1.9",
+          "to": "node_modules/run-parallel",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@nodelib/fs.scandir",
+      "name": "@nodelib/fs.scandir",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz",
+    },
+    "@nodelib/fs.stat" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@nodelib/fs.scandir",
+          "name": "@nodelib/fs.stat",
+          "spec": "2.0.3",
+          "type": "prod",
+        },
+        Edge {
+          "from": "node_modules/fast-glob",
+          "name": "@nodelib/fs.stat",
+          "spec": "^2.0.2",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@nodelib/fs.stat",
+      "name": "@nodelib/fs.stat",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.3.tgz",
+    },
+    "@nodelib/fs.walk" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/fast-glob",
+          "name": "@nodelib/fs.walk",
+          "spec": "^1.2.3",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@nodelib/fs.scandir" => Edge {
+          "name": "@nodelib/fs.scandir",
+          "spec": "2.1.3",
+          "to": "node_modules/@nodelib/fs.scandir",
+          "type": "prod",
+        },
+        "fastq" => Edge {
+          "name": "fastq",
+          "spec": "^1.6.0",
+          "to": "node_modules/fastq",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@nodelib/fs.walk",
+      "name": "@nodelib/fs.walk",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.4.tgz",
+    },
+    "@types/json-schema" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@typescript-eslint/experimental-utils",
+          "name": "@types/json-schema",
+          "spec": "^7.0.3",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@types/json-schema",
+      "name": "@types/json-schema",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.6.tgz",
+    },
+    "@typescript-eslint/eslint-plugin" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@typescript-eslint/eslint-plugin",
+          "spec": "4",
+          "type": "dev",
+        },
+      },
+      "edgesOut": Map {
+        "@typescript-eslint/experimental-utils" => Edge {
+          "name": "@typescript-eslint/experimental-utils",
+          "spec": "4.4.1",
+          "to": "node_modules/@typescript-eslint/experimental-utils",
+          "type": "prod",
+        },
+        "@typescript-eslint/parser" => Edge {
+          "name": "@typescript-eslint/parser",
+          "spec": "^4.0.0",
+          "to": "node_modules/@typescript-eslint/parser",
+          "type": "peer",
+        },
+        "@typescript-eslint/scope-manager" => Edge {
+          "name": "@typescript-eslint/scope-manager",
+          "spec": "4.4.1",
+          "to": "node_modules/@typescript-eslint/scope-manager",
+          "type": "prod",
+        },
+        "debug" => Edge {
+          "name": "debug",
+          "spec": "^4.1.1",
+          "to": "node_modules/debug",
+          "type": "prod",
+        },
+        "eslint" => Edge {
+          "name": "eslint",
+          "spec": "^5.0.0 || ^6.0.0 || ^7.0.0",
+          "to": "node_modules/eslint",
+          "type": "peer",
+        },
+        "functional-red-black-tree" => Edge {
+          "name": "functional-red-black-tree",
+          "spec": "^1.0.1",
+          "to": "node_modules/functional-red-black-tree",
+          "type": "prod",
+        },
+        "regexpp" => Edge {
+          "name": "regexpp",
+          "spec": "^3.0.0",
+          "to": "node_modules/regexpp",
+          "type": "prod",
+        },
+        "semver" => Edge {
+          "name": "semver",
+          "spec": "^7.3.2",
+          "to": "node_modules/semver",
+          "type": "prod",
+        },
+        "tsutils" => Edge {
+          "name": "tsutils",
+          "spec": "^3.17.1",
+          "to": "node_modules/tsutils",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@typescript-eslint/eslint-plugin",
+      "name": "@typescript-eslint/eslint-plugin",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-4.4.1.tgz",
+    },
+    "@typescript-eslint/experimental-utils" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/@typescript-eslint/eslint-plugin",
+          "name": "@typescript-eslint/experimental-utils",
+          "spec": "4.4.1",
+          "type": "prod",
+        },
+      },
+      "edgesOut": Map {
+        "@types/json-schema" => Edge {
+          "name": "@types/json-schema",
+          "spec": "^7.0.3",
+          "to": "node_modules/@types/json-schema",
+          "type": "prod",
+        },
+        "@typescript-eslint/scope-manager" => Edge {
+          "name": "@typescript-eslint/scope-manager",
+          "spec": "4.4.1",
+          "to": "node_modules/@typescript-eslint/scope-manager",
+          "type": "prod",
+        },
+        "@typescript-eslint/types" => Edge {
+          "name": "@typescript-eslint/types",
+          "spec": "4.4.1",
+          "to": "node_modules/@typescript-eslint/types",
+          "type": "prod",
+        },
+        "@typescript-eslint/typescript-estree" => Edge {
+          "name": "@typescript-eslint/typescript-estree",
+          "spec": "4.4.1",
+          "to": "node_modules/@typescript-eslint/typescript-estree",
+          "type": "prod",
+        },
+        "eslint" => Edge {
+          "name": "eslint",
+          "spec": "*",
+          "to": "node_modules/eslint",
+          "type": "peer",
+        },
+        "eslint-scope" => Edge {
+          "name": "eslint-scope",
+          "spec": "^5.0.0",
+          "to": "node_modules/eslint-scope",
+          "type": "prod",
+        },
+        "eslint-utils" => Edge {
+          "name": "eslint-utils",
+          "spec": "^2.0.0",
+          "to": "node_modules/eslint-utils",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/@typescript-eslint/experimental-utils",
+      "name": "@typescript-eslint/experimental-utils",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-4.4.1.tgz",
+    },
+    "@typescript-eslint/parser" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "",
+          "name": "@typescript-eslint/parser",
+          "spec": "4",
+          "type": "dev",
+        },
+        Edge {
+          "from": "node_modules/@typescript-eslint/eslint-plugin",
+          "name": "@typescript-eslint/parser",
+          "spec": "^4.0.0",
+          "type": "peer",
+        },
+      },
+      "edgesOut": Map {
+        "@typescript-eslint/scope-manager" => Edge {
+          "name": "@typescript-eslint/scope-manager",
+          "spec": "4.4.1",
+          "to": "node_modules/@typescript-eslint/scope-manager",
+          "type": "prod",
+        },
+        "@typescript-eslint/types" => Edge {
+          "name": "@typescript-eslint/types",
+          "spec": "4.4.1",
+          "to": "node_modules/@typescript-eslint/types",
+          "type": "prod",
+        },
+        "@typescript-eslint/typescript-estree" => Edge {
+          "name": "@typescript-eslint/typescript-estree",
+          "spec": "4.4.1",
+          "to": "node_modules/@typescript-eslint/typescript-estree",
+          "type": "prod",
+        },
+        "debug" => Edge {
+          "name": "debug",
+          "spec": "^4.1.1",
+          "to": "node_modules/debug",
+          "type": "prod",
+        },
+        "eslint" => Edge {
+          "name": "eslint",
+          "spec": "^5.0.0 || ^6.0.0 || ^7.0.0",
+          "to": "node_modules/eslint",
+          "type": "peer",
+        },
+      },
+      "location": "node_modules/@typescript-eslint/parser",
+      "name": "@typescript-eslint/parser",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-4.4.1.tgz",
+    },
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-          "from": "node_modules/@isaacs/testing-bundledeps-c",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
+          "from": "node_modules/chalk",
+          "name": "supports-color",
+          "spec": "^7.1.0",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-b",
-      "name": "@isaacs/testing-bundledeps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      "edgesOut": Map {
+        "has-flag" => Edge {
+          "name": "has-flag",
+          "spec": "^4.0.0",
+          "to": "node_modules/has-flag",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/supports-color",
+      "name": "supports-color",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Node {
-      "bundled": true,
+    "table" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps",
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
+          "from": "node_modules/eslint",
+          "name": "table",
+          "spec": "^5.2.3",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
+        "ajv" => Edge {
+          "name": "ajv",
+          "spec": "^6.10.2",
+          "to": "node_modules/ajv",
           "type": "prod",
         },
-      },
-      "location": "node_modules/@isaacs/testing-bundledeps-c",
-      "name": "@isaacs/testing-bundledeps-c",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-1.0.0.tgz",
-    },
-  },
-  "edgesOut": Map {
-    "@isaacs/testing-bundledeps" => Edge {
-      "name": "@isaacs/testing-bundledeps",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps",
-      "type": "prod",
-    },
-  },
-  "location": "",
-  "name": "testing-bundledeps",
-  "resolved": null,
-}
-`
-
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 1, full > no missing deps 1`] = `
-Node {
-  "children": Map {
-    "@isaacs/testing-bundledeps" => Node {
-      "children": Map {
-        "@isaacs/testing-bundledeps-a" => Node {
-          "bundled": true,
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-bundledeps",
-              "name": "@isaacs/testing-bundledeps-a",
-              "spec": "*",
-              "type": "prod",
-            },
-          },
-          "edgesOut": Map {
-            "@isaacs/testing-bundledeps-b" => Edge {
-              "name": "@isaacs/testing-bundledeps-b",
-              "spec": "*",
-              "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
-              "type": "prod",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
-          "name": "@isaacs/testing-bundledeps-a",
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+        "lodash" => Edge {
+          "name": "lodash",
+          "spec": "^4.17.14",
+          "to": "node_modules/lodash",
+          "type": "prod",
         },
-        "@isaacs/testing-bundledeps-b" => Node {
-          "bundled": true,
-          "edgesIn": Set {
-            Edge {
-              "from": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
-              "name": "@isaacs/testing-bundledeps-b",
-              "spec": "*",
-              "type": "prod",
-            },
-          },
-          "location": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-b",
-          "name": "@isaacs/testing-bundledeps-b",
-          "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+        "slice-ansi" => Edge {
+          "name": "slice-ansi",
+          "spec": "^2.1.0",
+          "to": "node_modules/slice-ansi",
+          "type": "prod",
+        },
+        "string-width" => Edge {
+          "name": "string-width",
+          "spec": "^3.0.0",
+          "to": "node_modules/string-width",
+          "type": "prod",
         },
       },
+      "location": "node_modules/table",
+      "name": "table",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+    },
+    "text-table" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "",
-          "name": "@isaacs/testing-bundledeps",
-          "spec": "*",
+          "from": "node_modules/eslint",
+          "name": "text-table",
+          "spec": "^0.2.0",
           "type": "prod",
         },
       },
-      "edgesOut": Map {
-        "@isaacs/testing-bundledeps-a" => Edge {
-          "name": "@isaacs/testing-bundledeps-a",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps/node_modules/@isaacs/testing-bundledeps-a",
+      "location": "node_modules/text-table",
+      "name": "text-table",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+    },
+    "to-regex-range" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/fill-range",
+          "name": "to-regex-range",
+          "spec": "^5.0.1",
           "type": "prod",
         },
-        "@isaacs/testing-bundledeps-c" => Edge {
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-c",
+      },
+      "edgesOut": Map {
+        "is-number" => Edge {
+          "name": "is-number",
+          "spec": "^7.0.0",
+          "to": "node_modules/is-number",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps",
-      "name": "@isaacs/testing-bundledeps",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps/-/testing-bundledeps-1.0.0.tgz",
+      "location": "node_modules/to-regex-range",
+      "name": "to-regex-range",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
     },
-    "@isaacs/testing-bundledeps-b" => Node {
+    "tslib" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-c",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
+          "from": "node_modules/tsutils",
+          "name": "tslib",
+          "spec": "^1.8.1",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-b",
-      "name": "@isaacs/testing-bundledeps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      "location": "node_modules/tslib",
+      "name": "tslib",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Node {
+    "tsutils" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps",
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
+          "from": "node_modules/@typescript-eslint/eslint-plugin",
+          "name": "tsutils",
+          "spec": "^3.17.1",
+          "type": "prod",
+        },
+        Edge {
+          "from": "node_modules/@typescript-eslint/typescript-estree",
+          "name": "tsutils",
+          "spec": "^3.17.1",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
+        "tslib" => Edge {
+          "name": "tslib",
+          "spec": "^1.8.1",
+          "to": "node_modules/tslib",
           "type": "prod",
         },
+        "typescript" => Edge {
+          "name": "typescript",
+          "spec": ">=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta",
+          "to": "node_modules/typescript",
+          "type": "peer",
+        },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-c",
-      "name": "@isaacs/testing-bundledeps-c",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-1.0.0.tgz",
-    },
-  },
-  "edgesOut": Map {
-    "@isaacs/testing-bundledeps" => Edge {
-      "name": "@isaacs/testing-bundledeps",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps",
-      "type": "prod",
+      "location": "node_modules/tsutils",
+      "name": "tsutils",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.17.1.tgz",
     },
-  },
-  "location": "",
-  "name": "testing-bundledeps",
-  "resolved": null,
-}
-`
-
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 2 > add new bundled dep c 1`] = `
-Node {
-  "children": Map {
-    "@isaacs/testing-bundledeps-a" => Node {
-      "bundled": true,
+    "type-check" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "",
-          "name": "@isaacs/testing-bundledeps-a",
-          "spec": "*",
+          "from": "node_modules/levn",
+          "name": "type-check",
+          "spec": "~0.4.0",
+          "type": "prod",
+        },
+        Edge {
+          "from": "node_modules/optionator",
+          "name": "type-check",
+          "spec": "^0.4.0",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
+        "prelude-ls" => Edge {
+          "name": "prelude-ls",
+          "spec": "^1.2.1",
+          "to": "node_modules/prelude-ls",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-a",
-      "name": "@isaacs/testing-bundledeps-a",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+      "location": "node_modules/type-check",
+      "name": "type-check",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
     },
-    "@isaacs/testing-bundledeps-b" => Node {
-      "bundled": true,
+    "type-fest" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-a",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "type": "prod",
-        },
-        Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-c",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
+          "from": "node_modules/globals",
+          "name": "type-fest",
+          "spec": "^0.8.1",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-b",
-      "name": "@isaacs/testing-bundledeps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      "location": "node_modules/type-fest",
+      "name": "type-fest",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Node {
-      "bundled": true,
+    "typescript" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "",
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
-          "type": "prod",
-        },
-      },
-      "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
-          "type": "prod",
+          "from": "node_modules/tsutils",
+          "name": "typescript",
+          "spec": ">=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta",
+          "type": "peer",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-c",
-      "name": "@isaacs/testing-bundledeps-c",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
-    },
-  },
-  "edgesOut": Map {
-    "@isaacs/testing-bundledeps-a" => Edge {
-      "name": "@isaacs/testing-bundledeps-a",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps-a",
-      "type": "prod",
-    },
-    "@isaacs/testing-bundledeps-c" => Edge {
-      "name": "@isaacs/testing-bundledeps-c",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps-c",
-      "type": "prod",
+      "location": "node_modules/typescript",
+      "name": "typescript",
+      "peer": true,
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.3.tgz",
     },
-  },
-  "location": "",
-  "name": "testing-bundledeps-2",
-  "resolved": null,
-}
-`
-
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 2 > bundle deps testing 1`] = `
-Node {
-  "children": Map {
-    "@isaacs/testing-bundledeps-a" => Node {
-      "bundled": true,
+    "uri-js" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "",
-          "name": "@isaacs/testing-bundledeps-a",
-          "spec": "*",
+          "from": "node_modules/ajv",
+          "name": "uri-js",
+          "spec": "^4.2.2",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
+        "punycode" => Edge {
+          "name": "punycode",
+          "spec": "^2.1.0",
+          "to": "node_modules/punycode",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-a",
-      "name": "@isaacs/testing-bundledeps-a",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-a/-/testing-bundledeps-a-1.0.0.tgz",
+      "location": "node_modules/uri-js",
+      "name": "uri-js",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.0.tgz",
     },
-    "@isaacs/testing-bundledeps-b" => Node {
-      "bundled": true,
+    "v8-compile-cache" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-a",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "type": "prod",
-        },
-        Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-c",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
+          "from": "node_modules/eslint",
+          "name": "v8-compile-cache",
+          "spec": "^2.0.3",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-b",
-      "name": "@isaacs/testing-bundledeps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      "location": "node_modules/v8-compile-cache",
+      "name": "v8-compile-cache",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.1.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Node {
+    "which" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "",
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
+          "from": "node_modules/cross-spawn",
+          "name": "which",
+          "spec": "^2.0.1",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
+        "isexe" => Edge {
+          "name": "isexe",
+          "spec": "^2.0.0",
+          "to": "node_modules/isexe",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-c",
-      "name": "@isaacs/testing-bundledeps-c",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
-    },
-  },
-  "edgesOut": Map {
-    "@isaacs/testing-bundledeps-a" => Edge {
-      "name": "@isaacs/testing-bundledeps-a",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps-a",
-      "type": "prod",
+      "location": "node_modules/which",
+      "name": "which",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Edge {
-      "name": "@isaacs/testing-bundledeps-c",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps-c",
-      "type": "prod",
+    "word-wrap" => Node {
+      "dev": true,
+      "edgesIn": Set {
+        Edge {
+          "from": "node_modules/optionator",
+          "name": "word-wrap",
+          "spec": "^1.2.3",
+          "type": "prod",
+        },
+      },
+      "location": "node_modules/word-wrap",
+      "name": "word-wrap",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
     },
-  },
-  "location": "",
-  "name": "testing-bundledeps-2",
-  "resolved": null,
-}
-`
-
-exports[`test/arborist/build-ideal-tree.js TAP bundle deps example 2 > remove bundled dependency a 1`] = `
-Node {
-  "children": Map {
-    "@isaacs/testing-bundledeps-b" => Node {
+    "wrappy" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "node_modules/@isaacs/testing-bundledeps-c",
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
+          "from": "node_modules/inflight",
+          "name": "wrappy",
+          "spec": "1",
+          "type": "prod",
+        },
+        Edge {
+          "from": "node_modules/once",
+          "name": "wrappy",
+          "spec": "1",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-b",
-      "name": "@isaacs/testing-bundledeps-b",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-b/-/testing-bundledeps-b-1.0.0.tgz",
+      "location": "node_modules/wrappy",
+      "name": "wrappy",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
     },
-    "@isaacs/testing-bundledeps-c" => Node {
+    "write" => Node {
+      "dev": true,
       "edgesIn": Set {
         Edge {
-          "from": "",
-          "name": "@isaacs/testing-bundledeps-c",
-          "spec": "*",
+          "from": "node_modules/flat-cache",
+          "name": "write",
+          "spec": "1.0.3",
           "type": "prod",
         },
       },
       "edgesOut": Map {
-        "@isaacs/testing-bundledeps-b" => Edge {
-          "name": "@isaacs/testing-bundledeps-b",
-          "spec": "*",
-          "to": "node_modules/@isaacs/testing-bundledeps-b",
+        "mkdirp" => Edge {
+          "name": "mkdirp",
+          "spec": "^0.5.1",
+          "to": "node_modules/mkdirp",
           "type": "prod",
         },
       },
-      "location": "node_modules/@isaacs/testing-bundledeps-c",
-      "name": "@isaacs/testing-bundledeps-c",
-      "resolved": "https://registry.npmjs.org/@isaacs/testing-bundledeps-c/-/testing-bundledeps-c-2.0.0.tgz",
+      "location": "node_modules/write",
+      "name": "write",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
     },
   },
   "edgesOut": Map {
-    "@isaacs/testing-bundledeps-c" => Edge {
-      "name": "@isaacs/testing-bundledeps-c",
-      "spec": "*",
-      "to": "node_modules/@isaacs/testing-bundledeps-c",
-      "type": "prod",
+    "@typescript-eslint/eslint-plugin" => Edge {
+      "name": "@typescript-eslint/eslint-plugin",
+      "spec": "4",
+      "to": "node_modules/@typescript-eslint/eslint-plugin",
+      "type": "dev",
+    },
+    "@typescript-eslint/parser" => Edge {
+      "name": "@typescript-eslint/parser",
+      "spec": "4",
+      "to": "node_modules/@typescript-eslint/parser",
+      "type": "dev",
+    },
+    "eslint" => Edge {
+      "name": "eslint",
+      "spec": "^7",
+      "to": "node_modules/eslint",
+      "type": "dev",
     },
   },
   "location": "",
-  "name": "testing-bundledeps-2",
+  "name": "carbonium",
   "resolved": null,
 }
 `
diff --git a/test/arborist/build-ideal-tree.js b/test/arborist/build-ideal-tree.js
index aab0005fd..316b0bd46 100644
--- a/test/arborist/build-ideal-tree.js
+++ b/test/arborist/build-ideal-tree.js
@@ -23,7 +23,6 @@ const warningTracker = () => {
   }
 }
 
-
 // two little helper functions to make the loaded trees
 // easier to look at in the snapshot results.
 const printEdge = (edge, inout) => ({
@@ -57,14 +56,14 @@ const printTree = tree => ({
       error: {
         code: tree.error.code,
         ...(tree.error.path ? { path: relative(__dirname, tree.error.path) }
-          : {}),
-      }
+        : {}),
+      },
     } : {}),
   ...(tree.isLink ? {
     target: {
       name: tree.target.name,
-      parent: tree.target.parent && tree.target.parent.location
-    }
+      parent: tree.target.parent && tree.target.parent.location,
+    },
   } : {}),
   ...(tree.inBundle ? { bundled: true } : {}),
   ...(tree.edgesIn.size ? {
@@ -75,19 +74,19 @@ const printTree = tree => ({
   ...(tree.edgesOut.size ? {
     edgesOut: new Map([...tree.edgesOut.entries()]
       .sort((a, b) => a[0].localeCompare(b[0]))
-      .map(([name, edge]) => [name, printEdge(edge, 'out')]))
+      .map(([name, edge]) => [name, printEdge(edge, 'out')])),
   } : {}),
-  ...( !tree.fsChildren.size ? {} : {
+  ...(!tree.fsChildren.size ? {} : {
     fsChildren: new Set([...tree.fsChildren]
       .sort((a, b) => a.path.localeCompare(b.path))
       .map(tree => printTree(tree))),
   }),
-  ...( tree.target || !tree.children.size ? {}
-    : {
-      children: new Map([...tree.children.entries()]
-        .sort((a, b) => a[0].localeCompare(b[0]))
-        .map(([name, tree]) => [name, printTree(tree)]))
-    }),
+  ...(tree.target || !tree.children.size ? {}
+  : {
+    children: new Map([...tree.children.entries()]
+      .sort((a, b) => a[0].localeCompare(b[0]))
+      .map(([name, tree]) => [name, printTree(tree)])),
+  }),
   __proto__: { constructor: tree.constructor },
 })
 
@@ -108,7 +107,9 @@ t.test('fail on mismatched engine when engineStrict is set', async t => {
     ...OPT,
     nodeVersion: '12.18.4',
     engineStrict: true,
-  }).then(() => { throw new Error('failed to fail') }), { code: 'EBADENGINE' })
+  }).then(() => {
+    throw new Error('failed to fail')
+  }), { code: 'EBADENGINE' })
 })
 
 t.test('fail on malformed package.json', t => {
@@ -146,8 +147,10 @@ t.test('fail on mismatched platform', async t => {
   const path = resolve(fixtures, 'platform-specification')
   t.rejects(buildIdeal(path, {
     ...OPT,
-    nodeVersion: '4.0.0'
-  }).then(() => { throw new Error('failed to fail') }), { code: 'EBADPLATFORM' })
+    nodeVersion: '4.0.0',
+  }).then(() => {
+    throw new Error('failed to fail')
+  }), { code: 'EBADPLATFORM' })
 })
 
 t.test('ignore mismatched platform for optional dependencies', async t => {
@@ -180,9 +183,9 @@ t.test('a tree with an outdated dep, missing dep, no lockfile', async t => {
     once: '1.3.3',
     wrappy: '1.0.1',
   }
-  for (const [name, version] of Object.entries(expected)) {
+  for (const [name, version] of Object.entries(expected))
     t.equal(tree.children.get(name).package.version, version, `expect ${name}@${version}`)
-  }
+
   t.matchSnapshot(printTree(tree), 'should not update all')
 })
 
@@ -232,27 +235,27 @@ t.test('cyclical peer deps', t => {
     t.resolveMatchSnapshot(printIdeal(path), 'cyclical peer deps')
       .then(() => t.resolveMatchSnapshot(printIdeal(path, {
         // just reload the dep at its current required version
-        add: [ '@isaacs/peer-dep-cycle-a' ],
+        add: ['@isaacs/peer-dep-cycle-a'],
       }), 'cyclical peer deps - reload a dependency'))
       .then(() => t.resolveMatchSnapshot(printIdeal(path, {
-        add: [ '@isaacs/peer-dep-cycle-a@2.x' ],
+        add: ['@isaacs/peer-dep-cycle-a@2.x'],
       }), 'cyclical peer deps - upgrade a package'))
       .then(() => t.rejects(printIdeal(path, {
         // this conflicts with the direct dep on a@1 PEER-> b@1
-        add: [ '@isaacs/peer-dep-cycle-b@2.x' ],
+        add: ['@isaacs/peer-dep-cycle-b@2.x'],
       })))
-        // this conflict is ok since we're using legacy peer deps
+    // this conflict is ok since we're using legacy peer deps
       .then(() => t.resolveMatchSnapshot(printIdeal(path, {
-        add: [ '@isaacs/peer-dep-cycle-b@2.x' ],
+        add: ['@isaacs/peer-dep-cycle-b@2.x'],
         legacyPeerDeps: true,
       })))
       .then(() => t.resolveMatchSnapshot(printIdeal(path, {
         // use @latest rather than @2.x to exercise the 'explicit tag' path
-        add: [ '@isaacs/peer-dep-cycle-b@latest' ],
-        rm: [ '@isaacs/peer-dep-cycle-a' ],
+        add: ['@isaacs/peer-dep-cycle-b@latest'],
+        rm: ['@isaacs/peer-dep-cycle-a'],
       }), 'can add b@2 if we remove a@1 dep'))
       .then(() => t.resolveMatchSnapshot(printIdeal(path, {
-        rm: [ '@isaacs/peer-dep-cycle-a' ],
+        rm: ['@isaacs/peer-dep-cycle-a'],
       }), 'remove the dep, prune everything'))
   ))
 })
@@ -280,8 +283,8 @@ t.test('nested cyclical peer deps', t => {
     t.matchSnapshot(await printIdeal(path), 'nested peer deps cycle')
 
     t.matchSnapshot(await printIdeal(path, {
-        // just make sure it works if it gets a spec object
-        add: [ npa('@isaacs/peer-dep-cycle-a@2.x') ],
+      // just make sure it works if it gets a spec object
+      add: [npa('@isaacs/peer-dep-cycle-a@2.x')],
     }), 'upgrade a')
 
     t.matchSnapshot(await printIdeal(path, {
@@ -294,7 +297,7 @@ t.test('nested cyclical peer deps', t => {
 
     t.matchSnapshot(await printIdeal(path, {
       force: true,
-      add: [ '@isaacs/peer-dep-cycle-c@2.x' ],
+      add: ['@isaacs/peer-dep-cycle-c@2.x'],
     }), 'upgrade c, forcibly')
 
     await t.rejects(printIdeal(path, {
@@ -303,7 +306,6 @@ t.test('nested cyclical peer deps', t => {
         '@isaacs/peer-dep-cycle-c@2.x',
       ],
     }), ers[path], 'try (and fail) to upgrade c and a incompatibly')
-
   }))
 })
 
@@ -333,7 +335,7 @@ t.test('dedupe example - deduped', t => {
 t.test('expose explicitRequest', async t => {
   const path = resolve(fixtures, 'simple')
   const arb = new Arborist({...OPT})
-  const tree = await arb.buildIdealTree({ add: [ 'abbrev' ] })
+  const tree = await arb.buildIdealTree({ add: ['abbrev'] })
   t.ok(arb.explicitRequests, 'exposes the explicit request')
   t.strictSame(arb.explicitRequests, new Set(['abbrev']))
   t.ok(arb.explicitRequests.has('abbrev'), 'should contain explicit item')
@@ -348,7 +350,7 @@ t.test('bundle deps example 1, empty', t => {
   return t.resolveMatchSnapshot(printIdeal(path), 'bundle deps testing')
     .then(() => t.resolveMatchSnapshot(printIdeal(path, {
       saveBundle: true,
-      add: [ '@isaacs/testing-bundledeps' ],
+      add: ['@isaacs/testing-bundledeps'],
     }), 'should have some missing deps in the ideal tree'))
 })
 
@@ -359,7 +361,7 @@ t.test('bundle deps example 1, full', t => {
   return t.resolveMatchSnapshot(printIdeal(path), 'no missing deps')
     .then(() => t.resolveMatchSnapshot(printIdeal(path, {
       saveBundle: true,
-      add: [ '@isaacs/testing-bundledeps' ],
+      add: ['@isaacs/testing-bundledeps'],
     }), 'add stuff, no missing deps'))
 })
 
@@ -372,7 +374,7 @@ t.test('bundle deps example 1, complete:true', t => {
   }), 'no missing deps, because complete: true')
     .then(() => t.resolveMatchSnapshot(printIdeal(path, {
       saveBundle: true,
-      add: [ '@isaacs/testing-bundledeps' ],
+      add: ['@isaacs/testing-bundledeps'],
       complete: true,
     }), 'no missing deps, because complete:true'))
 })
@@ -383,7 +385,7 @@ t.test('bundle deps example 2', t => {
   return t.resolveMatchSnapshot(printIdeal(path), 'bundle deps testing')
     .then(() => t.resolveMatchSnapshot(printIdeal(path, {
       saveBundle: true,
-      add: [ '@isaacs/testing-bundledeps-c' ],
+      add: ['@isaacs/testing-bundledeps-c'],
     }), 'add new bundled dep c'))
     .then(() => t.resolveMatchSnapshot(printIdeal(path, {
       rm: ['@isaacs/testing-bundledeps-a'],
@@ -448,7 +450,7 @@ t.test('update', t => {
 
     t.resolveMatchSnapshot(printIdeal(flowOutdated, {
       update: {
-        names: [ 'flow-parser' ],
+        names: ['flow-parser'],
       },
     }), 'update flow parser')
 
@@ -464,12 +466,12 @@ t.test('update', t => {
     t.resolveMatchSnapshot(printIdeal(tapAndFlow, {
       update: {
         all: true,
-      }
+      },
     }), 'update everything')
     t.resolveMatchSnapshot(printIdeal(tapAndFlow, {
       update: {
         names: ['ink'],
-      }
+      },
     }), 'update ink')
 
     t.end()
@@ -586,7 +588,7 @@ t.test('contrived dep placement tests', t => {
         name: 'virtual-root',
         path: '/virtual-root',
         pkg: { ...root.package },
-      })
+      }),
     })
     const a = new Arborist({ ...OPT })
     a[kPeerSetSource].set(sameFoo, root)
@@ -607,7 +609,7 @@ t.test('contrived dep placement tests', t => {
         name: 'virtual-root',
         path: '/virtual-root',
         pkg: { ...root.package },
-      })
+      }),
     })
     a[kPeerSetSource].set(tooNew, root)
     t.match(a[kCanPlaceDep](tooNew, root, existingBar.edgesOut.get('foo')),
@@ -626,7 +628,7 @@ t.test('contrived dep placement tests', t => {
         name: 'virtual-root',
         path: '/virtual-root',
         pkg: { ...root.package },
-      })
+      }),
     })
     // note: it'll actually not bother replacing in this case, because
     // the original edge is not an error, but the canPlace result is still
@@ -683,7 +685,7 @@ t.test('contrived dep placement tests', t => {
         name: 'virtual-root',
         path: '/virtual-root',
         pkg: { ...root.package },
-      })
+      }),
     })
     a[kPeerSetSource].set(newFoo, root)
 
@@ -707,7 +709,7 @@ t.test('contrived dep placement tests', t => {
         name: 'virtual-root',
         path: '/virtual-root',
         pkg: { ...root.package },
-      })
+      }),
     })
     t.match(a[kCanPlaceDep](tooNew, root, existingBar.edgesOut.get('foo')),
       Symbol('CONFLICT'), 'conflicts with root dependency')
@@ -734,25 +736,25 @@ t.test('contrived dep placement tests', t => {
         children: [
           {
             name: 'b',
-            pkg: { name: 'b', version: '1.0.0', dependencies: {c:''}},
+            pkg: { name: 'b', version: '1.0.0', dependencies: {c: ''}},
             children: [
               // gets its d1 dep from a's child node
               {
                 name: 'c',
-                pkg: { name: 'c', version: '1.0.0', dependencies: {d:'1'}},
+                pkg: { name: 'c', version: '1.0.0', dependencies: {d: '1'}},
               },
               // trying to place a d2 on behalf of this one
               {
                 name: 'e',
-                pkg: { name: 'e', version: '1.0.0', dependencies: {d:'2'}},
+                pkg: { name: 'e', version: '1.0.0', dependencies: {d: '2'}},
               },
             ],
           },
           // the dep being shadowed
           {
             name: 'd',
-            pkg: {name:'d', version: '1.0.0'},
-          }
+            pkg: {name: 'd', version: '1.0.0'},
+          },
         ],
       })
 
@@ -768,8 +770,8 @@ t.test('contrived dep placement tests', t => {
       }, 'gut check')
       const d2 = new Node({
         name: 'd',
-        pkg: {name:'d', version: '2.0.0'},
-        parent: new Node({ path: '/virtual-root' })
+        pkg: {name: 'd', version: '2.0.0'},
+        parent: new Node({ path: '/virtual-root' }),
       })
       a[kPeerSetSource].set(d2, e)
 
@@ -798,25 +800,25 @@ t.test('contrived dep placement tests', t => {
         children: [
           {
             name: 'b',
-            pkg: { name: 'b', version: '1.0.0', dependencies: {c:''}},
+            pkg: { name: 'b', version: '1.0.0', dependencies: {c: ''}},
             children: [
               // gets its d1 dep from a's child node
               {
                 name: 'c',
-                pkg: { name: 'c', version: '1.0.0', dependencies: {d:'1||2'}},
+                pkg: { name: 'c', version: '1.0.0', dependencies: {d: '1||2'}},
               },
               // trying to place a d2 on behalf of this one
               {
                 name: 'e',
-                pkg: { name: 'e', version: '1.0.0', dependencies: {d:'2'}},
+                pkg: { name: 'e', version: '1.0.0', dependencies: {d: '2'}},
               },
             ],
           },
           // the dep being shadowed
           {
             name: 'd',
-            pkg: {name:'d', version: '1.0.0'},
-          }
+            pkg: {name: 'd', version: '1.0.0'},
+          },
         ],
       })
 
@@ -832,8 +834,8 @@ t.test('contrived dep placement tests', t => {
       }, 'gut check')
       const d2 = new Node({
         name: 'd',
-        pkg: {name:'d', version: '2.0.0'},
-        parent: new Node({ path: '/virtual-root' })
+        pkg: {name: 'd', version: '2.0.0'},
+        parent: new Node({ path: '/virtual-root' }),
       })
 
       a[kPeerSetSource].set(d2, e)
@@ -941,10 +943,11 @@ t.test('contrived dep placement tests', t => {
             children: [
               {
                 name: 'e',
-                pkg: { name: 'e', dependencies: {
-                  c: '1',
-                  f: '',
-                }},
+                pkg: { name: 'e',
+                  dependencies: {
+                    c: '1',
+                    f: '',
+                  }},
                 children: [
                   { name: 'c', pkg: { name: 'c', version: '1.2.3' } },
                   {
@@ -1004,10 +1007,10 @@ t.test('contrived dep placement tests', t => {
       // attempting to place b@2 at root on behalf of a is a no-op, because
       // it's already there and fine.
       const root = new Node({
-        pkg: { dependencies: {a:'', b:'2'}},
+        pkg: { dependencies: {a: '', b: '2'}},
         path: '/root',
         children: [
-          { pkg: { name: 'a', version: '1.2.3', dependencies: {b:'2'}}},
+          { pkg: { name: 'a', version: '1.2.3', dependencies: {b: '2'}}},
           { pkg: { name: 'b', version: '2.3.4'}},
         ],
       })
@@ -1037,7 +1040,7 @@ t.test('contrived dep placement tests', t => {
     const a = new Arborist({ ...OPT })
     const root = new Node({
       path: '/some/path',
-      pkg: { name: 'root', dependencies: { 'foo': '*' }},
+      pkg: { name: 'root', dependencies: { foo: '*' }},
     })
     const target = new Node({
       path: '/some/other/path',
@@ -1052,7 +1055,7 @@ t.test('contrived dep placement tests', t => {
     })
     const bar = new Node({
       name: 'bar',
-      pkg: { name: 'bar', version:'1.2.3' },
+      pkg: { name: 'bar', version: '1.2.3' },
       parent: new Node({ path: '/virtual-root' }),
     })
     const edge = target.edgesOut.get('bar')
@@ -1069,7 +1072,7 @@ t.test('contrived dep placement tests', t => {
     const root = new Node({
       path: '/some/path',
       realpath: '/some/path',
-      pkg: { name: 'root', dependencies: { 'foo': '*' }},
+      pkg: { name: 'root', dependencies: { foo: '*' }},
     })
     const target = new Node({
       path: '/some/path/to/packages',
@@ -1085,7 +1088,7 @@ t.test('contrived dep placement tests', t => {
     })
     const bar = new Node({
       name: 'bar',
-      pkg: { name: 'bar', version:'1.2.3' },
+      pkg: { name: 'bar', version: '1.2.3' },
       parent: new Node({ path: '/virtual-root' }),
     })
     const edge = target.edgesOut.get('bar')
@@ -1102,12 +1105,12 @@ t.test('contrived dep placement tests', t => {
 
 t.test('global style', t => t.resolveMatchSnapshot(printIdeal(t.testdir(), {
   globalStyle: true,
-  add: [ 'rimraf' ],
+  add: ['rimraf'],
 })))
 
 t.test('global', t => t.resolveMatchSnapshot(printIdeal(t.testdir(), {
   global: true,
-  add: [ 'rimraf' ],
+  add: ['rimraf'],
 })))
 
 t.test('global has to add or remove', t => t.rejects(printIdeal(t.testdir(), {
@@ -1191,7 +1194,7 @@ t.test('no fix available, linked top package', async t => {
   t.matchSnapshot(printTree(await arb.buildIdealTree()))
   t.strictSame(checkLogs(), [['warn', 'audit',
     'Manual fix required in linked project at ./mkdirp-unfixable for mkdirp@*.\n' +
-    "'cd ./mkdirp-unfixable' and run 'npm audit' for details."
+    "'cd ./mkdirp-unfixable' and run 'npm audit' for details.",
   ]])
 })
 
@@ -1276,19 +1279,19 @@ t.test('add symlink that points to a symlink', t => {
     'global-prefix': {
       lib: {
         node_modules: {
-          a: t.fixture('symlink', '../../../linked-pkg')
-        }
-      }
+          a: t.fixture('symlink', '../../../linked-pkg'),
+        },
+      },
     },
     'linked-pkg': {
       'package.json': JSON.stringify({
         name: 'a',
-        version: '1.0.0'
-      })
+        version: '1.0.0',
+      }),
     },
     'my-project': {
-      'package.json': JSON.stringify({})
-    }
+      'package.json': JSON.stringify({}),
+    },
   })
   const path = resolve(fixt, 'my-project')
   const arb = new Arborist({
@@ -1299,8 +1302,8 @@ t.test('add symlink that points to a symlink', t => {
     add: [
       // simulates the string used by `npm link <pkg>` when
       // installing a package available in the global space
-      `file:${resolve(fixt, 'global-prefix/lib/node_modules/a')}`
-    ]
+      `file:${resolve(fixt, 'global-prefix/lib/node_modules/a')}`,
+    ],
   }).then(tree =>
     t.matchSnapshot(
       printTree(tree),
@@ -1342,14 +1345,14 @@ t.test('resolve links in global mode', t => {
   const path = t.testdir({
     global: {},
     lib: {
-      'my-project': {}
+      'my-project': {},
     },
     'linked-dep': {
       'package.json': JSON.stringify({
         name: 'linked-dep',
-        version: '1.0.0'
-      })
-    }
+        version: '1.0.0',
+      }),
+    },
   })
   const fixturedir = resolve(path, 'lib', 'my-project')
 
@@ -1511,7 +1514,7 @@ t.test('update a node if its bundled by the root project', async t => {
         'package.json': JSON.stringify({
           name: 'abbrev',
           version: '1.0.0',
-        })
+        }),
       },
     },
     'package.json': JSON.stringify({
@@ -1546,7 +1549,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-a': '1',
           '@isaacs/testing-peer-dep-conflict-chain-b': '2',
-        }
+        },
       },
       error: true,
     },
@@ -1555,7 +1558,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-a': '2',
           '@isaacs/testing-peer-dep-conflict-chain-b': '1',
-        }
+        },
       },
       error: true,
     },
@@ -1567,7 +1570,7 @@ t.test('more peer dep conflicts', t => {
           '@isaacs/testing-peer-dep-conflict-chain-c': '2',
           '@isaacs/testing-peer-dep-conflict-chain-d': '2',
           '@isaacs/testing-peer-dep-conflict-chain-e': '2',
-        }
+        },
       },
       error: true,
     },
@@ -1579,7 +1582,7 @@ t.test('more peer dep conflicts', t => {
           '@isaacs/testing-peer-dep-conflict-chain-c': '1',
           '@isaacs/testing-peer-dep-conflict-chain-d': '1',
           '@isaacs/testing-peer-dep-conflict-chain-e': '1',
-        }
+        },
       },
       error: true,
     },
@@ -1591,7 +1594,7 @@ t.test('more peer dep conflicts', t => {
           '@isaacs/testing-peer-dep-conflict-chain-b': '1',
           '@isaacs/testing-peer-dep-conflict-chain-l': '1',
           '@isaacs/testing-peer-dep-conflict-chain-m': '1',
-        }
+        },
       },
       error: true,
     },
@@ -1600,7 +1603,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-a': '1',
           '@isaacs/testing-peer-dep-conflict-chain-w': '2',
-        }
+        },
       },
       error: true,
     },
@@ -1609,7 +1612,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-j': '1',
           '@isaacs/testing-peer-dep-conflict-chain-v': '2',
-        }
+        },
       },
       error: false,
       resolvable: true,
@@ -1619,7 +1622,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-a': '2',
           '@isaacs/testing-peer-dep-conflict-chain-j': '1',
-        }
+        },
       },
       error: false,
       resolvable: true,
@@ -1628,9 +1631,9 @@ t.test('more peer dep conflicts', t => {
       pkg: {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-j': '1',
-        }
+        },
       },
-      add: [ '@isaacs/testing-peer-dep-conflict-chain-a@2' ],
+      add: ['@isaacs/testing-peer-dep-conflict-chain-a@2'],
       error: false,
       resolvable: true,
     },
@@ -1638,9 +1641,9 @@ t.test('more peer dep conflicts', t => {
       pkg: {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-j': '1',
-        }
+        },
       },
-      add: [ '@isaacs/testing-peer-dep-conflict-chain-v@2' ],
+      add: ['@isaacs/testing-peer-dep-conflict-chain-v@2'],
       error: false,
       resolvable: true,
     },
@@ -1649,7 +1652,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-ii': '1',
           '@isaacs/testing-peer-dep-conflict-chain-j': '2',
-        }
+        },
       },
       error: false,
       resolvable: true,
@@ -1659,7 +1662,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-i': '1',
           '@isaacs/testing-peer-dep-conflict-chain-jj': '2',
-        }
+        },
       },
       error: false,
       resolvable: true,
@@ -1669,7 +1672,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-jj': '1',
           '@isaacs/testing-peer-dep-conflict-chain-j': '2',
-        }
+        },
       },
       error: false,
       resolvable: true,
@@ -1679,7 +1682,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-j': '1',
           '@isaacs/testing-peer-dep-conflict-chain-jj': '2',
-        }
+        },
       },
       error: false,
       resolvable: true,
@@ -1688,7 +1691,7 @@ t.test('more peer dep conflicts', t => {
       pkg: {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-p': '1',
-        }
+        },
       },
       // XXX should this be false?  it's not OUR fault, after all?
       // but it is a conflict in a peerSet that the root is sourcing.
@@ -1698,7 +1701,7 @@ t.test('more peer dep conflicts', t => {
       pkg: {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-p': '2',
-        }
+        },
       },
       error: false,
     },
@@ -1717,7 +1720,7 @@ t.test('more peer dep conflicts', t => {
         dependencies: {
           '@isaacs/testing-peer-dep-conflict-chain-v': '1',
           '@isaacs/testing-peer-dep-conflict-chain-y': '2',
-        }
+        },
       },
       error: true,
       resolvable: false,
@@ -1803,3 +1806,311 @@ t.test('make sure yargs works', async t => {
   const yargs = resolve(fixtures, 'yargs')
   t.matchSnapshot(await printIdeal(yargs), 'yargs should build fine')
 })
+
+t.test('allow updating when peer outside of explicit update set', t => {
+  // see https://github.com/npm/cli/issues/2000
+  t.plan(2)
+  t.test('valid, no force required', async t => {
+    const path = t.testdir({
+      'package.json': JSON.stringify({
+        name: 'x',
+        version: '1.0.0',
+        dependencies: {
+          '@isaacs/testing-peer-dep-conflict-chain-a': '1',
+          '@isaacs/testing-peer-dep-conflict-chain-single-a': '^1.0.1',
+          '@isaacs/testing-peer-dep-conflict-chain-single-b': '^1.0.1',
+        },
+      }),
+      'package-lock.json': JSON.stringify({
+        name: 'x',
+        version: '1.0.0',
+        lockfileVersion: 2,
+        requires: true,
+        packages: {
+          '': {
+            dependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-a': '1',
+              '@isaacs/testing-peer-dep-conflict-chain-single-a': '^1.0.1',
+              '@isaacs/testing-peer-dep-conflict-chain-single-b': '^1.0.1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-a': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-a/-/testing-peer-dep-conflict-chain-a-1.0.0.tgz',
+            integrity: 'sha512-yUUG0Sem+AzNZ0uPXmEZN/GHHMmAg3kbM/zrijnd+tAAKVV5PhWXVUuLKJ3Q6wSAxz3WuYG08OaJl3lpV4UFOA==',
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-b': '1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-b': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-b/-/testing-peer-dep-conflict-chain-b-1.0.0.tgz',
+            integrity: 'sha512-tbsZ8No4L7h5YiIqDwGlJ14dg44oG4ZstF/wx7eZKUlnZax392thEeac5MNGFsv1T0Uqtiby9+SdpIRpejrHSw==',
+            peer: true,
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-c': '1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-c': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-c/-/testing-peer-dep-conflict-chain-c-1.0.0.tgz',
+            integrity: 'sha512-173OUwUJK8QN4CGTF+oPHwoOHbUzgxjC3tzg2kBVLE/eak02ZXJrW9l4LmW03vqcToADVhsVMcFLIaAb6yd1mQ==',
+            peer: true,
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-d': '1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-d': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-d/-/testing-peer-dep-conflict-chain-d-1.0.0.tgz',
+            integrity: 'sha512-zOtmaure/xJHmz7yGU7T33hjV6MZpo8Y6v1GuxDBx0PbqGoCxxCMacNtTUsEL5Sj8T19r5UShGZQmirNqPuhww==',
+            peer: true,
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-e': '1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-e': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-e/-/testing-peer-dep-conflict-chain-e-1.0.0.tgz',
+            integrity: 'sha512-EDuAVgd6DBGe2tKQKdQt7Z6RoptSWQem4W++F+bqC31E0JuRVJHu44sENtIviUGsi0jVJS5xD75cL6kvvbaw/Q==',
+            peer: true,
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-a': '1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a': {
+            version: '1.0.1',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-a/-/testing-peer-dep-conflict-chain-single-a-1.0.1.tgz',
+            integrity: 'sha512-NLHsR3z4e5I7+IXbe8l0SXDSdsghDtbsCMAG3deh21djZAH4dawx0bR/V/knYDrd0OZWdr0jDhivmVm42SmB1w==',
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-a': '1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b': {
+            version: '1.0.1',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-b/-/testing-peer-dep-conflict-chain-single-b-1.0.1.tgz',
+            integrity: 'sha512-cyXyBAMPJWv28bHI0cJrer64eqQsM59CR+/ideNwthD5X5hZVyvVMTpuai7noDA34jllf9Xgb+jcPgt2xmvR6A==',
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-a': '1',
+              '@isaacs/testing-peer-dep-conflict-chain-single-a': '1',
+            },
+          },
+        },
+        dependencies: {
+          '@isaacs/testing-peer-dep-conflict-chain-a': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-a/-/testing-peer-dep-conflict-chain-a-1.0.0.tgz',
+            integrity: 'sha512-yUUG0Sem+AzNZ0uPXmEZN/GHHMmAg3kbM/zrijnd+tAAKVV5PhWXVUuLKJ3Q6wSAxz3WuYG08OaJl3lpV4UFOA==',
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-b': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-b/-/testing-peer-dep-conflict-chain-b-1.0.0.tgz',
+            integrity: 'sha512-tbsZ8No4L7h5YiIqDwGlJ14dg44oG4ZstF/wx7eZKUlnZax392thEeac5MNGFsv1T0Uqtiby9+SdpIRpejrHSw==',
+            peer: true,
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-c': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-c/-/testing-peer-dep-conflict-chain-c-1.0.0.tgz',
+            integrity: 'sha512-173OUwUJK8QN4CGTF+oPHwoOHbUzgxjC3tzg2kBVLE/eak02ZXJrW9l4LmW03vqcToADVhsVMcFLIaAb6yd1mQ==',
+            peer: true,
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-d': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-d/-/testing-peer-dep-conflict-chain-d-1.0.0.tgz',
+            integrity: 'sha512-zOtmaure/xJHmz7yGU7T33hjV6MZpo8Y6v1GuxDBx0PbqGoCxxCMacNtTUsEL5Sj8T19r5UShGZQmirNqPuhww==',
+            peer: true,
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-e': {
+            version: '1.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-e/-/testing-peer-dep-conflict-chain-e-1.0.0.tgz',
+            integrity: 'sha512-EDuAVgd6DBGe2tKQKdQt7Z6RoptSWQem4W++F+bqC31E0JuRVJHu44sENtIviUGsi0jVJS5xD75cL6kvvbaw/Q==',
+            peer: true,
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-single-a': {
+            version: '1.0.1',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-a/-/testing-peer-dep-conflict-chain-single-a-1.0.1.tgz',
+            integrity: 'sha512-NLHsR3z4e5I7+IXbe8l0SXDSdsghDtbsCMAG3deh21djZAH4dawx0bR/V/knYDrd0OZWdr0jDhivmVm42SmB1w==',
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-single-b': {
+            version: '1.0.1',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-b/-/testing-peer-dep-conflict-chain-single-b-1.0.1.tgz',
+            integrity: 'sha512-cyXyBAMPJWv28bHI0cJrer64eqQsM59CR+/ideNwthD5X5hZVyvVMTpuai7noDA34jllf9Xgb+jcPgt2xmvR6A==',
+            requires: {},
+          },
+        },
+      }),
+    })
+    t.matchSnapshot(await printIdeal(path, {
+      add: [
+        '@isaacs/testing-peer-dep-conflict-chain-single-a@2',
+        '@isaacs/testing-peer-dep-conflict-chain-single-b@2',
+      ],
+    }))
+  })
+
+  t.test('conflict, but resolves appropriately with --force', async t => {
+    const path = t.testdir({
+      'package.json': JSON.stringify({
+        name: 'x',
+        version: '1.0.0',
+        dependencies: {
+          '@isaacs/testing-peer-dep-conflict-chain-a': '2',
+          '@isaacs/testing-peer-dep-conflict-chain-single-a': '^1.0.1',
+          '@isaacs/testing-peer-dep-conflict-chain-single-b': '^1.0.1',
+        },
+      }),
+      'package-lock.json': JSON.stringify({
+        name: 'x',
+        lockfileVersion: 2,
+        requires: true,
+        packages: {
+          '': {
+            dependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-a': '2',
+              '@isaacs/testing-peer-dep-conflict-chain-single-a': '^1.0.1',
+              '@isaacs/testing-peer-dep-conflict-chain-single-b': '^1.0.1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-a': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-a/-/testing-peer-dep-conflict-chain-a-2.0.0.tgz',
+            integrity: 'sha512-B1L3NDBf8/nZSDM+E0AmotxaSGi5e/EUPRpoGLS0nAqulv3itMULe7s4VREyuS195j4JlhJEaz9C8idB9mA8Bw==',
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-b': '2',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-b': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-b/-/testing-peer-dep-conflict-chain-b-2.0.0.tgz',
+            integrity: 'sha512-6Lh4Gj5Nl5i+IhYxCjBmD5acTRkSni5m/wjXZCVaj0xJUVaNO+MprVlktUc0w1WN8E6CM4yhrkVdFTMDxBIZ0Q==',
+            peer: true,
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-c': '2',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-c': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-c/-/testing-peer-dep-conflict-chain-c-2.0.0.tgz',
+            integrity: 'sha512-iRawfr15PBTW8PHYySyCF/DvgNuEy8hCZQfWkLrdfiQvJfbMWsbSLAdX2HBT2hh0pefc0v+vBKpuhPi/jy6pvQ==',
+            peer: true,
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-d': '2',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-d': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-d/-/testing-peer-dep-conflict-chain-d-2.0.0.tgz',
+            integrity: 'sha512-zDS6IzO10KmLdtrG1m8M5wZ8wzmHPWaUBc4QaqptvI/nhLrgcH8OZB0hoMmK8tQg4MalbOyam4EdKOg7u9kGGg==',
+            peer: true,
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-e': '2',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-e': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-e/-/testing-peer-dep-conflict-chain-e-2.0.0.tgz',
+            integrity: 'sha512-HEcKq/WWndty//qXYNL9TxDve0FAJqSPAAFU7t6Hm5AtluOGmIPiGUf7Ei9HGe60iBrrfmnzSxfFRG7j0SbW9Q==',
+            peer: true,
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-a': '2',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-single-a': {
+            version: '1.0.1',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-a/-/testing-peer-dep-conflict-chain-single-a-1.0.1.tgz',
+            integrity: 'sha512-NLHsR3z4e5I7+IXbe8l0SXDSdsghDtbsCMAG3deh21djZAH4dawx0bR/V/knYDrd0OZWdr0jDhivmVm42SmB1w==',
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-a': '1',
+            },
+          },
+          'node_modules/@isaacs/testing-peer-dep-conflict-chain-single-b': {
+            version: '1.0.1',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-b/-/testing-peer-dep-conflict-chain-single-b-1.0.1.tgz',
+            integrity: 'sha512-cyXyBAMPJWv28bHI0cJrer64eqQsM59CR+/ideNwthD5X5hZVyvVMTpuai7noDA34jllf9Xgb+jcPgt2xmvR6A==',
+            peerDependencies: {
+              '@isaacs/testing-peer-dep-conflict-chain-a': '1',
+              '@isaacs/testing-peer-dep-conflict-chain-single-a': '1',
+            },
+          },
+        },
+        dependencies: {
+          '@isaacs/testing-peer-dep-conflict-chain-a': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-a/-/testing-peer-dep-conflict-chain-a-2.0.0.tgz',
+            integrity: 'sha512-B1L3NDBf8/nZSDM+E0AmotxaSGi5e/EUPRpoGLS0nAqulv3itMULe7s4VREyuS195j4JlhJEaz9C8idB9mA8Bw==',
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-b': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-b/-/testing-peer-dep-conflict-chain-b-2.0.0.tgz',
+            integrity: 'sha512-6Lh4Gj5Nl5i+IhYxCjBmD5acTRkSni5m/wjXZCVaj0xJUVaNO+MprVlktUc0w1WN8E6CM4yhrkVdFTMDxBIZ0Q==',
+            peer: true,
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-c': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-c/-/testing-peer-dep-conflict-chain-c-2.0.0.tgz',
+            integrity: 'sha512-iRawfr15PBTW8PHYySyCF/DvgNuEy8hCZQfWkLrdfiQvJfbMWsbSLAdX2HBT2hh0pefc0v+vBKpuhPi/jy6pvQ==',
+            peer: true,
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-d': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-d/-/testing-peer-dep-conflict-chain-d-2.0.0.tgz',
+            integrity: 'sha512-zDS6IzO10KmLdtrG1m8M5wZ8wzmHPWaUBc4QaqptvI/nhLrgcH8OZB0hoMmK8tQg4MalbOyam4EdKOg7u9kGGg==',
+            peer: true,
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-e': {
+            version: '2.0.0',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-e/-/testing-peer-dep-conflict-chain-e-2.0.0.tgz',
+            integrity: 'sha512-HEcKq/WWndty//qXYNL9TxDve0FAJqSPAAFU7t6Hm5AtluOGmIPiGUf7Ei9HGe60iBrrfmnzSxfFRG7j0SbW9Q==',
+            peer: true,
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-single-a': {
+            version: '1.0.1',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-a/-/testing-peer-dep-conflict-chain-single-a-1.0.1.tgz',
+            integrity: 'sha512-NLHsR3z4e5I7+IXbe8l0SXDSdsghDtbsCMAG3deh21djZAH4dawx0bR/V/knYDrd0OZWdr0jDhivmVm42SmB1w==',
+            requires: {},
+          },
+          '@isaacs/testing-peer-dep-conflict-chain-single-b': {
+            version: '1.0.1',
+            resolved: 'https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-b/-/testing-peer-dep-conflict-chain-single-b-1.0.1.tgz',
+            integrity: 'sha512-cyXyBAMPJWv28bHI0cJrer64eqQsM59CR+/ideNwthD5X5hZVyvVMTpuai7noDA34jllf9Xgb+jcPgt2xmvR6A==',
+            requires: {},
+          },
+        },
+      }),
+    })
+    t.matchSnapshot(await printIdeal(path, {
+      force: true,
+      add: [
+        '@isaacs/testing-peer-dep-conflict-chain-single-a@2',
+        '@isaacs/testing-peer-dep-conflict-chain-single-b@2',
+      ],
+    }), 'succeed if force applied')
+    await t.rejects(printIdeal(path, {
+      add: [
+        '@isaacs/testing-peer-dep-conflict-chain-single-a@2',
+        '@isaacs/testing-peer-dep-conflict-chain-single-b@2',
+      ],
+    }), 'fail without force')
+  })
+})
+
+t.test('carbonium eslint conflicts', async t => {
+  const path = resolve(fixtures, 'carbonium')
+  t.matchSnapshot(await printIdeal(path, {
+    add: [
+      '@typescript-eslint/eslint-plugin@4',
+      '@typescript-eslint/parser@4',
+    ],
+  }))
+})
diff --git a/test/fixtures/registry-mocks/content/isaacs/testing-peer-dep-conflict-chain-single-a.json b/test/fixtures/registry-mocks/content/isaacs/testing-peer-dep-conflict-chain-single-a.json
new file mode 100644
index 000000000..70f40b234
--- /dev/null
+++ b/test/fixtures/registry-mocks/content/isaacs/testing-peer-dep-conflict-chain-single-a.json
@@ -0,0 +1,156 @@
+{
+  "_id": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+  "_rev": "3-16d781dc4cbf40eb280424273cb80df1",
+  "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+  "dist-tags": {
+    "latest": "2.0.1"
+  },
+  "versions": {
+    "1.0.0": {
+      "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+      "version": "1.0.0",
+      "_id": "@isaacs/testing-peer-dep-conflict-chain-single-a@1.0.0",
+      "_nodeVersion": "14.8.0",
+      "_npmVersion": "7.0.3",
+      "dist": {
+        "integrity": "sha512-uTqVWww15QTQWHTmooaS0gaYmvUnznvKa+YiUgZw5tq8hXQHrP1O5NkjUDgHPqFBnbMNg5WTOQnnnI9gJPF3Vw==",
+        "shasum": "1141bc853b3bdc36e4b2309b0136120e79355125",
+        "tarball": "https://registry.npmjs.org/@isaacs/testing-peer-dep-conflict-chain-single-a/-/testing-peer-dep-conflict-chain-single-a-1.0.0.tgz",
+        "fileCount": 1,
+        "unpackedSize": 87,
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diff --git a/test/fixtures/registry-mocks/content/isaacs/testing-peer-dep-conflict-chain-single-a.min.json b/test/fixtures/registry-mocks/content/isaacs/testing-peer-dep-conflict-chain-single-a.min.json
new file mode 100644
index 000000000..1c2daaba4
--- /dev/null
+++ b/test/fixtures/registry-mocks/content/isaacs/testing-peer-dep-conflict-chain-single-a.min.json
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diff --git a/test/fixtures/registry-mocks/content/isaacs/testing-peer-dep-conflict-chain-single-b.min.json b/test/fixtures/registry-mocks/content/isaacs/testing-peer-dep-conflict-chain-single-b.min.json
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+}
diff --git a/test/fixtures/testing-peer-dep-conflict-chain/single-a/1/package.json b/test/fixtures/testing-peer-dep-conflict-chain/single-a/1/package.json
new file mode 100644
index 000000000..9ce5ff26f
--- /dev/null
+++ b/test/fixtures/testing-peer-dep-conflict-chain/single-a/1/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+  "version": "1.0.1",
+  "peerDependencies": {
+    "@isaacs/testing-peer-dep-conflict-chain-a": "1"
+  }
+}
diff --git a/test/fixtures/testing-peer-dep-conflict-chain/single-a/2/package.json b/test/fixtures/testing-peer-dep-conflict-chain/single-a/2/package.json
new file mode 100644
index 000000000..7fdd1201e
--- /dev/null
+++ b/test/fixtures/testing-peer-dep-conflict-chain/single-a/2/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "@isaacs/testing-peer-dep-conflict-chain-single-a",
+  "version": "2.0.1",
+  "peerDependencies": {
+    "@isaacs/testing-peer-dep-conflict-chain-a": "1"
+  }
+}
diff --git a/test/fixtures/testing-peer-dep-conflict-chain/single-b/1/package.json b/test/fixtures/testing-peer-dep-conflict-chain/single-b/1/package.json
new file mode 100644
index 000000000..aa2fac1f5
--- /dev/null
+++ b/test/fixtures/testing-peer-dep-conflict-chain/single-b/1/package.json
@@ -0,0 +1,8 @@
+{
+  "name": "@isaacs/testing-peer-dep-conflict-chain-single-b",
+  "version": "1.0.1",
+  "peerDependencies": {
+    "@isaacs/testing-peer-dep-conflict-chain-single-a": "1",
+    "@isaacs/testing-peer-dep-conflict-chain-a": "1"
+  }
+}
diff --git a/test/fixtures/testing-peer-dep-conflict-chain/single-b/2/package.json b/test/fixtures/testing-peer-dep-conflict-chain/single-b/2/package.json
new file mode 100644
index 000000000..e85fd3587
--- /dev/null
+++ b/test/fixtures/testing-peer-dep-conflict-chain/single-b/2/package.json
@@ -0,0 +1,8 @@
+{
+  "name": "@isaacs/testing-peer-dep-conflict-chain-single-b",
+  "version": "2.0.1",
+  "peerDependencies": {
+    "@isaacs/testing-peer-dep-conflict-chain-single-a": "2",
+    "@isaacs/testing-peer-dep-conflict-chain-a": "1"
+  }
+}