diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..c50e7cf
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,56 @@
+name: ci
+
+on:
+  - push
+  - pull_request
+
+jobs:
+
+  build:
+    name: Continuous integration (build)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v3
+
+      - name: Install 📦
+        uses: bahmutov/npm-install@v1
+        with:
+          install-command: yarn --frozen-lockfile --ignore-scripts
+          useRollingCache: true
+
+      - name: Build 🏗️
+        run: yarn build
+
+      - name: Archive build 💽
+        uses: actions/upload-artifact@v2
+        with:
+          name: dist
+          path: dist
+          retention-days: 1
+
+  test:
+    needs: ["build"]
+    name: Continuous integration (tests)
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        bundle: ["modern", "module", "cjs"]
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v3
+
+      - name: Install 📦
+        uses: bahmutov/npm-install@v1
+        with:
+          install-command: yarn --frozen-lockfile --ignore-scripts
+          useRollingCache: true
+
+      - name: Load build 💽
+        uses: actions/download-artifact@v2
+        with:
+          name: dist
+          path: dist
+
+      - name: Test 🔬
+        run: yarn test:${{ matrix.bundle }}
diff --git a/.github/workflows/ci:test.yml b/.github/workflows/ci:cover.yml
similarity index 71%
rename from .github/workflows/ci:test.yml
rename to .github/workflows/ci:cover.yml
index 03f7739..8364e23 100644
--- a/.github/workflows/ci:test.yml
+++ b/.github/workflows/ci:cover.yml
@@ -1,23 +1,23 @@
-name: ci:test
+name: ci:cover
 on:
   - push
   - pull_request
 jobs:
-  test:
-    name: Continuous integration (tests)
+  cover:
+    name: Continuous integration (code coverage)
     runs-on: ubuntu-latest
     steps:
       - name: Checkout 🛎️
         uses: actions/checkout@v3
 
-      - name: Install 🔧
+      - name: Install 📦
         uses: bahmutov/npm-install@v1
         with:
           install-command: yarn --frozen-lockfile --ignore-scripts
           useRollingCache: true
 
-      - name: Test 🔬
-        run: yarn ci:test
+      - name: Test and record coverage 🔬
+        run: yarn cover
 
       - name: Publish coverage report 📃
         uses: codecov/codecov-action@v2
diff --git a/.github/workflows/ci:lint-config.yml b/.github/workflows/ci:lint-config.yml
new file mode 100644
index 0000000..bdd3853
--- /dev/null
+++ b/.github/workflows/ci:lint-config.yml
@@ -0,0 +1,20 @@
+name: ci:lint-config
+on:
+  - push
+  - pull_request
+jobs:
+  cover:
+    name: Continuous integration (config linting)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v3
+
+      - name: Install 📦
+        uses: bahmutov/npm-install@v1
+        with:
+          install-command: yarn --frozen-lockfile --ignore-scripts
+          useRollingCache: true
+
+      - name: Lint config 👕
+        run: yarn lint-config
diff --git a/.github/workflows/ci:build.yml b/.github/workflows/ci:lint.yml
similarity index 66%
rename from .github/workflows/ci:build.yml
rename to .github/workflows/ci:lint.yml
index ee3a57c..7e0551c 100644
--- a/.github/workflows/ci:build.yml
+++ b/.github/workflows/ci:lint.yml
@@ -1,20 +1,20 @@
-name: ci:build
+name: ci:lint
 on:
   - push
   - pull_request
 jobs:
-  test:
-    name: Continuous integration (build)
+  cover:
+    name: Continuous integration (code linting)
     runs-on: ubuntu-latest
     steps:
       - name: Checkout 🛎️
         uses: actions/checkout@v3
 
-      - name: Install 🔧
+      - name: Install 📦
         uses: bahmutov/npm-install@v1
         with:
           install-command: yarn --frozen-lockfile --ignore-scripts
           useRollingCache: true
 
-      - name: Build 🏗️
-        run: yarn ci:build
+      - name: Lint 👕
+        run: yarn lint
diff --git a/README.md b/README.md
index b1be547..9afd511 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ U.find( a ) === U.find( b ) ; // true
 
 [![License](https://img.shields.io/github/license/union-find/contiguous.svg)](https://raw.githubusercontent.com/union-find/contiguous/main/LICENSE)
 [![Version](https://img.shields.io/npm/v/@union-find/contiguous.svg)](https://www.npmjs.org/package/@union-find/contiguous)
-[![Tests](https://img.shields.io/github/workflow/status/union-find/contiguous/ci:test?event=push&label=tests)](https://github.com/union-find/contiguous/actions/workflows/ci:test.yml?query=branch:main)
+[![Tests](https://img.shields.io/github/workflow/status/union-find/contiguous/ci?event=push&label=tests)](https://github.com/union-find/contiguous/actions/workflows/ci.yml?query=branch:main)
 [![Dependencies](https://img.shields.io/librariesio/github/union-find/contiguous.svg)](https://github.com/union-find/contiguous/network/dependencies)
 [![GitHub issues](https://img.shields.io/github/issues/union-find/contiguous.svg)](https://github.com/union-find/contiguous/issues)
 [![Downloads](https://img.shields.io/npm/dm/@union-find/contiguous.svg)](https://www.npmjs.org/package/@union-find/contiguous)
diff --git a/package.json b/package.json
index 516910f..bc44892 100644
--- a/package.json
+++ b/package.json
@@ -50,8 +50,6 @@
     "build": "NODE_ENV=production microbundle",
     "build-docs": "esdoc",
     "build-gh-pages": "npm run build-docs",
-    "ci:build": "npm run build",
-    "ci:test": "npm run lint-config && npm run lint && npm run cover",
     "commit-msg": "commitlint --edit",
     "cover": "NODE_ENV=cover c8 --all --src src --reporter lcov --reporter text-summary --reporter text npm test",
     "debug": "NODE_ENV=debug npm run test -- -st --fail-fast",
@@ -67,7 +65,13 @@
     "prepare": "npm run build",
     "prepublishOnly": "pinst --disable",
     "release": "np --message ':hatching_chick: release: Bumping to v%s.'",
-    "test": "ava"
+    "test": "npm run test:src",
+    "test-cmd": "NODE_LOADER_CONFIG=test/loader/config.js ava",
+    "test:cjs": "IMPORT_MAP_PATH=test/import-maps/dist/index.json npm run test-cmd",
+    "test:dist": "npm run test:modern && npm run test:module && npm run test:cjs",
+    "test:modern": "IMPORT_MAP_PATH=test/import-maps/dist/index.modern.json npm run test-cmd",
+    "test:module": "IMPORT_MAP_PATH=test/import-maps/dist/index.module.json npm run test-cmd",
+    "test:src": "IMPORT_MAP_PATH=test/import-maps/src/index.json npm run test-cmd"
   },
   "dependencies": {},
   "devDependencies": {
@@ -77,6 +81,8 @@
     "@commitlint/cli": "17.1.2",
     "@js-library/commitlint-config": "0.0.4",
     "@node-loader/babel": "2.0.1",
+    "@node-loader/core": "2.0.0",
+    "@node-loader/import-maps": "1.1.0",
     "ava": "4.3.3",
     "babel-plugin-transform-remove-console": "6.9.4",
     "babel-plugin-unassert": "3.2.0",
@@ -100,14 +106,14 @@
     "files": [
       "test/src/**/*"
     ],
-    "nodeArguments": [
-      "--experimental-loader=@node-loader/babel"
-    ],
     "require": [
       "regenerator-runtime/runtime"
     ],
     "timeout": "1m",
-    "concurrency": 8
+    "concurrency": 8,
+    "nodeArguments": [
+      "--experimental-loader=@node-loader/core"
+    ]
   },
   "babel": {
     "sourceMaps": true,
diff --git a/test/import-maps/dist/index.json b/test/import-maps/dist/index.json
new file mode 100644
index 0000000..7059eb6
--- /dev/null
+++ b/test/import-maps/dist/index.json
@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "#module": "./dist/index.cjs"
+  }
+}
diff --git a/test/import-maps/dist/index.modern.json b/test/import-maps/dist/index.modern.json
new file mode 100644
index 0000000..8eafb2e
--- /dev/null
+++ b/test/import-maps/dist/index.modern.json
@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "#module": "./dist/index.modern.js"
+  }
+}
diff --git a/test/import-maps/dist/index.module.json b/test/import-maps/dist/index.module.json
new file mode 100644
index 0000000..74c8d44
--- /dev/null
+++ b/test/import-maps/dist/index.module.json
@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "#module": "./dist/index.module.js"
+  }
+}
diff --git a/test/import-maps/src/index.json b/test/import-maps/src/index.json
new file mode 100644
index 0000000..6b576f1
--- /dev/null
+++ b/test/import-maps/src/index.json
@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "#module": "./src/index.js"
+  }
+}
diff --git a/test/loader/config.js b/test/loader/config.js
new file mode 100644
index 0000000..e08c360
--- /dev/null
+++ b/test/loader/config.js
@@ -0,0 +1,8 @@
+import * as importMapLoader from '@node-loader/import-maps';
+import * as babelLoader from '@node-loader/babel';
+
+const config = {
+	loaders: [importMapLoader, babelLoader],
+};
+
+export default config;
diff --git a/test/src/disjointset.js b/test/src/disjointset.js
index 7833a2c..b3de332 100644
--- a/test/src/disjointset.js
+++ b/test/src/disjointset.js
@@ -9,7 +9,7 @@ import {
 	ForestAmortizedTwoPasses,
 	ForestAmortizedSplitting,
 	ForestAmortizedHalving,
-} from '../../src/index.js';
+} from '#module';
 
 function macro(t, Universe) {
 	/* eslint-disable no-multi-assign */
diff --git a/yarn.lock b/yarn.lock
index 727e616..b0d4b34 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1264,6 +1264,16 @@
   resolved "https://registry.yarnpkg.com/@node-loader/babel/-/babel-2.0.1.tgz#a04d7535b5ade12e3987de04fc5ffe204f26c64c"
   integrity sha512-lulESaNn+jyn4lCbfcFWFcRYchsL0jY8q/mf5XRKOiX2uTpkXE3fGAlZ4+wyP/hIAMSlDPuHIUkRSTkJZ6SQyA==
 
+"@node-loader/core@2.0.0":
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/@node-loader/core/-/core-2.0.0.tgz#7f5a3a91fe137c8e71c0813f3bbaa0ee136a1308"
+  integrity sha512-7wV4qj2/tROXGgoYWmNvObUXbXqSv1yUD31K79Jt1q7NDuqrLz4WjjW+wVoCNgVcl8+YSj9BvLX8KsB/SrSzuw==
+
+"@node-loader/import-maps@1.1.0":
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/@node-loader/import-maps/-/import-maps-1.1.0.tgz#4785fdce3bc973c5b53a4549248ab42b370ecda9"
+  integrity sha512-RPB+7vBVhk9xF/eiSGSxEnL6hGQ0a1ua9hvl/MxXDmu7F+Nv+gMwA7AJ0S5TmcgulHAp9/IxobGoFiOxkX7xWQ==
+
 "@nodelib/fs.scandir@2.1.5":
   version "2.1.5"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz#7619c2eb21b25483f6d167548b4cfd5a7488c3d5"