fix buildtools weird bug with "extends", #1463

tsconfig/buildtools/tsconfig.json

@@ -1,4 +1,24 @@
+
+// TODO: Ideally, the contents here would be an extends, but typescript really doesn't want me to do that. https://github.com/phetsims/chipper/issues/1463
+//{
+//  // Chipper and its node dependencies is what we call "buildtools"
+//  "extends": "../../../chipper/tsconfig-node.json"
+//}
 {
-  // Chipper and its node dependencies is what we call "buildtools"
-  "extends": "../../../chipper/tsconfig-node.json"
+  "extends": "../../tsconfig/shared/tsconfig-node.json",
+  "include": [
+    "../../js/common/**/*",
+    "../../js/grunt/**/*",
+    "../../js/phet-io/**/*",
+    "../../js/scripts/**/*",
+    "../../test/**/*",
+    "../../eslint/**/*",
+    // Gruntfile and eslint.config.mjs
+    "../../*"
+  ],
+  "references": [
+    {
+      "path": "../../../perennial-alias/tsconfig-chipper.json"
+    }
+  ]
 }