fix: resolve module system upwards from resource path

client/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}

loader/utils/getModuleSystem.js

@@ -1,5 +1,7 @@
 const { promises: fsPromises } = require('fs');
 const path = require('path');
+const commonPathPrefix = require('common-path-prefix');
+const findUp = require('find-up');
 
 /** @type {string | undefined} */
 let packageJsonType;
@@ -45,7 +47,17 @@ async function getModuleSystem(ModuleFilenameHelpers, options) {
   // We will cache the results in a global variable so it will only be parsed once.
   if (!packageJsonType) {
     try {
-      const packageJsonPath = require.resolve(path.join(this.rootContext, 'package.json'));
+      const commonPath = commonPathPrefix([this.rootContext, this.resourcePath], '/');
+      const stopPath = path.resolve(commonPath, '..');
+
+      const packageJsonPath = await findUp(
+        (dir) => {
+          if (dir === stopPath) return findUp.stop;
+          return 'package.json';
+        },
+        { cwd: path.dirname(this.resourcePath) }
+      );
+
       const buffer = await fsPromises.readFile(packageJsonPath, { encoding: 'utf-8' });
       const rawPackageJson = buffer.toString('utf-8');
       ({ type: packageJsonType } = JSON.parse(rawPackageJson));

overlay/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}

package.json

@@ -56,8 +56,10 @@
   },
   "dependencies": {
     "ansi-html": "^0.0.7",
+    "common-path-prefix": "^3.0.0",
     "core-js-pure": "^3.8.1",
     "error-stack-parser": "^2.0.6",
+    "find-up": "^5.0.0",
     "html-entities": "^2.1.0",
     "loader-utils": "^2.0.0",
     "schema-utils": "^3.0.0",

sockets/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}

test/loader/unit/getModuleSystem.test.js

@@ -62,7 +62,7 @@ describe('getModuleSystem', () => {
     await expect(
       getModuleSystem.call(
         {
-          resourcePath: 'index.js',
+          resourcePath: path.resolve(__dirname, '..', 'fixtures/esm', 'index.js'),
           rootContext: path.resolve(__dirname, '..', 'fixtures/esm'),
         },
         ModuleFilenameHelpers,
@@ -75,7 +75,7 @@ describe('getModuleSystem', () => {
     await expect(
       getModuleSystem.call(
         {
-          resourcePath: 'index.js',
+          resourcePath: path.resolve(__dirname, '..', 'fixtures/cjs', 'index.js'),
           rootContext: path.resolve(__dirname, '..', 'fixtures/cjs'),
         },
         ModuleFilenameHelpers,
@@ -88,7 +88,7 @@ describe('getModuleSystem', () => {
     await expect(
       getModuleSystem.call(
         {
-          resourcePath: 'index.js',
+          resourcePath: path.resolve(__dirname, '..', 'fixtures/auto', 'index.js'),
           rootContext: path.resolve(__dirname, '..', 'fixtures/auto'),
         },
         ModuleFilenameHelpers,

yarn.lock

@@ -2006,6 +2006,11 @@ commander@^7.0.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-7.2.0.tgz#a36cb57d0b501ce108e4d20559a150a391d97ab7"
   integrity sha512-QrWXB+ZQSVPmIWIhtEO9H+gwHaMGYiF5ChvoJ+K9ZGHG/sVsa6yiesAD1GC/x46sET00Xlwo1u49RVVVzvcSkw==
 
+common-path-prefix@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/common-path-prefix/-/common-path-prefix-3.0.0.tgz#7d007a7e07c58c4b4d5f433131a19141b29f11e0"
+  integrity sha512-QE33hToZseCH3jS0qN96O/bSh3kaw/h+Tq7ngyY9eWDUnTlTNUyqfqvCXioLe5Na5jFsL78ra/wuBU4iuEgd4w==
+
 commondir@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/commondir/-/commondir-1.0.1.tgz#ddd800da0c66127393cca5950ea968a3aaf1253b"
@@ -3167,6 +3172,14 @@ find-up@^4.0.0, find-up@^4.1.0:
     locate-path "^5.0.0"
     path-exists "^4.0.0"
 
+find-up@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/find-up/-/find-up-5.0.0.tgz#4c92819ecb7083561e4f4a240a86be5198f536fc"
+  integrity sha512-78/PXT1wlLLDgTzDs7sjq9hzz0vXD+zn+7wypEe4fXQxCmdmqfGsEPQxmiCSQI3ajFV91bVSsvNtrJRiW6nGng==
+  dependencies:
+    locate-path "^6.0.0"
+    path-exists "^4.0.0"
+
 findup-sync@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/findup-sync/-/findup-sync-3.0.0.tgz#17b108f9ee512dfb7a5c7f3c8b27ea9e1a9c08d1"
@@ -5058,6 +5071,13 @@ locate-path@^5.0.0:
   dependencies:
     p-locate "^4.1.0"
 
+locate-path@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-6.0.0.tgz#55321eb309febbc59c4801d931a72452a681d286"
+  integrity sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==
+  dependencies:
+    p-locate "^5.0.0"
+
 lodash._reinterpolate@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/lodash._reinterpolate/-/lodash._reinterpolate-3.0.0.tgz#0ccf2d89166af03b3663c796538b75ac6e114d9d"
@@ -5783,7 +5803,7 @@ p-limit@^2.0.0, p-limit@^2.2.0:
   dependencies:
     p-try "^2.0.0"
 
-p-limit@^3.1.0:
+p-limit@^3.0.2, p-limit@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-3.1.0.tgz#e1daccbe78d0d1388ca18c64fea38e3e57e3706b"
   integrity sha512-TYOanM3wGwNGsZN2cVTYPArw454xnXj5qmWF1bEoAc4+cU/ol7GVh7odevjp1FNHduHc3KZMcFduxU5Xc6uJRQ==
@@ -5804,6 +5824,13 @@ p-locate@^4.1.0:
   dependencies:
     p-limit "^2.2.0"
 
+p-locate@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-5.0.0.tgz#83c8315c6785005e3bd021839411c9e110e6d834"
+  integrity sha512-LaNjtRWUBY++zB5nE/NwcaoMylSPk+S+ZHNB1TzdbMJMny6dynpAGt7X/tl/QYq3TIeE6nxHppbo2LGymrG5Pw==
+  dependencies:
+    p-limit "^3.0.2"
+
 p-map@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/p-map/-/p-map-2.1.0.tgz#310928feef9c9ecc65b68b17693018a665cea175"