import.meta.resolve support (#14930)

Co-authored-by: Simen Bekkhus <[email protected]>

CHANGELOG.md

@@ -21,6 +21,7 @@
 - `[jest-mock]` Add support for the Explicit Resource Management proposal to use the `using` keyword with `jest.spyOn(object, methodName)` ([#14895](https://github.com/jestjs/jest/pull/14895))
 - `[jest-runtime]` Exposing new modern timers function `jest.advanceTimersToFrame()` from `@jest/fake-timers` ([#14598](https://github.com/jestjs/jest/pull/14598))
 - `[jest-runtime]` Support `import.meta.filename` and `import.meta.dirname` (available from [Node 20.11](https://nodejs.org/en/blog/release/v20.11.0)) ([#14854](https://github.com/jestjs/jest/pull/14854))
+- `[jest-runtime]` Support `import.meta.resolve` ([#14930](https://github.com/jestjs/jest/pull/14930))
 - `[@jest/schemas]` Upgrade `@sinclair/typebox` to v0.31 ([#14072](https://github.com/jestjs/jest/pull/14072))
 - `[@jest/types]` `test.each()`: Accept a readonly (`as const`) table properly ([#14565](https://github.com/jestjs/jest/pull/14565))
 - `[jest-snapshot]` [**BREAKING**] Add support for [Error causes](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error/cause) in snapshots ([#13965](https://github.com/facebook/jest/pull/13965))

e2e/native-esm/__tests__/native-esm.test.js

@@ -31,6 +31,7 @@ test('should have correct import.meta', () => {
     dirname: expect.any(String),
     filename: expect.any(String),
     jest: expect.anything(),
+    resolve: expect.any(Function),
     url: expect.any(String),
   });
   expect(import.meta.jest).toBe(jestObject);
@@ -56,6 +57,16 @@ test('should have correct import.meta', () => {
       true,
     );
   }
+  expect(
+    import.meta
+      .resolve('colors')
+      .endsWith('jest/e2e/native-esm/node_modules/colors/lib/index.js'),
+  ).toBe(true);
+  expect(
+    import.meta
+      .resolve('./native-esm.test')
+      .endsWith('jest/e2e/native-esm/__tests__/native-esm.test.js'),
+  ).toBe(true);
 });
 
 test('should double stuff', () => {
@@ -68,6 +79,7 @@ test('should support importing node core modules', () => {
 
   expect(JSON.parse(readFileSync(packageJsonPath, 'utf8'))).toEqual({
     devDependencies: {
+      colors: '^1.4.0',
       'discord.js': '14.3.0',
       'iso-constants': '^0.1.2',
       yargs: '^17.5.1',

e2e/native-esm/package.json

@@ -4,6 +4,7 @@
     "isolated-vm": "^4.6.0"
   },
   "devDependencies": {
+    "colors": "^1.4.0",
     "discord.js": "14.3.0",
     "iso-constants": "^0.1.2",
     "yargs": "^17.5.1"

e2e/native-esm/yarn.lock

@@ -333,6 +333,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"colors@npm:^1.4.0":
+  version: 1.4.0
+  resolution: "colors@npm:1.4.0"
+  checksum: 98aa2c2418ad87dedf25d781be69dc5fc5908e279d9d30c34d8b702e586a0474605b3a189511482b9d5ed0d20c867515d22749537f7bc546256c6014f3ebdcec
+  languageName: node
+  linkType: hard
+
 "cross-spawn@npm:^7.0.0":
   version: 7.0.3
   resolution: "cross-spawn@npm:7.0.3"
@@ -1087,6 +1094,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
+    colors: ^1.4.0
     discord.js: 14.3.0
     iso-constants: ^0.1.2
     isolated-vm: ^4.6.0

packages/jest-runtime/src/index.ts

@@ -518,12 +518,26 @@ export default class Runtime {
               return this.linkAndEvaluateModule(module);
             },
             initializeImportMeta: (meta: JestImportMeta) => {
-              meta.url = pathToFileURL(modulePath).href;
+              const metaUrl = pathToFileURL(modulePath).href;
+              meta.url = metaUrl;
 
               // @ts-expect-error Jest uses @types/node@16. Will be fixed when updated to @types/[email protected]
-              meta.filename = fileURLToPath(meta.url);
+              meta.filename = modulePath;
               // @ts-expect-error Jest uses @types/node@16. Will be fixed when updated to @types/[email protected]
-              meta.dirname = path.dirname(meta.filename);
+              meta.dirname = path.dirname(modulePath);
+
+              // @ts-expect-error It should not be async. Will be fixed when updated to @types/[email protected]
+              meta.resolve = (specifier, parent = metaUrl) => {
+                const parentPath = fileURLToPath(parent);
+
+                const resolvedPath = this._resolver.resolveModule(
+                  parentPath,
+                  specifier,
+                  {conditions: this.esmConditions},
+                );
+
+                return pathToFileURL(resolvedPath).href;
+              };
 
               let jest = this.jestObjectCaches.get(modulePath);
 
@@ -1466,28 +1480,25 @@ export default class Runtime {
       if (module) {
         return module;
       }
-    } else {
-      const {paths} = options;
-      if (paths) {
-        for (const p of paths) {
-          const absolutePath = path.resolve(from, '..', p);
-          const module = this._resolver.resolveModuleFromDirIfExists(
-            absolutePath,
-            moduleName,
-            // required to also resolve files without leading './' directly in the path
-            {conditions: this.cjsConditions, paths: [absolutePath]},
-          );
-          if (module) {
-            return module;
-          }
-        }
-
-        throw new Resolver.ModuleNotFoundError(
-          `Cannot resolve module '${moduleName}' from paths ['${paths.join(
-            "', '",
-          )}'] from ${from}`,
+    } else if (options.paths) {
+      for (const p of options.paths) {
+        const absolutePath = path.resolve(from, '..', p);
+        const module = this._resolver.resolveModuleFromDirIfExists(
+          absolutePath,
+          moduleName,
+          // required to also resolve files without leading './' directly in the path
+          {conditions: this.cjsConditions, paths: [absolutePath]},
         );
+        if (module) {
+          return module;
+        }
       }
+
+      throw new Resolver.ModuleNotFoundError(
+        `Cannot resolve module '${moduleName}' from paths ['${options.paths.join(
+          "', '",
+        )}'] from ${from}`,
+      );
     }
 
     try {