feat: support import.meta.dirname and import.meta.filename (#14854)

Author: alesmenzel

CHANGELOG.md

@@ -18,6 +18,7 @@
 - `[@jest/fake-timers]` [**BREAKING**] Upgrade `@sinonjs/fake-timers` to v11 ([#14544](https://github.com/jestjs/jest/pull/14544))
 - `[@jest/fake-timers]` Exposing new modern timers function `advanceTimersToFrame()` which advances all timers by the needed milliseconds to execute callbacks currently scheduled with `requestAnimationFrame` ([#14598](https://github.com/jestjs/jest/pull/14598))
 - `[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))
 - `[@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

@@ -28,13 +28,34 @@ test('should have correct import.meta', () => {
   expect(typeof require).toBe('undefined');
   expect(typeof jest).toBe('undefined');
   expect(import.meta).toEqual({
+    dirname: expect.any(String),
+    filename: expect.any(String),
     jest: expect.anything(),
     url: expect.any(String),
   });
   expect(import.meta.jest).toBe(jestObject);
   expect(
     import.meta.url.endsWith('/e2e/native-esm/__tests__/native-esm.test.js'),
   ).toBe(true);
+  if (process.platform === 'win32') {
+    expect(
+      import.meta.filename.endsWith(
+        '\\e2e\\native-esm\\__tests__\\native-esm.test.js',
+      ),
+    ).toBe(true);
+    expect(import.meta.dirname.endsWith('\\e2e\\native-esm\\__tests__')).toBe(
+      true,
+    );
+  } else {
+    expect(
+      import.meta.filename.endsWith(
+        '/e2e/native-esm/__tests__/native-esm.test.js',
+      ),
+    ).toBe(true);
+    expect(import.meta.dirname.endsWith('/e2e/native-esm/__tests__')).toBe(
+      true,
+    );
+  }
 });
 
 test('should double stuff', () => {

packages/jest-runtime/src/index.ts

@@ -520,6 +520,11 @@ export default class Runtime {
             initializeImportMeta: (meta: JestImportMeta) => {
               meta.url = pathToFileURL(modulePath).href;
 
+              // @ts-expect-error Jest uses @types/node@16. Will be fixed when updated to @types/[email protected]
+              meta.filename = fileURLToPath(meta.url);
+              // @ts-expect-error Jest uses @types/node@16. Will be fixed when updated to @types/[email protected]
+              meta.dirname = path.dirname(meta.filename);
+
               let jest = this.jestObjectCaches.get(modulePath);
 
               if (!jest) {
@@ -672,6 +677,13 @@ export default class Runtime {
             initializeImportMeta(meta: ImportMeta) {
               // no `jest` here as it's not loaded in a file
               meta.url = specifier;
+
+              if (meta.url.startsWith('file://')) {
+                // @ts-expect-error Jest uses @types/node@16. Will be fixed when updated to @types/[email protected]
+                meta.filename = fileURLToPath(meta.url);
+                // @ts-expect-error Jest uses @types/node@16. Will be fixed when updated to @types/[email protected]
+                meta.dirname = path.dirname(meta.filename);
+              }
             },
           });
         }
@@ -685,19 +697,22 @@ export default class Runtime {
       specifier = fileURLToPath(specifier);
     }
 
-    const [path, query] = specifier.split('?');
+    const [specifierPath, query] = specifier.split('?');
 
     if (
       await this._shouldMockModule(
         referencingIdentifier,
-        path,
+        specifierPath,
         this._explicitShouldMockModule,
       )
     ) {
-      return this.importMock(referencingIdentifier, path, context);
+      return this.importMock(referencingIdentifier, specifierPath, context);
     }
 
-    const resolved = await this._resolveModule(referencingIdentifier, path);
+    const resolved = await this._resolveModule(
+      referencingIdentifier,
+      specifierPath,
+    );
 
     if (
       // json files are modules when imported in modules