check for runtime support

jestjs · Aug 16, 2021 · 94d1903 · 94d1903
1 parent 4668312
commit 94d1903
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Showing 2 changed files with 47 additions and 16 deletions.
diff --git a/packages/jest-runtime/src/__tests__/runtime_require_module.test.js b/packages/jest-runtime/src/__tests__/runtime_require_module.test.js
@@ -188,15 +188,17 @@ describe('Runtime requireModule', () => {
     }).not.toThrow();
   });
 
-  it('finds node core built-in modules with node:prefix', async () => {
-    const runtime = await createRuntime(__filename);
+  onNodeVersions('^16.0.0', () => {
+    it('finds node core built-in modules with node:prefix', async () => {
+      const runtime = await createRuntime(__filename);
 
-    expect(runtime.requireModule(runtime.__mockRootPath, 'fs')).toBe(
-      runtime.requireModule(runtime.__mockRootPath, 'node:fs'),
-    );
-    expect(runtime.requireModule(runtime.__mockRootPath, 'module')).toBe(
-      runtime.requireModule(runtime.__mockRootPath, 'node:module'),
-    );
+      expect(runtime.requireModule(runtime.__mockRootPath, 'fs')).toBe(
+        runtime.requireModule(runtime.__mockRootPath, 'node:fs'),
+      );
+      expect(runtime.requireModule(runtime.__mockRootPath, 'module')).toBe(
+        runtime.requireModule(runtime.__mockRootPath, 'node:module'),
+      );
+    });
   });
 
   it('finds and loads JSON files without file extension', async () => {

diff --git a/packages/jest-runtime/src/index.ts b/packages/jest-runtime/src/index.ts
@@ -149,6 +149,28 @@ const supportsTopLevelAwait =
     }
   })();
 
+const supportsNodeColonModulePrefixInRequire = (() => {
+  try {
+    require('node:fs');
+
+    return true;
+  } catch {
+    return false;
+  }
+})();
+
+const supportsNodeColonModulePrefixInImport = (async () => {
+  try {
+    // @ts-expect-error
+    // eslint-disable-next-line import/no-unresolved
+    await import('node:fs');
+
+    return true;
+  } catch {
+    return false;
+  }
+})();
+
 export default class Runtime {
   private readonly _cacheFS: Map<string, string>;
   private readonly _config: Config.ProjectConfig;
@@ -411,7 +433,7 @@ export default class Runtime {
       );
 
       if (this._resolver.isCoreModule(modulePath)) {
-        const core = this._importCoreModule(modulePath, context);
+        const core = await this._importCoreModule(modulePath, context);
         this._esmoduleRegistry.set(cacheKey, core);
 
         transformResolve();
@@ -645,7 +667,10 @@ export default class Runtime {
     }
 
     if (moduleName && this._resolver.isCoreModule(moduleName)) {
-      return this._requireCoreModule(moduleName);
+      return this._requireCoreModule(
+        moduleName,
+        supportsNodeColonModulePrefixInRequire,
+      );
     }
 
     if (!modulePath) {
@@ -1331,10 +1356,11 @@ export default class Runtime {
     }
   }
 
-  private _requireCoreModule(moduleName: string) {
-    const moduleWithoutNodePrefix = moduleName.startsWith('node:')
-      ? moduleName.slice('node:'.length)
-      : moduleName;
+  private _requireCoreModule(moduleName: string, supportPrefix: boolean) {
+    const moduleWithoutNodePrefix =
+      supportPrefix && moduleName.startsWith('node:')
+        ? moduleName.slice('node:'.length)
+        : moduleName;
 
     if (moduleWithoutNodePrefix === 'process') {
       return this._environment.global.process;
@@ -1347,8 +1373,11 @@ export default class Runtime {
     return require(moduleWithoutNodePrefix);
   }
 
-  private _importCoreModule(moduleName: string, context: VMContext) {
-    const required = this._requireCoreModule(moduleName);
+  private async _importCoreModule(moduleName: string, context: VMContext) {
+    const required = this._requireCoreModule(
+      moduleName,
+      await supportsNodeColonModulePrefixInImport,
+    );
 
     const module = new SyntheticModule(
       ['default', ...Object.keys(required)],