update tests

test/es-module/test-esm-cjs-exports.js

@@ -21,9 +21,8 @@ describe('ESM: importing CJS', { concurrency: !process.env.TEST_PARALLEL }, () =
     const invalidEntry = fixtures.path('/es-modules/cjs-exports-invalid.mjs');
     const { code, signal, stderr } = await spawnPromisified(execPath, [invalidEntry]);
 
+    assert.match(stderr, /SyntaxError: The requested module '\.\/invalid-cjs\.js' does not provide an export named 'default'/);
     assert.strictEqual(code, 1);
     assert.strictEqual(signal, null);
-    assert.ok(stderr.includes('Warning: To load an ES module'));
-    assert.ok(stderr.includes('Unexpected token \'export\''));
   });
 });

test/es-module/test-esm-detect-ambiguous.mjs

@@ -185,7 +185,7 @@ describe('--experimental-detect-module', { concurrency: !process.env.TEST_PARALL
       ]);
 
       strictEqual(stderr, '');
-      strictEqual(stdout, 'null\nexecuted\n');
+      strictEqual(stdout, 'undefined\nexecuted\n');
       strictEqual(code, 0);
       strictEqual(signal, null);
 

test/es-module/test-esm-extensionless-esm-and-wasm.mjs

@@ -60,26 +60,19 @@ describe('extensionless Wasm modules within a "type": "module" package scope', {
 });
 
 describe('extensionless ES modules within no package scope', { concurrency: !process.env.TEST_PARALLEL }, () => {
-  // This succeeds with `--experimental-default-type=module`
-  it('should error as the entry point', async () => {
+  it('should run as the entry point', async () => {
     const { code, signal, stdout, stderr } = await spawnPromisified(process.execPath, [
       fixtures.path('es-modules/noext-esm'),
     ]);
 
-    match(stderr, /SyntaxError/);
-    strictEqual(stdout, '');
-    strictEqual(code, 1);
+    strictEqual(stdout, 'executed\n');
+    strictEqual(stderr, '');
+    strictEqual(code, 0);
     strictEqual(signal, null);
   });
 
-  // This succeeds with `--experimental-default-type=module`
-  it('should error on import', async () => {
-    try {
-      await import(fixtures.fileURL('es-modules/noext-esm'));
-      mustNotCall();
-    } catch (err) {
-      ok(err instanceof SyntaxError);
-    }
+  it('should run on import', async () => {
+    await import(fixtures.fileURL('es-modules/noext-esm'));
   });
 });
 

test/es-module/test-esm-import-flag.mjs

@@ -146,9 +146,9 @@ describe('import modules using --import', { concurrency: !process.env.TEST_PARAL
       ]
     );
 
-    assert.match(stderr, /SyntaxError: Unexpected token 'export'/);
+    assert.strictEqual(stderr, '');
     assert.match(stdout, /^\.mjs file\r?\n$/);
-    assert.strictEqual(code, 1);
+    assert.strictEqual(code, 0);
     assert.strictEqual(signal, null);
   });
 

test/es-module/test-esm-loader-hooks.mjs

@@ -751,15 +751,15 @@ describe('Loader hooks', { concurrency: !process.env.TEST_PARALLEL }, () => {
       '--no-warnings',
       '--experimental-loader',
       `data:text/javascript,import{readFile}from"node:fs/promises";import{fileURLToPath}from"node:url";export ${
-        async function load(u, c, n) {
-          const r = await n(u, c);
-          if (u.endsWith('/common/index.js')) {
-            r.source = '"use strict";module.exports=require("node:module").createRequire(' +
-                     `${JSON.stringify(u)})(${JSON.stringify(fileURLToPath(u))});\n`;
-          } else if (c.format === 'commonjs') {
-            r.source = await readFile(new URL(u));
+        async function load(url, context, nextLoad) {
+          const result = await nextLoad(url, context);
+          if (url.endsWith('/common/index.js')) {
+            result.source = '"use strict";module.exports=require("node:module").createRequire(' +
+                     `${JSON.stringify(url)})(${JSON.stringify(fileURLToPath(url))});\n`;
+          } else if (url.startsWith('file:') && (context.format === undefined || context.format === 'commonjs')) {
+            result.source = await readFile(new URL(url));
           }
-          return r;
+          return result;
         }}`,
       '--experimental-loader',
       fixtures.fileURL('es-module-loaders/loader-resolve-passthru.mjs'),

test/es-module/test-esm-resolve-type.mjs

@@ -41,8 +41,8 @@ try {
     [ '/es-modules/package-ends-node_modules/index.js', 'module' ],
     [ '/es-modules/package-type-module/index.js', 'module' ],
     [ '/es-modules/package-type-commonjs/index.js', 'commonjs' ],
-    [ '/es-modules/package-without-type/index.js', 'commonjs' ],
-    [ '/es-modules/package-without-pjson/index.js', 'commonjs' ],
+    [ '/es-modules/package-without-type/index.js', undefined ],
+    [ '/es-modules/package-without-pjson/index.js', undefined ],
   ].forEach(([ testScript, expectedType ]) => {
     const resolvedPath = path.resolve(fixtures.path(testScript));
     const resolveResult = resolve(url.pathToFileURL(resolvedPath));
@@ -55,11 +55,11 @@ try {
    *
    * for test-module-ne: everything .js that is not 'module' is 'commonjs'
    */
-  for (const [ moduleName, moduleExtenstion, moduleType, expectedResolvedType ] of
+  for (const [ moduleName, moduleExtension, moduleType, expectedResolvedType ] of
     [ [ 'test-module-mainjs', 'js', 'module', 'module'],
       [ 'test-module-mainmjs', 'mjs', 'module', 'module'],
       [ 'test-module-cjs', 'js', 'commonjs', 'commonjs'],
-      [ 'test-module-ne', 'js', undefined, 'commonjs'],
+      [ 'test-module-ne', 'js', undefined, undefined],
     ]) {
     process.chdir(previousCwd);
     tmpdir.refresh();
@@ -73,14 +73,14 @@ try {
     const mDir = rel(`node_modules/${moduleName}`);
     const subDir = rel(`node_modules/${moduleName}/subdir`);
     const pkg = rel(`node_modules/${moduleName}/package.json`);
-    const script = rel(`node_modules/${moduleName}/subdir/mainfile.${moduleExtenstion}`);
+    const script = rel(`node_modules/${moduleName}/subdir/mainfile.${moduleExtension}`);
 
     createDir(nmDir);
     createDir(mDir);
     createDir(subDir);
     const pkgJsonContent = {
       ...(moduleType !== undefined) && { type: moduleType },
-      main: `subdir/mainfile.${moduleExtenstion}`
+      main: `subdir/mainfile.${moduleExtension}`
     };
     fs.writeFileSync(pkg, JSON.stringify(pkgJsonContent));
     fs.writeFileSync(script,

test/es-module/test-require-module-implicit.js

@@ -1,26 +1,12 @@
 // Flags: --experimental-require-module
 'use strict';
 
-// Tests that require()ing modules without explicit module type information
-// warns and errors.
+// Tests that require()ing .mjs should not be matched as default extensions.
 require('../common');
 const assert = require('assert');
 const { isModuleNamespaceObject } = require('util/types');
 
-assert.throws(() => {
-  require('../fixtures/es-modules/package-without-type/noext-esm');
-}, {
-  message: /Unexpected token 'export'/
-});
-
-assert.throws(() => {
-  require('../fixtures/es-modules/loose.js');
-}, {
-  message: /Unexpected token 'export'/
-});
-
 {
-  // .mjs should not be matched as default extensions.
   const id = '../fixtures/es-modules/should-not-be-resolved';
   assert.throws(() => {
     require(id);

test/fixtures/es-module-loaders/builtin-named-exports-loader.mjs

@@ -28,7 +28,7 @@ export function load(url, context, next) {
       source: generateBuiltinModule(urlObj.pathname),
       format: 'commonjs',
     };
-  } else if (context.format === 'commonjs') {
+  } else if (context.format === undefined || context.format === 'commonjs') {
     return {
       shortCircuit: true,
       source: readFileSync(new URL(url)),