esm: refactor test-esm-named-exports

PR-URL: nodejs#49493
Reviewed-By: Jacob Smith <jacob@frende.me>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

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

@@ -1,44 +1,44 @@
-// Flags: --loader ./test/fixtures/es-module-loaders/hook-resolve-type.mjs
-import { allowGlobals } from '../common/index.mjs';
+import { spawnPromisified } from '../common/index.mjs';
+import * as tmpdir from '../common/tmpdir.js';
 import * as fixtures from '../common/fixtures.mjs';
-import { strict as assert } from 'assert';
-import * as fs from 'fs';
-
-allowGlobals(global.getModuleTypeStats);
-
-const { importedESM: importedESMBefore,
-        importedCJS: importedCJSBefore } = await global.getModuleTypeStats();
-
-const basePath =
-  new URL('./node_modules/', import.meta.url);
-
-const rel = (file) => new URL(file, basePath);
-const createDir = (path) => {
-  if (!fs.existsSync(path)) {
-    fs.mkdirSync(path);
-  }
-};
+import { deepStrictEqual } from 'node:assert';
+import { mkdir, rm, cp } from 'node:fs/promises';
+import { execPath } from 'node:process';
 
+const base = tmpdir.fileURL(`test-esm-loader-resolve-type-${(Math.random() * Date.now()).toFixed(0)}`);
 const moduleName = 'module-counter-by-type';
-const moduleDir = rel(`${moduleName}`);
+const moduleURL = new URL(`${base}/node_modules/${moduleName}`);
 try {
-  createDir(basePath);
-  createDir(moduleDir);
-  fs.cpSync(
-    fixtures.path('es-modules', moduleName),
-    moduleDir,
+  await mkdir(moduleURL, { recursive: true });
+  await cp(
+    fixtures.path('es-modules', 'module-counter-by-type'),
+    moduleURL,
     { recursive: true }
   );
 
-
-  await import(`${moduleName}`);
+  deepStrictEqual(await spawnPromisified(
+    execPath,
+    [
+      '--no-warnings',
+      '--input-type=module',
+      '--eval',
+      `import { getModuleTypeStats } from ${JSON.stringify(fixtures.fileURL('es-module-loaders', 'hook-resolve-type.mjs'))};
+      const before = getModuleTypeStats();
+      await import(${JSON.stringify(moduleName)});
+      const after = getModuleTypeStats();
+      console.log(JSON.stringify({ before, after }));`,
+    ],
+    { cwd: base },
+  ), {
+    stderr: '',
+    stdout: JSON.stringify({
+      before: { importedESM: 0, importedCJS: 0 },
+      // Dynamic import in the eval script should increment ESM counter but not CJS counter
+      after: { importedESM: 1, importedCJS: 0 },
+    }) + '\n',
+    code: 0,
+    signal: null,
+  });
 } finally {
-  fs.rmSync(basePath, { recursive: true, force: true });
+  await rm(base, { recursive: true, force: true });
 }
-
-const { importedESM: importedESMAfter,
-        importedCJS: importedCJSAfter } = await global.getModuleTypeStats();
-
-// Dynamic import above should increment ESM counter but not CJS counter
-assert.strictEqual(importedESMBefore + 1, importedESMAfter);
-assert.strictEqual(importedCJSBefore, importedCJSAfter);

test/es-module/test-esm-named-exports.mjs

@@ -1,4 +1,4 @@
-// Flags: --experimental-loader ./test/fixtures/es-module-loaders/builtin-named-exports-loader.mjs
+// Flags: --import ./test/fixtures/es-module-loaders/builtin-named-exports.mjs
 import '../common/index.mjs';
 import { readFile, __fromLoader } from 'fs';
 import assert from 'assert';

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

@@ -1,16 +1,9 @@
-import module from 'module';
-
-const GET_BUILTIN = `$__get_builtin_hole_${Date.now()}`;
-
-export function globalPreload() {
-  return `Object.defineProperty(globalThis, ${JSON.stringify(GET_BUILTIN)}, {
-  value: (builtinName) => {
-    return getBuiltin(builtinName);
-  },
-  enumerable: false,
-  configurable: false,
-});
-`;
+import module from 'node:module';
+
+/** @type {string} */
+let GET_BUILTIN;
+export function initialize(data) {
+  GET_BUILTIN = data.GET_BUILTIN;
 }
 
 export async function resolve(specifier, context, next) {

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

@@ -0,0 +1,17 @@
+import * as fixtures from '../../common/fixtures.mjs';
+import { createRequire, register } from 'node:module';
+
+const require = createRequire(import.meta.url);
+
+const GET_BUILTIN = `$__get_builtin_hole_${Date.now()}`;
+Object.defineProperty(globalThis, GET_BUILTIN, {
+  value: builtinName => require(builtinName),
+  enumerable: false,
+  configurable: false,
+});
+
+register(fixtures.fileURL('es-module-loaders/builtin-named-exports-loader.mjs'), {
+  data: {
+    GET_BUILTIN,
+  },
+});