module: move test reporter loading

Move the logic for handling --test-reporter out of the
general module loader and into the test_runner subsystem.

doc/api/test.md

@@ -470,7 +470,7 @@ The following built-reporters are supported:
   The `spec` reporter outputs the test results in a human-readable format.
 
 * `dot`
-  The `dot` reporter outputs the test results in a comact format,
+  The `dot` reporter outputs the test results in a compact format,
   where each passing test is represented by a `.`,
   and each failing test is represented by a `X`.
 
@@ -591,6 +591,9 @@ module.exports = async function * customReporter(source) {
 };
 ```
 
+The value provided for `--test-reporter` is parsed via the same rules as the
+value for [`--import`][].
+
 ### Multiple reporters
 
 The [`--test-reporter`][] flag can be specified multiple times to report test
@@ -1585,6 +1588,7 @@ added:
   aborted.
 
 [TAP]: https://testanything.org/
+[`--import`]: cli.md#--importmodule
 [`--test-name-pattern`]: cli.md#--test-name-pattern
 [`--test-only`]: cli.md#--test-only
 [`--test-reporter-destination`]: cli.md#--test-reporter-destination

lib/internal/modules/run_main.js

@@ -2,10 +2,11 @@
 
 const {
   ObjectCreate,
+  StringPrototypeEndsWith,
 } = primordials;
+
 const { getOptionValue } = require('internal/options');
 const path = require('path');
-const { shouldUseESMLoader } = require('internal/modules/utils');
 
 function resolveMainPath(main) {
   // Note extension resolution for the main entry point can be deprecated in a
@@ -23,6 +24,29 @@ function resolveMainPath(main) {
   return mainPath;
 }
 
+function shouldUseESMLoader(mainPath) {
+  /**
+   * @type {string[]} userLoaders A list of custom loaders registered by the user
+   * (or an empty list when none have been registered).
+   */
+  const userLoaders = getOptionValue('--experimental-loader');
+  /**
+   * @type {string[]} userImports A list of preloaded modules registered by the user
+   * (or an empty list when none have been registered).
+   */
+  const userImports = getOptionValue('--import');
+  if (userLoaders.length > 0 || userImports.length > 0)
+    return true;
+  const { readPackageScope } = require('internal/modules/cjs/loader');
+  // Determine the module format of the main
+  if (mainPath && StringPrototypeEndsWith(mainPath, '.mjs'))
+    return true;
+  if (!mainPath || StringPrototypeEndsWith(mainPath, '.cjs'))
+    return false;
+  const pkg = readPackageScope(mainPath);
+  return pkg && pkg.data.type === 'module';
+}
+
 function runMainESM(mainPath) {
   const { loadESM } = require('internal/process/esm_loader');
   const { pathToFileURL } = require('internal/url');

lib/internal/modules/utils.js

@@ -1,55 +0,0 @@
-'use strict';
-
-const {
-  ObjectCreate,
-  StringPrototypeEndsWith,
-} = primordials;
-const { getOptionValue } = require('internal/options');
-
-
-function shouldUseESMLoader(filePath) {
-  /**
-   * @type {string[]} userLoaders A list of custom loaders registered by the user
-   * (or an empty list when none have been registered).
-   */
-  const userLoaders = getOptionValue('--experimental-loader');
-  /**
-   * @type {string[]} userImports A list of preloaded modules registered by the user
-   * (or an empty list when none have been registered).
-   */
-  const userImports = getOptionValue('--import');
-  if (userLoaders.length > 0 || userImports.length > 0)
-    return true;
-  // Determine the module format of the main
-  if (filePath && StringPrototypeEndsWith(filePath, '.mjs'))
-    return true;
-  if (!filePath || StringPrototypeEndsWith(filePath, '.cjs'))
-    return false;
-  const { readPackageScope } = require('internal/modules/cjs/loader');
-  const pkg = readPackageScope(filePath);
-  return pkg?.data?.type === 'module';
-}
-
-/**
- * @param {string} filePath
- * @returns {any}
- * requireOrImport imports a module if the file is an ES module, otherwise it requires it.
- */
-function requireOrImport(filePath) {
-  const useESMLoader = shouldUseESMLoader(filePath);
-  if (useESMLoader) {
-    const { esmLoader } = require('internal/process/esm_loader');
-    const { pathToFileURL } = require('internal/url');
-    const { isAbsolute } = require('path');
-    const file = isAbsolute(filePath) ? pathToFileURL(filePath).href : filePath;
-    return esmLoader.import(file, undefined, ObjectCreate(null));
-  }
-  const { Module } = require('internal/modules/cjs/loader');
-
-  return new Module._load(filePath, null, false);
-}
-
-module.exports = {
-  shouldUseESMLoader,
-  requireOrImport,
-};

lib/internal/test_runner/utils.js

@@ -7,11 +7,10 @@ const {
   RegExpPrototypeExec,
   SafeMap,
 } = primordials;
-const { basename } = require('path');
+const { basename, isAbsolute } = require('path');
 const { createWriteStream } = require('fs');
 const { createDeferredPromise } = require('internal/util');
 const { getOptionValue } = require('internal/options');
-const { requireOrImport } = require('internal/modules/utils');
 
 const {
   codes: {
@@ -103,7 +102,13 @@ const kDefaultDestination = 'stdout';
 async function getReportersMap(reporters, destinations) {
   return SafePromiseAllReturnArrayLike(reporters, async (name, i) => {
     const destination = kBuiltinDestinations.get(destinations[i]) ?? createWriteStream(destinations[i]);
-    let reporter = await requireOrImport(kBuiltinReporters.get(name) ?? name);
+
+    // Load the test reporter passed to --test-reporter
+    let reporterPath = kBuiltinReporters.get(name) ?? name;
+    const { esmLoader } = require('internal/process/esm_loader');
+    const { pathToFileURL } = require('internal/url');
+    const file = isAbsolute(reporterPath) ? pathToFileURL(reporterPath).href : reporterPath;
+    let reporter = await esmLoader.import(file, undefined, { __proto__: null });
 
     if (reporter?.default) {
       reporter = reporter.default;

test/parallel/test-bootstrap-modules.js

@@ -53,7 +53,6 @@ const expectedModules = new Set([
   'NativeModule internal/idna',
   'NativeModule internal/linkedlist',
   'NativeModule internal/modules/cjs/loader',
-  'NativeModule internal/modules/utils',
   'NativeModule internal/modules/esm/utils',
   'NativeModule internal/modules/helpers',
   'NativeModule internal/modules/package_json_reader',