test(e2e): migrate test cases to ES modules

[chenjiahan]

Summary

Migrate all test cases to ES modules:

• update package.json files to use "type": "module"
• convert .mjs files to .js
• replace __dirname with import.meta.dirname

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This pull request migrates the e2e test suite from CommonJS to ES modules (ESM). The migration involves:

• Adding "type": "module" to package.json files throughout the e2e directory
• Replacing __dirname with import.meta.dirname (Node.js 20.11+ feature)
• Adding .ts extensions to relative imports in TypeScript files
• Converting CommonJS exports (module.exports) to ESM exports (export)
• Changing file extensions from .mjs to .js for ES module files
• Removing manual __dirname polyfills using fileURLToPath
• Enabling TypeScript compiler option allowImportingTsExtensions

Reviewed Changes

Copilot reviewed 158 out of 160 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
e2e/package.json, e2e/helper/package.json, e2e/cases/*/package.json	Added "type": "module" to enable ESM
e2e/tsconfig.json	Added allowImportingTsExtensions compiler option
e2e/helper/*.ts	Updated imports to include .ts extensions
e2e/cases/**/*.test.ts	Replaced __dirname with import.meta.dirname
e2e/cases/**/rsbuild.config.ts	Replaced __dirname with import.meta.dirname
e2e/cases/**/*.js	Converted from CommonJS to ESM, changed .mjs to .js
e2e/test.cjs	New test file using CommonJS (likely for testing interop)
e2e/cases/module/esm-exports/*	Removed test files (test no longer relevant)

Comments suppressed due to low confidence (1)

e2e/cases/plugin-babel/basic/plugins/myBabelPlugin.ts:4

• [nitpick] The type annotation added to the path parameter is overly simplified and may not accurately represent the Babel NodePath type. Consider importing the proper type from @babel/traverse or @babel/core for better type safety and IDE support, e.g., import type { NodePath } from '@babel/traverse' and then use Identifier(path: NodePath<t.Identifier>).

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