Module System: Modernize to ES6 modules with codemod

[justin808]

Description

The codebase currently uses CommonJS export = and require() patterns which prevent full ES6 module adoption. This issue tracks the creation of a codemod for automated migration in a future major version.

Current State

• Multiple files use export = for CommonJS compatibility
• Dynamic require() calls throughout the codebase
• Consumers rely on require() to import these modules

Files Using export =

• package/rules/webpack.ts
• package/rules/rspack.ts
• package/env.ts
• Other configuration export files

Proposed Solution

1. Create a codemod that:
   • Converts export = to export default
   • Converts require() to import statements
   • Handles dynamic imports appropriately
2. Test codemod on example projects
3. Document migration path for users
4. Release as part of next major version

Acceptance Criteria

• Codemod successfully converts all patterns
• Migration guide written
• Example migrations provided
• All tests pass with ES6 modules
• Performance benchmarks show no regression

Breaking Change Notice

This will be a breaking change requiring a major version bump. Users will need to update their import statements or run the provided codemod.

Related

• See ESLINT_TECHNICAL_DEBT.md for full context
• Blocks full TypeScript strict mode adoption