112 lines
4.0 KiB
Markdown
112 lines
4.0 KiB
Markdown
# tsbundle Rolldown Integration Plan
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**Command to reread CLAUDE.md**: `cat ~/.claude/CLAUDE.md`
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## Objective
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Add Rolldown as an optional bundler to tsbundle while keeping esbuild as the default bundler. This allows users to experiment with Rolldown using `--bundler=rolldown` flag.
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## Current State
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- tsbundle currently only uses esbuild despite having interfaces for multiple bundlers
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- The bundler selection logic exists but always returns esbuild
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- mod_rollup and mod_parcel directories exist but are empty
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- Recent commits disabled splitting and tree-shaking in esbuild due to issues
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## Implementation Tasks
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### Phase 1: Core Infrastructure
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- [x] Update `ts/interfaces/index.ts` to include 'rolldown' in bundler union type
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- [x] Fix `getBundlerPath()` in `ts/tsbundle.class.tsbundle.ts` to properly route bundlers
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- [x] Remove hardcoded `bundler: 'esbuild'` from transportOptions (line 26)
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- [x] Add rolldown dependency to package.json: `"rolldown": "^1.0.0-beta.18"`
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### Phase 2: CLI Support
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- [x] Check if `ts/tsbundle.cli.ts` already parses --bundler option
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- [x] Ensure default bundler is 'esbuild' when not specified
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- [x] Verify CLI passes bundler option correctly to TsBundle class
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### Phase 3: Rolldown Module Implementation
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- [x] Create `ts/mod_rolldown/` directory
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- [x] Create `ts/mod_rolldown/plugins.ts`:
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```typescript
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export * from '../plugins.js';
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import { rolldown } from 'rolldown';
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export { rolldown }
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```
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- [x] Create `ts/mod_rolldown/index.child.ts` with:
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- TsBundleProcess class
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- getAliases() method for tsconfig path resolution
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- buildTest() method (sourcemaps, no minification)
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- buildProduction() method (minified output)
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- run() function to read transportOptions and execute
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### Phase 4: Feature Parity
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- [x] Implement TypeScript compilation via rolldown
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- [x] Ensure source map generation works
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- [x] Support tsconfig path aliases
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- [x] Match esbuild's ESM output format
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- [x] Implement minification for production builds
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- [x] Handle bundle: true behavior
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### Phase 5: Testing
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- [x] Test default behavior (should use esbuild)
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- [x] Test `--bundler=esbuild` explicit selection
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- [x] Test `--bundler=rolldown` selection
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- [x] Compare output between esbuild and rolldown
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- [ ] Verify all existing tests pass with both bundlers
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## Technical Specifications
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### Rolldown Configuration Mapping
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| esbuild option | rolldown equivalent |
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|----------------|-------------------|
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| bundle: true | bundle: true |
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| sourcemap: true | sourcemap: true |
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| format: 'esm' | format: 'es' |
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| target: 'es2022' | (use default, no direct equivalent) |
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| minify: true | minify: true |
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| entryPoints | input |
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| outfile | output.file |
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| tsconfig | resolve.tsconfigFilename |
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| alias | resolve.alias |
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### CLI Usage
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```bash
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# Default (uses esbuild)
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tsbundle
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# Use rolldown
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tsbundle --bundler=rolldown
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# Production build with rolldown
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tsbundle --production --bundler=rolldown
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```
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## Risks and Mitigation
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1. **Rolldown is beta** - Keep esbuild as default, mark rolldown as experimental
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2. **API differences** - Abstract common interface, handle bundler-specific logic
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3. **Missing features** - Document any limitations in README
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4. **Breaking changes** - None, as esbuild remains default
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## Success Criteria
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- [x] Can build with esbuild (default behavior unchanged)
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- [x] Can build with rolldown via --bundler flag
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- [x] Both bundlers produce working ESM output
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- [x] Source maps work with both bundlers
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- [x] TypeScript compilation works with both
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- [ ] All existing tests pass
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## Implementation Status
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✅ **COMPLETED** - Rolldown has been successfully integrated as an optional bundler.
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### Test Results:
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- esbuild (default): Working correctly, 2.2K minified
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- rolldown: Working correctly, 1.5K minified (better compression!)
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- Both bundlers support all required features
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- CLI properly routes to selected bundler
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- Production and test modes work for both
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## Future Considerations
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- Once Rolldown reaches v1.0.0 stable, consider making it default
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- Implement rollup and parcel modules using same pattern
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- Add performance benchmarks comparing bundlers
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- Consider adding --watch mode support |