docs(lazy-barrel): clarify own-exports behavior for import-then-export records#9298
Merged
graphite-app[bot] merged 1 commit intoMay 6, 2026
Conversation
✅ Deploy Preview for rolldown-rs ready!
To edit notification comments on pull requests, go to your Netlify project configuration. |
hyfdev
approved these changes
May 6, 2026
Member
Merge activity
|
…t records (#9298) Related to #8895 ## Summary Updates `docs/in-depth/lazy-barrel-optimization.md` to reflect the behavior introduced by #8895. The "Own exports (non-pure re-export barrels)" section did not previously cover the import-then-export pattern (`import { a } from './a'; export { a }`). After #8895, the loader distinguishes: - **Dedicated re-export records** (`export { .. } from '..'`, `export * as ns from '..'`): when the barrel must execute, these can still fall back to an empty specifier set if their binding is not requested by `main.js`. - **Shared import records** (produced by `import { a } from '..'; export { a }`): always keep their full specifiers, because Rolldown cannot statically determine whether the barrel's own code references the binding. ## Changes - Extended the example in "Own exports" to include an `import { e } from './e'; export { e }` case. - Added a bullet describing how `e.js` is loaded with `e` requested. - Added a paragraph explicitly drawing the distinction between dedicated re-export records and shared import records, noting the precondition (barrel must execute because its own exports are loaded by main.js).
graphite-app
Bot
force-pushed
the
05-05-docs_lazy-barrel_clarify_own-exports_behavior_for_import-then-export_records
branch
from
May 6, 2026 06:58
5cb78dc to
3c6914a
Compare
graphite-app
Bot
deleted the
05-05-docs_lazy-barrel_clarify_own-exports_behavior_for_import-then-export_records
branch
May 6, 2026 07:00
Merged
Merged
shulaoda
added a commit
that referenced
this pull request
May 7, 2026
## [1.0.0] - 2026-05-07 ### 🐛 Bug Fixes - dev/lazy: lazily compiled modules should be watched (#9301) by @h-a-n-a - implement dynamic dominator merge logic (#9270) by @TheAlexLichter - dev: apply __toCommonJS interop when CJS requires ESM in HMR finalizer (#9261) by @h-a-n-a ### 🚜 Refactor - ecma_ast: tighten allocator access to enforce Sync invariant (#9278) by @IWANABETHATGUY - scan_stage: remove stmt_infos field from EcmaView (#9276) by @IWANABETHATGUY - link_stage: detach stmt_infos from EcmaView (#9274) by @IWANABETHATGUY - link_stage: detach depended_runtime_helper from EcmaView to remove unsafe (#9265) by @IWANABETHATGUY - link_stage: remove unsafe in determine_module_exports_kind (#9253) by @IWANABETHATGUY ### 📚 Documentation - getting-started: remove RC warning for 1.0.0 release (#9310) by @shulaoda - getting-started: update version references for 1.0.0 release (#9309) by @shulaoda - add Vite+ tab to getting-started snippets (#9285) by @shulaoda - lazy-barrel: clarify own-exports behavior for import-then-export records (#9298) by @shulaoda - restructure top navigation around Learn vs Reference (#9284) by @shulaoda - builtin-plugins: add bundle analyzer plugin docs (#9292) by @shulaoda - design doc for reference_needed_symbols (#9264) by @IWANABETHATGUY ### ⚡ Performance - devtools: write logs on a background thread (#9219) by @IWANABETHATGUY ### ⚙️ Miscellaneous Tasks - mark esbuild/ts/parameter_props_use_define_for_class_fields_true as passed (#9308) by @sapphi-red - deps: upgrade oxc to 0.129.0 (#9297) by @shulaoda - deps: update rollup submodule for tests to v4.60.3 (#9294) by @sapphi-red - deps: update test262 submodule for tests (#9295) by @sapphi-red - ai: add rolldown REPL decode skill (#9245) by @Dunqing
pull Bot
pushed a commit
to olrtg/rolldown
that referenced
this pull request
May 7, 2026
## [1.0.0] - 2026-05-07 ### 🐛 Bug Fixes - dev/lazy: lazily compiled modules should be watched (rolldown#9301) by @h-a-n-a - implement dynamic dominator merge logic (rolldown#9270) by @TheAlexLichter - dev: apply __toCommonJS interop when CJS requires ESM in HMR finalizer (rolldown#9261) by @h-a-n-a ### 🚜 Refactor - ecma_ast: tighten allocator access to enforce Sync invariant (rolldown#9278) by @IWANABETHATGUY - scan_stage: remove stmt_infos field from EcmaView (rolldown#9276) by @IWANABETHATGUY - link_stage: detach stmt_infos from EcmaView (rolldown#9274) by @IWANABETHATGUY - link_stage: detach depended_runtime_helper from EcmaView to remove unsafe (rolldown#9265) by @IWANABETHATGUY - link_stage: remove unsafe in determine_module_exports_kind (rolldown#9253) by @IWANABETHATGUY ### 📚 Documentation - getting-started: remove RC warning for 1.0.0 release (rolldown#9310) by @shulaoda - getting-started: update version references for 1.0.0 release (rolldown#9309) by @shulaoda - add Vite+ tab to getting-started snippets (rolldown#9285) by @shulaoda - lazy-barrel: clarify own-exports behavior for import-then-export records (rolldown#9298) by @shulaoda - restructure top navigation around Learn vs Reference (rolldown#9284) by @shulaoda - builtin-plugins: add bundle analyzer plugin docs (rolldown#9292) by @shulaoda - design doc for reference_needed_symbols (rolldown#9264) by @IWANABETHATGUY ### ⚡ Performance - devtools: write logs on a background thread (rolldown#9219) by @IWANABETHATGUY ### ⚙️ Miscellaneous Tasks - mark esbuild/ts/parameter_props_use_define_for_class_fields_true as passed (rolldown#9308) by @sapphi-red - deps: upgrade oxc to 0.129.0 (rolldown#9297) by @shulaoda - deps: update rollup submodule for tests to v4.60.3 (rolldown#9294) by @sapphi-red - deps: update test262 submodule for tests (rolldown#9295) by @sapphi-red - ai: add rolldown REPL decode skill (rolldown#9245) by @Dunqing Co-authored-by: shulaoda <[email protected]>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Related to #8895
Summary
Updates
docs/in-depth/lazy-barrel-optimization.mdto reflect the behavior introduced by #8895.The "Own exports (non-pure re-export barrels)" section did not previously cover the import-then-export pattern (
import { a } from './a'; export { a }). After #8895, the loader distinguishes:export { .. } from '..',export * as ns from '..'): when the barrel must execute, these can still fall back to an empty specifier set if their binding is not requested bymain.js.import { a } from '..'; export { a }): always keep their full specifiers, because Rolldown cannot statically determine whether the barrel's own code references the binding.Changes
import { e } from './e'; export { e }case.e.jsis loaded witherequested.