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Don't retarget dependencies if a symbol is imported multiple times with different local names #8738

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merged 2 commits into from
Jan 3, 2023

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@mischnic mischnic commented Jan 1, 2023

Closes #8705

export {x, x as y} from "./c";

can cause a situation where it tried to rewrite a dependency to have these symbols (so saying that in the parent asset, import x and make it available as $id$re_export$x and also import x and make it available as $id$re_export$y:

new Map([
	[ "x", { local: "$id$re_export$x" } ],
	[ "x", { local: "$id$re_export$y" } ]
])

This seems fine but the way this is achieved in the symbols is that the transformer detects and uses the same local identifier for both. When retargeting dependencies however, the asset symbols cannot be changed so it just has to deopt out of retargeting here.

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Benchmark Results

Kitchen Sink ✅

Timings

Description Time Difference
Cold 1.40s -21.00ms
Cached 324.00ms +4.00ms

Cold Bundles

No bundle changes detected.

Cached Bundles

Bundle Size Difference Time Difference
dist/legacy/parcel.7cdb0fad.webp 102.94kb +0.00b 84.00ms -144.00ms 🚀
dist/legacy/parcel.7cdb0fad.webp 102.94kb +0.00b 85.00ms -146.00ms 🚀
dist/modern/parcel.7cdb0fad.webp 102.94kb +0.00b 85.00ms -145.00ms 🚀
dist/legacy/index.html 826.00b +0.00b 506.00ms +29.00ms ⚠️
dist/modern/index.html 749.00b +0.00b 506.00ms +31.00ms ⚠️

React HackerNews ✅

Timings

Description Time Difference
Cold 8.88s -43.00ms
Cached 399.00ms -28.00ms 🚀

Cold Bundles

No bundle changes detected.

Cached Bundles

No bundle changes detected.

AtlasKit Editor ✅

Timings

Description Time Difference
Cold 1.48m +825.00ms
Cached 1.99s +8.00ms

Cold Bundles

No bundle changes detected.

Cached Bundles

Bundle Size Difference Time Difference
dist/index.html 167.00b +0.00b 1.11m +10.76s ⚠️

Three.js ✅

Timings

Description Time Difference
Cold 6.53s -45.00ms
Cached 259.00ms +6.00ms

Cold Bundles

No bundle changes detected.

Cached Bundles

Bundle Size Difference Time Difference
dist/Three.js 580.02kb +0.00b 4.52s -246.00ms 🚀

Click here to view a detailed benchmark overview.

@devongovett devongovett merged commit eba8dd6 into v2 Jan 3, 2023
@devongovett devongovett deleted the retarget-dep-duplicates branch January 3, 2023 17:18
marcins pushed a commit to marcins/parcel that referenced this pull request Jul 14, 2023
* upstream/v2: (33 commits)
  v2.8.3
  Changelog for v2.8.3
  Address bug by updating an asset reference and merge conditions (parcel-bundler#8762)
  Fix CSS order when merging type change bundles (parcel-bundler#8766)
  fixing failing build for contributors on Linux using Node 18 (parcel-bundler#8763)
  Extension: Importers View and separate LSP protocol package (parcel-bundler#8747)
  Bump swc to fix sourcemaps with Windows line endings (parcel-bundler#8756)
  Apply HMR updates in topological order (parcel-bundler#8752)
  Make extension packaging work (parcel-bundler#8730)
  Typed api.storeResult (parcel-bundler#8732)
  Refactor LSP to use vscode-jsonrpc (parcel-bundler#8728)
  Bump swc (parcel-bundler#8742)
  Recursively check reachability when removing asset graphs from bundles in deduplication (parcel-bundler#6004)
  Fix tsc sourcemaps metadata (parcel-bundler#8734)
  Assigning to `this` in CommonJS (parcel-bundler#8737)
  Don't retarget dependencies if a symbol is imported multiple times with different local names (parcel-bundler#8738)
  Add a note about using flow in CONTRIBUTING.md (parcel-bundler#8731)
  filter out title execArgv to workers (parcel-bundler#8719)
  Document more of the BundleGraph class (parcel-bundler#8711)
  Fixed the hmr connection with host 0.0.0.0 (parcel-bundler#7357)
  ...
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Successfully merging this pull request may close these issues.

Regression: parcel@2.8.1 build keeps undefined $7f9d4f94f3d938e3$re_export$bool for ESM
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