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Make const reassignments only a warning #6020

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Merged
merged 2 commits into from
Jul 26, 2025
Merged

Make const reassignments only a warning #6020

merged 2 commits into from
Jul 26, 2025

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lukastaegert
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This PR contains:

  • bugfix
  • feature
  • refactor
  • documentation
  • other

Are tests included?

  • yes (bugfixes and features will not be merged without tests)
  • no

Breaking Changes?

  • yes (breaking changes will not be merged unless absolutely necessary)
  • no

List any relevant issue numbers:

Description

While I still think it is useful to detect const reassignments, I agree that it might be enough to warn about these cases and still emit a bundle. After all in browsers, const reassignments are no parse error but runtime errors, so issues in unused code or within try-catch can still be handled.

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vercel bot commented Jul 19, 2025 •
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@lukastaegert lukastaegert mentioned this pull request Jul 19, 2025
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github-actions bot commented Jul 19, 2025 •
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Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#gh-6018_const_reassign

Notice: Ensure you have installed the latest stable Rust toolchain. If you haven't installed it yet, please see https://www.rust-lang.org/tools/install to learn how to download Rustup and install Rust.

or load it into the REPL:
https://rollup-hnlhm1948-rollup-js.vercel.app/repl/?pr=6020

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github-actions bot commented Jul 19, 2025 •
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Performance report

  • BUILD: 7027ms, 818 MB
    • initialize: 0ms, 24.7 MB
    • generate module graph: 2615ms, 628 MB
      • generate ast: 1366ms, 618 MB
    • sort and bind modules: 402ms, 682 MB
    • mark included statements: 4008ms, 818 MB
      • treeshaking pass 1: 2347ms, 816 MB
      • treeshaking pass 2: 470ms, 848 MB
      • treeshaking pass 3: 404ms, 820 MB
      • treeshaking pass 4: 390ms, 851 MB
      • treeshaking pass 5: 388ms, 818 MB
  • GENERATE: 993ms, 924 MB
    • initialize render: 0ms, 945 MB (+4%)
    • generate chunks: 143ms (+94ms, +191.5%), 904 MB (-3%)
      • optimize chunks: 0ms, 929 MB
    • render chunks: 740ms (-106ms, -12.5%), 905 MB
    • transform chunks: 20ms, 924 MB
    • generate bundle: 0ms, 924 MB

@codecov Codecov
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codecov bot commented Jul 19, 2025 •
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Codecov Report

❌ Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 21.74%. Comparing base (71a0bf3) to head (500b842).
⚠️ Report is 1 commits behind head on master.

Files with missing lines Patch % Lines
src/ast/nodes/AssignmentExpression.ts 83.33% 0 Missing and 1 partial ⚠️
Additional details and impacted files 
@@             Coverage Diff             @@
##           master    #6020       +/-   ##
===========================================
- Coverage   98.79%   21.74%   -77.06%     
===========================================
  Files         270      259       -11     
  Lines       10575    10214      -361     
  Branches     2821     2733       -88     
===========================================
- Hits        10448     2221     -8227     
- Misses         87     7820     +7733     
- Partials       40      173      +133

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