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fix: preserve constant identifiers in unary expressions instead of magic numbers#5968

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lukastaegert merged 5 commits intorollup:masterfrom
OmkarJ13:preserve-unary-expressions
Jun 6, 2025
Merged

fix: preserve constant identifiers in unary expressions instead of magic numbers#5968
lukastaegert merged 5 commits intorollup:masterfrom
OmkarJ13:preserve-unary-expressions

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@OmkarJ13 OmkarJ13 commented May 29, 2025 •
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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

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Description

  • This was likely a regression after PR feat: enhance the treehshaking for unary expression #5775 which caused unary expressions with constant identifiers (like !MY_CONSTANT) to be inlined with magic numbers (false), losing code readability.
  • Have added logic to check if the unary expression's argument is an identifier referencing an included variable, and if so, preserves the full expression instead of inlining the literal value
  • This helps maintain both the tree-shaking optimization benefits that the original PR added while benefits while preserving readable constant names in the output

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vercel bot commented May 29, 2025 •
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@OmkarJ13 OmkarJ13 marked this pull request as ready for review May 29, 2025 19:26
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codecov bot commented Jun 2, 2025 •
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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.77%. Comparing base (8f0dbc9) to head (a99d8f8).
Report is 2 commits behind head on master.

Additional details and impacted files 
@@           Coverage Diff           @@
##           master    #5968   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files         270      270           
  Lines        8731     8732    +1     
  Branches     1507     1508    +1     
=======================================
+ Hits         8624     8625    +1     
  Misses         73       73           
  Partials       34       34

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lukastaegert
lukastaegert approved these changes Jun 6, 2025
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I must admit it really makes a difference for readability.

@lukastaegert lukastaegert enabled auto-merge June 6, 2025 04:29
@lukastaegert lukastaegert added this pull request to the merge queue Jun 6, 2025
Merged via the queue into rollup:master with commit 224c900 Jun 6, 2025
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github-actions bot commented Jun 6, 2025

This PR has been released as part of rollup@4.41.2. You can test it via npm install rollup.

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@lukastaegert lukastaegert lukastaegert approved these changes

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Successfully merging this pull request may close these issues.

Application constants get replaced with magic number when an operator is used

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@OmkarJ13 @lukastaegert