[trleo]

Exported destructuring declarations could produce invalid output in non-ES formats. The bug is broader than the reported default case: any exported variable in a destructuring pattern was rendered invalidly because Identifier.render used the base qualified name in binding positions.

The fix renders binding identifiers with the plain name and uses a live getter for reassigned pattern variables, so exports stay live.

Fixes #6646

Trleo

[vercel]

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[github-actions]

Thank you for your contribution! ❤️

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

npm install trleo/rollup#fix/rollup-6646-destructuring-default-export

Notice: To build the native dependencies, you need Rustup installed; the required nightly toolchain is then picked up automatically from rust-toolchain.toml.

[lukastaegert]

Thank you for your fix. I took the liberty to slightly simplify it and also reduce the huge amount of comments and extend test coverage.

[vercel]

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Project	Deployment	Actions	Updated
rollup	Ready	Preview	Nov 8, 2026 7:13am UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.33%. Comparing base (ca871b2) to head (fda5487).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6648   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files         380      380           
  Lines       14070    14081   +11     
  Branches     3007     3011    +4     
=======================================
+ Hits        13836    13847   +11     
  Misses        192      192           
  Partials       42       42           

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[github-actions]

Performance report

• BUILD: 5887ms, 855 MB
  • initialize: 0ms, 24.1 MB
  • generate module graph: 2033ms, 631 MB
    • generate ast: 1072ms, 619 MB
  • sort and bind modules: 402ms, 692 MB
  • mark included statements: 3445ms, 855 MB
    • treeshaking pass 1: 1882ms, 830 MB (-2%)
    • treeshaking pass 2: 436ms, 845 MB
    • treeshaking pass 3: 381ms, 830 MB
    • treeshaking pass 4: 370ms, 830 MB
    • treeshaking pass 5: 369ms, 855 MB
• GENERATE: 572ms, 887 MB
  • initialize render: 0ms, 855 MB
  • generate chunks: 40ms, 834 MB
    • optimize chunks: 0ms, 837 MB (-2%)
  • render chunks: 511ms, 860 MB
  • transform chunks: 20ms, 887 MB
  • generate bundle: 0ms, 887 MB

[github-actions]

This PR has been released as part of rollup@4.68.1. You can test it via npm install rollup.