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

npm install rollup/rollup#fix/config-import-attributes-key

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-44d092beq-rollup-js.vercel.app/repl/?pr=5743

Performance report

• BUILD: 8128ms, 727 MB
  • initialize: 0ms, 26.6 MB
  • generate module graph: 3114ms, 553 MB
    • generate ast: 1496ms, 546 MB
  • sort and bind modules: 446ms, 592 MB
  • mark included statements: 4571ms, 727 MB
    • treeshaking pass 1: 1537ms, 694 MB
    • treeshaking pass 2: 740ms, 723 MB
    • treeshaking pass 3: 295ms, 724 MB
    • treeshaking pass 4: 272ms, 723 MB
    • treeshaking pass 5: 316ms, 726 MB
    • treeshaking pass 6: 261ms, 733 MB
    • treeshaking pass 7: 243ms, 731 MB
    • treeshaking pass 8: 236ms, 736 MB
    • treeshaking pass 9: 217ms, 733 MB
    • treeshaking pass 10: 220ms, 731 MB
    • treeshaking pass 11: 216ms, 727 MB
• GENERATE: 890ms, 978 MB
  • initialize render: 0ms, 870 MB
  • generate chunks: 86ms, 876 MB
    • optimize chunks: 0ms, 873 MB
  • render chunks: 780ms, 957 MB
  • transform chunks: 19ms, 978 MB
  • generate bundle: 0ms, 978 MB

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.00%. Comparing base (a0f1dcc) to head (099cb2a).
Report is 1 commits behind head on master.

@@           Coverage Diff           @@
##           master    #5743   +/-   ##
=======================================
  Coverage   99.00%   99.00%           
=======================================
  Files         258      258           
  Lines        8070     8072    +2     
  Branches     1360     1361    +1     
=======================================
+ Hits         7990     7992    +2     
  Misses         53       53           
  Partials       27       27           

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It seems that there is a compatibility issue between higher versions of Node and nyc, and I haven’t found the exact problem yet. So, I temporarily used version 22.0.0.

I found the minimum incompatible Node.js version: 22.7.0. The issue was caused by PR (nodejs/node#53619), though I feel this might ultimately need to be resolved within the nyc package. As a temporary workaround, enable option --no-experimental-detect-module to avoid the problem.

This PR has been released as part of rollup@4.28.0. You can test it via npm install rollup.