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

npm install rollup/rollup#max-parallel-file-ops-1000

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-bhyccbd84-rollup-js.vercel.app/repl/?pr=5992

Performance report

• BUILD: 7146ms, 824 MB (+2%)
  • initialize: 0ms, 24.7 MB
  • generate module graph: 2636ms, 633 MB
    • generate ast: 1397ms, 621 MB
  • sort and bind modules: 405ms, 692 MB (+3%)
  • mark included statements: 4099ms, 824 MB (+2%)
    • treeshaking pass 1: 2364ms, 825 MB (+3%)
    • treeshaking pass 2: 483ms, 838 MB
    • treeshaking pass 3: 420ms, 826 MB (+2%)
    • treeshaking pass 4: 403ms, 843 MB
    • treeshaking pass 5: 398ms, 824 MB (+2%)
• GENERATE: 830ms (+124ms, +17.6%), 919 MB
  • initialize render: 0ms, 864 MB (+7%)
  • generate chunks: 186ms (+139ms, +293.7%), 836 MB
    • optimize chunks: 0ms, 822 MB
  • render chunks: 643ms, 894 MB
  • transform chunks: 20ms, 919 MB
  • generate bundle: 0ms, 919 MB

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.78%. Comparing base (37d1915) to head (843291c).
Report is 1 commits behind head on master.

@@           Coverage Diff           @@
##           master    #5992   +/-   ##
=======================================
  Coverage   98.78%   98.78%           
=======================================
  Files         270      270           
  Lines        8744     8745    +1     
  Branches     1512     1512           
=======================================
+ Hits         8638     8639    +1     
  Misses         73       73           
  Partials       33       33           

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After updating vite I also ran into this issue. Setting

    chunkSizeWarningLimit: 1000,
    rollupOptions: {
      maxParallelFileOps: 1000, // make lower if "Too many open files" errors on Windows
      input: {
        main: 'index.html',
      }
    }

had no effect but pinning back to 4.43.0 'resolved' it.

   "pnpm": {
    "overrides": {
      "rollup": "4.43.0"
    }
  }

This PR has been released as part of rollup@4.44.1. You can test it via npm install rollup.