Cache npm dependencies with setup-node

yaml

- uses: actions/setup-node@v4
  with:
    node-version: 20
    cache: npm

Explanation

Prefer first-party built-in caching support when available.

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Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing Caching dependencies

Use `actions/cache` for custom cache paths.

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