The prepare scripts (tsc --build and webpack) are most of the install time in every job, so their output is cached between runs. tsc's tsbuildinfo tracks file hashes and webpack's filesystem cache keeps its node_modules modules, so a restored cache makes both incremental.
The lint and build-mod jobs never read the compiled output: eslint is not type-aware here and build_mod.js is plain JavaScript. They now install with --ignore-scripts.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The lockfile is not committed so the usual lockfile hash key does not work. Instead the store is snapshotted whenever a package.json changes or a week passes, and every run restores the most recent snapshot through a prefix restore key. pnpm still resolves the latest versions within the ranges; the cache only saves the tarball downloads. A composite action holds the setup so the four jobs share it.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
