patch-jest-cache

patches jest caching to work around an issue outstanding since 2017

Usage no npm install needed!

<script type="module">
  import patchJestCache from 'https://cdn.skypack.dev/patch-jest-cache';
</script>

README

patch-jest-cache

patches jest caching to work around an issue outstanding since 2017 cache write race condition across processes

  • make caching opportunistic: if it works, great, if it fails, c'est la vie!
    • caching should be to improve performance, not a lynchpin
  • facilitate complete disable of read and/or write cache
    • because jest writes out cache files even when invoked with --no-cache, wasting time on I/O for files that won't be used

usage

npx patch-jest-cache {options}
  • default behavior patches cache reading and writing to only warn on error
  • specify --no-warn-on-errors to suppress warning messages
  • specify --disable-read-cache or --disable-write-cache to completely disable cache read / write

reverting

either run npx patch-jest-cache --revert or re-install your node_modules, eg with npm ci