Article: speed up ESLint

quick-lint / quick-lint-js

quick-lint-js finds bugs in JavaScript programs

https://quick-lint-js.com

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Article: speed up ESLint #681

Open strager opened 2 years ago

strager commented 2 years ago

Some ideas:

[ ] avoid 'npx' and 'npm run'
[ ] --cache
[ ] profile slow rules (TIMING=1)
[ ] switch parser and tweak options
[ ] deduplicate rules with TypeScript and Prettier
[ ] replace rules with quick-lint-js (e.g. #682)
[ ] .json config instead of .js config
[ ] run in your editor with LSP
[ ] reduce startup time with LSP? js-nailgun? v8 cache?

strager commented 1 year ago

One technique is to use jest-runner-eslint to parallelize ESLint across files: https://github.com/eslint/eslint/issues/3565#issuecomment-1075309795

strager commented 1 year ago

Profiling ESLint on Prettier with Chrome's about://inspect:

$ time EFF_NO_LINK_RULES=true ~/tmp/Projects/nvm/versions/node/v18.6.0/bin/node --enable-source-maps --inspect-brk ./node_modules/.bin/eslint . --format friendly

It shows that NodeEventGenerator.applySelector is the hottest function (39% of wall time). parse (Espree) only took 8% of wall time.