Use BiomeJS for linting, formatting

[drwpow]

Changes

Swaps ESLint and Prettier for Biome, a faster linter + formatter built for the JS ecosystem. I’ve been extremely happy with it on other projects, and it has better out-of-the-box default rulesets than ESLint, hands-down. Excited for a faster, easier-to-use tool for the JS ecosystem.

Prettier is still in deps, mostly because it is still needed for formatting .md and .yaml, but linting isn’t enforced there. Prettier used to used to check formatting in CI, and now it’s not thanks to Biome handling both. So Prettier is now a convenience when working in docs and nothing more.

How to Review

• CI updated; CI should pass

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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