Replace Biome and ESLint with oxlint and oxfmt

[devxoul]

Summary

Replace Biome (linter + formatter) and ESLint with oxlint and oxfmt from the oxc project. Biome served well but oxlint and oxfmt are faster, have better rule coverage for correctness/suspicious categories, and provide native Tailwind class sorting without plugins. This also consolidates the docs/ linting setup — instead of separate biome.json + eslint.config.mjs in docs/, a single root .oxlintrc.json with overrides handles both the main package and docs.

Changes

Tooling config

• .oxlintrc.json — Add root config: correctness rules as errors, suspicious as warnings, with overrides for docs/ to enable react, jsx-a11y, and nextjs plugin rules.
• .oxfmtrc.json — Add formatter config: 120 line width, no semicolons, single quotes, import sorting, Tailwind class sorting scoped to docs/.
• biome.json, docs/biome.json, docs/eslint.config.mjs — Delete. Fully replaced by the oxc configs above.

Dependency changes

• package.json — Remove @biomejs/biome, add oxlint + oxfmt. Update lint, lint:fix, and format scripts.
• docs/package.json — Remove eslint, eslint-config-next, eslint-plugin-tailwindcss. Update lint script to use oxlint with docs override.

Lint fixes (non-mechanical)

• src/platforms/discord/client.ts — Remove unused lastError variable that was declared but never assigned. Simplify post-retry error throw.
• src/shared/utils/concurrency.ts — Replace new Array(n) with Array.from({ length: n }) to satisfy the no-new-array correctness rule.
• src/platforms/teams/index.ts — Delete empty barrel file flagged as dead code.

Formatting (mechanical)

oxfmt applied across all source, test, doc, and skill files. Changes are whitespace/style only — no logic modifications. Roughly 180 files touched, mostly trailing newlines and quote normalization.

Testing

• Typecheck, lint, and format all pass with the new tooling.

---

Summary by cubic

Replace Biome and ESLint with oxlint and oxfmt for faster linting/formatting, better rule coverage, and native Tailwind class sorting in docs. Unifies tooling with single root configs and updates scripts without changing runtime behavior.

• Dependencies

  • Add oxlint and oxfmt.
  • Remove @biomejs/biome, and in docs/ remove eslint, eslint-config-next, eslint-plugin-tailwindcss.
  • Update scripts: lint/lint:fix/format now use oxlint/oxfmt (root and docs/).

• Refactors

  • Add .oxlintrc.json (root ignores) and .oxfmtrc.json (120 width, single quotes, no semicolons, import sorting, Tailwind class sorting scoped to docs/).
  • Remove biome.json, docs/biome.json, docs/eslint.config.mjs.
  • Apply oxfmt across the repo (style-only). Minor lint fixes, e.g. simplify retry error in src/platforms/discord/client.ts.

^{Written for commit 4ff131a. Summary will update on new commits.}

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
agent-messenger	Ignored		Mar 9, 2026 6:42am

[cubic-dev-ai]

No issues found across 183 files

Note: This PR contains a large number of files. cubic only reviews up to 75 files per PR, so some files may not have been reviewed.