Biome Documentation

Official docs for Biome — one toolchain for your web project (formatter, linter, and more).

CRITICAL: grep references/ for keywords before answering. Lint rules are at references/linter/rules/.

Reference Index (546 docs)

Linter Rules (473 docs)

• references/linter/ — Linter overview and configuration
• references/linter/rules/ — Individual rule docs organized by category:
  • a11y — Accessibility rules (useAltText, useAriaProps, etc.)
  • complexity — Complexity rules (noBannedTypes, noExcessiveCognitiveComplexity, etc.)
  • correctness — Correctness rules (noUnusedVariables, noConstAssign, useExhaustiveDependencies, etc.)
  • nursery — Experimental/new rules
  • performance — Performance rules (noAccumulatingSpread, noBarrelFile, noDelete, etc.)
  • security — Security rules (noDangerouslySetInnerHtml, noGlobalEval, etc.)
  • style — Style rules (useConst, noVar, useTemplate, useImportType, etc.)
  • suspicious — Suspicious code rules (noDoubleEquals, noExplicitAny, noDebugger, etc.)