python3 ~/.claude/skills/biome-validator/scripts/validate.py --root .
python3 ~/.claude/skills/biome-validator/scripts/validate.py --root . --strict

{
  "$schema": "https://biomejs.dev/schemas/2.3.11/schema.json"
}

{
  "$schema": "https://biomejs.dev/schemas/1.9.0/schema.json"
}

// GOOD: v2.3+
"@biomejs/biome": "^2.3.0"

// BAD: v1.x or v2.0-2.2
"@biomejs/biome": "^1.9.0"

{
  "linter": {
    "enabled": true,
    "rules": {
      "recommended": true,
      "suspicious": {
        "noExplicitAny": "warn"
      }
    }
  }
}

{
  "assist": {
    "actions": {
      "source": {
        "organizeImports": "on"
      }
    }
  }
}

{
  "organizeImports": {
    "enabled": true
  }
}

{
  "linter": {
    "domains": {
      "react": "on",
      "next": "on"
    }
  }
}

// biome-ignore lint/suspicious/noExplicitAny: legacy code
// biome-ignore-all lint/style/useConst
// biome-ignore-start lint/complexity
// biome-ignore-end

// @ts-ignore  // Not Biome
// eslint-disable  // Wrong tool

{
  "linter": {
    "rules": {
      "correctness": {
        "noUndeclaredVariables": "error",
        "useAwaitThenable": "error"
      }
    }
  }
}

{
  "assist": {
    "actions": {
      "source": {
        "organizeImports": "on",
        "useSortedKeys": "on"
      }
    }
  }
}

{
  "linter": {
    "domains": {
      "react": "on",       // React-specific rules
      "next": "on",        // Next.js rules
      "test": "on"         // Testing framework rules
    }
  }
}

{
  "$schema": "https://biomejs.dev/schemas/2.3.11/schema.json",
  "assist": {
    "actions": {
      "source": {
        "organizeImports": "on"
      }
    }
  },
  "linter": {
    "enabled": true,
    "rules": {
      "recommended": true,
      "complexity": {
        "noForEach": "off"
      },
      "style": {
        "noNonNullAssertion": "off"
      },
      "suspicious": {
        "noArrayIndexKey": "off",
        "noExplicitAny": "warn"
      },
      "correctness": {
        "useAwaitThenable": "error",
        "noLeakedRender": "error"
      }
    },
    "domains": {
      "react": "on",
      "next": "on"
    }
  },
  "formatter": {
    "enabled": true,
    "indentStyle": "space",
    "indentWidth": 2,
    "lineWidth": 100
  },
  "javascript": {
    "formatter": {
      "quoteStyle": "single",
      "trailingCommas": "es5",
      "semicolons": "always"
    }
  },
  "files": {
    "ignore": [
      "node_modules",
      "dist",
      "build",
      ".next",
      "out",
      ".cache",
      ".turbo",
      "coverage"
    ]
  }
}

=== Biome 2.3+ Validation Report ===

Package Version: @biomejs/biome@2.3.11 ✓

Configuration:
  ✓ Schema version: 2.3.11
  ✓ Linter enabled with recommended rules
  ✓ Using assist.actions for imports
  ✗ No domains configured (consider enabling react, next)
  ✓ Formatter configured

Rules:
  ✓ noExplicitAny: warn
  ✓ useAwaitThenable: error
  ✗ noLeakedRender not enabled (recommended)

Summary: 2 issues found

bun remove eslint prettier eslint-config-* eslint-plugin-*
bun add -D @biomejs/biome@latest

bunx biome init

bunx biome migrate eslint --write

{
  "scripts": {
    "lint": "biome lint .",
    "lint:fix": "biome lint --write .",
    "format": "biome format --write .",
    "check": "biome check .",
    "check:fix": "biome check --write ."
  }
}

rm .eslintrc* .prettierrc* .eslintignore .prettierignore

// .vscode/settings.json
{
  "editor.formatOnSave": true,
  "editor.defaultFormatter": "biomejs.biome",
  "editor.codeActionsOnSave": {
    "source.organizeImports.biome": "explicit",
    "quickfix.biome": "explicit"
  }
}

# .github/workflows/lint.yml
- name: Validate Biome Config
  run: |
    python3 ~/.claude/skills/biome-validator/scripts/validate.py \
      --root . \
      --strict \
      --ci

- name: Lint
  run: bunx biome check --error-on-warnings .