biome.jsonc

{
  "$schema": "https://biomejs.dev/schemas/2.5.13/schema.json",
  // Biome replaces eslint, eslint-config-chartjs and eslint-plugin-es here.
  // The formatter settings below are the eslint-config-chartjs style rules
  // (2-space indent, single quotes, semicolons, no spacing inside braces),
  // so that adopting the formatter is not also a restyling of the sources.
  "files": {
    "includes": [
      "**/*.js",
      "**/*.mjs",
      "**/*.ts",
      "**/*.json",
      "**/*.jsonc",
      "!package-lock.json",
      // Emitted from the JSDoc by `npm run types`, not edited by hand.
      "!types/generated"
    ]
  },
  "formatter": {
    "enabled": true,
    "indentStyle": "space",
    "indentWidth": 2,
    // eslint had `max-len` off; this only wraps what is already very long.
    "lineWidth": 120
  },
  "javascript": {
    "formatter": {
      "arrowParentheses": "always",
      // object-curly-spacing: never
      "bracketSpacing": false,
      // quotes: single, avoidEscape
      "quoteStyle": "single",
      // semi: always
      "semicolons": "always",
      // comma-dangle: only-multiline -- never adding one keeps the diff small
      "trailingCommas": "none"
    }
  },
  "json": {
    "formatter": {
      "trailingCommas": "none"
    }
  },
  "linter": {
    "enabled": true,
    "rules": {
      "preset": "recommended",
      "complexity": {
        // eslint: complexity [2, 10]. Cognitive complexity is a different
        // measure, so the threshold is not the same number.
        "noExcessiveCognitiveComplexity": {
          "level": "warn",
          "options": { "maxAllowedComplexity": 15 }
        }
        // These were off while the sources were ES5 (`var`, `arguments`,
        // string concatenation). The Vitest rewrite has no such code left, so
        // they are on: recommended defaults, nothing added.
      },
      "style": {
        // eslint: curly [2, all]
        "useBlockStatements": "error"
      },
      "suspicious": {
        // eslint: no-console [2, {allow: [warn, error]}]
        "noConsole": {
          "level": "error",
          "options": { "allow": ["warn", "error"] }
        },
        // `isNaN` and `Number.isNaN` do not answer the same question: the
        // global coerces, and the matchers rely on that.
        "noGlobalIsFinite": "off",
        "noGlobalIsNan": "off",
        // The code already uses the safe `Object.prototype.hasOwnProperty.call`
        // form; the rule only wants the newer `Object.hasOwn`.
        "noPrototypeBuiltins": "off"
      }
    }
  },
  "overrides": [
    {
      // Ported from 0.5.0 with only the Image guard changed, and kept diffable
      // against that version. The optional-chain rewrite of `text && text.charCodeAt`
      // is equivalent here only because the loops iterate over `text.length`,
      // which is not a property of the guard worth relying on in a port.
      "includes": ["src/spriting.js"],
      "linter": {
        "rules": {
          "complexity": { "useOptionalChain": "off" }
        }
      }
    }
  ],
  "assist": {
    "actions": {
      "source": {
        "organizeImports": "on"
      }
    }
  }
}