biome.jsonc

{
  "$schema": "https://biomejs.dev/schemas/1.9.0/schema.json",
  "vcs": {
    "enabled": true,
    "clientKind": "git",
    "useIgnoreFile": true
  },
  "formatter": {
    "useEditorconfig": true,
    // The above does not seem to be working yet, so let's repeat the relevant contents here
    // TODO: On Biome update see if this can be removed
    "indentStyle": "space"
  },
  "javascript": {
    "formatter": {
      "quoteStyle": "single"
    }
  },
  "linter": {
    // Base configuration for Node environment config, scripts and tests and third party code
    "ignore": ["ext/**"],
    "rules": {
      "recommended": true,
      "style": {
        // Useful when used sparingly, e.g: don't double check tsconfig noUncheckedIndexedAccess
        "noNonNullAssertion": "off"
      }
    }
  },
  "overrides": [
    // Make Biome format this like npm, see: https://github.com/biomejs/biome/issues/2763
    // TODO: On Biome update see if this can be removed
    {
      "include": ["package.json"],
      "formatter": {
        "lineWidth": 1
      }
    },
    // Source code
    {
      "include": ["index.*", "livery-*.ts", "src/**/*.ts", "test/**/*.ts"],
      "linter": {
        "rules": {
          // Let's be strict, including all rules ported from sonarjs and unicorn eslint plugins, etc.
          "all": true,
          "correctness": {
            // TypeScript is better at checking this
            "noUndeclaredVariables": "off"
          },
          "nursery": {
            "useConsistentMemberAccessibility": "error"
          },
          "style": {
            // Don't require strict pascal case for compatibility with DOM types like HTMLElementTagNameMap
            // and we also frequently deal with third party names for Analytics properties and XML attributes, etc.
            // TODO: Only disable this check where needed; but that's painful without block level biome-ignore support
            "useNamingConvention": "off"
          }
        }
      }
    },
    // Test code
    {
      "include": ["test/**/*.ts"],
      "linter": {
        "rules": {
          "style": {
            // Naming of our test files matches the file to be tested, p.e: Foo.ts and Foo.test.ts; not foo.test.ts
            "useFilenamingConvention": "off"
          }
        }
      }
    }
  ]
}