#rules

• Type: Record<string, RuleSeverity | readonly [RuleSeverity, ...options]>
• RuleSeverity: 'off' | 'warn' | 'error' | 0 | 1 | 2

Configures individual rules with a severity level and optional positional options.

Use a severity directly when a rule has no options to configure:

{
  rules: {
    '@typescript-eslint/no-explicit-any': 'error',
    '@typescript-eslint/require-await': 'off',
  },
}

Use an array to pass every item after the severity to the rule as a positional option:

{
  rules: {
    '@typescript-eslint/array-type': ['warn', { default: 'array-simple' }],
    '@typescript-eslint/no-unused-vars': [
      'error',
      {
        argsIgnorePattern: '^_',
        varsIgnorePattern: '^_',
      },
    ],
  },
}

Invalid severities and rule value shapes are rejected while the configuration is loaded.

#Merging

Later matching config entries override earlier entries. When a later entry changes only the severity, the rule keeps options from the earlier entry. Supplying any positional option in the later array replaces all earlier options.

export default defineConfig([
  {
    rules: {
      '@typescript-eslint/no-unused-vars': ['error', { args: 'all' }],
    },
  },
  {
    files: ['tests/**'],
    rules: {
      // Keeps { args: 'all' } while changing the severity.
      '@typescript-eslint/no-unused-vars': 'warn',
    },
  },
]);

See Rules & Presets for preset selection, or browse the complete Rules reference for rule-specific options.