#prefer-namespace-keyword

#Configuration

import { defineConfig, ts } from '@rslint/core';

export default defineConfig([
  ts.configs.recommended,
  {
    rules: {
      '@typescript-eslint/prefer-namespace-keyword': 'error',
    },
  },
]);

#Rule Details

Require using namespace keyword over module keyword to declare custom TypeScript modules.

TypeScript historically allowed module keyword as a way to group related code. The newer namespace keyword was added in TypeScript 1.5 to distinguish between built-in modules and user-defined modules. While the two keywords are functionally identical, using namespace is recommended as module may cause confusion with ECMAScript modules.

Examples of incorrect code for this rule:

module Foo {}

declare module Foo {}

Examples of correct code for this rule:

namespace Foo {}

declare namespace Foo {}

declare module 'foo' {}

#Original Documentation

• typescript-eslint prefer-namespace-keyword