Module Declarations

Code

// global.d.ts
declare module "my-lib" {
  export function greet(name: string): string;
  export const version: string;
  export interface Config {
    timeout?: number;
    retries?: number;
  }
}

declare module "*.css" {
  const content: Record<string, string>;
  export default content;
}

declare module "*.png" {
  const src: string;
  export default src;
}

declare global {
  interface Window {
    myApp: { version: string };
  }
}

Explanation

Provides types for untyped libraries or non-JS resources via declare module.

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