In TypeScript, modules are TypeScript files that contain an import or export statement. If a file is not a module, it will be ignored by TypeScript. Sometimes a file doesn’t contain imports or exports for legitimate reasons. In this case, an empty export must be added. I.e. to augment an interface:

export {};

declare module '@appsemble/sdk' {
  interface Parameters {
    interval: number;
  }

  interface EventEmitters {
    interval: never;
  }
}

As soon as the file is modified to contain actual imports or exports, the empty export can be removed.

I’d like to propose a rule that reports empty exports if the file contains other imports / exports. This can be autofixable by removing the empty export. I’m willing to implement this.