Including .d.ts files in TypeScript files

I am facing an issue with importing types from a .d.ts file that I created. The TypeScript compiler is giving an error related to the file path, displaying this message:

File '.../lib/types/generated.d.ts' is not a module.ts(2306)

The error occurs at the beginning of a .ts file where I am trying to import the type:

import type { CategoryForm } from '../../lib/types/generated';

This file includes the following content:

...
declare namespace App.DTO.Category {
export type CategoryData = {
id: string;
parent_id: string | null;
name: string;
slug: string;
category_type: App.Enums.CategoryType;
created_at: string;
updated_at: string;
};
export type CategoryForm = {
parent_id: string | null;
name: string;
category_type: App.Enums.CategoryType;
};
}
...

I have tried multiple ways to import the type without success. What could be the issue here?

I have attempted different approaches to importing the type but none seem to work. Any suggestions on how to resolve this would be appreciated.

Answer №1

If you are seeing the error message "File '.../lib/types/generated.d.ts' is not a module.ts(2306)," it usually means that TypeScript is looking for a module but cannot find one in the specified path. To resolve this issue, make sure that the .d.ts file explicitly declares itself as a module if it is being used as one.

To declare the file as a module, add a module declaration to your generated.d.ts file. This will clearly indicate to TypeScript that the file should be treated as a module. Here's an example of how you can do this:

declare module 'yourModuleName' {
  export namespace App.DTO.Category {
    // ... define your types here ...
  }
}

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