Creating a .d.ts file for a JavaScript file that exports a plain object - tips and best practices

I am attempting to include a .d.ts file for an existing js file.

The type.js file looks like this:

// type.js
export default {
    NORMAL: '001',
    CHECK: '002',
};

Now, I have added a type.d.ts file as follows:

// type.d.ts
declare namespace col_type {
    const NORMAL: string;
    const CHECK: string;
}

However, when I import type.js in my project, VSCode displays an error like this:

import TYPE from './type';

The error message reads:

File './type.d.ts' is not a module.

I am finding it difficult to understand what steps I need to take to resolve this issue.

Answer №1

The missing component in your declaration file is the necessary export statement:

declare namespace col_type {
    const PRIMARY: string;
    const SECONDARY: string;
}
export = col_type;

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