JS module declaration does not identify as a file module

Check out this link for the Angular project

If you take a look at src/mock-data/mock-data.js, you'll see that it's quite large but very straightforward.

System.register([], function (exports) {
  mockdata = {......};
  exports("MockData", mockdata);
});

In my TypeScript module src/app/table-view.ts, I decided to consume it like this:

import { MockData } from 'mockdata/mock-data';

However, when I tried to import the JS module, TypeScript gave me an error message stating that using implicit 'any' objects is not allowed unless there is a typed declaration available. This goes against the guidelines of the Angular 2 quickstart guide.

Initially, I thought about using require() to import the module as suggested by some sources. However, this resulted in an error "cannot find name: require".

So, I created a declaration file: src/mock-data/mock-data.d.ts

declare module 'MockData' {
  var mockdata: any;
  export = mockdata;
}

This declaration is similar to others found online, such as this one. However, even after creating the declaration file, TypeScript continued to show the error TS2306: File ...mock-data.d.ts is not a module! What could be causing this issue?

Where can I find a proper explanation on how to consume a JavaScript module in TypeScript, especially when dealing with a module that only consists of a single untyped object?

Answer №1

Here is the correct declaration:

declare const MockData: any;

This mock-data.d.ts file defines the identifier MockData, which is used to export data in my mock-data.js file.

I found this solution on https://www.typescriptlang.org/docs/handbook/modules.html. It's worth noting that the "declare" keyword was not necessary in my specific case, as explained in the "UMD modules" section of the documentation.

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