Is there a way to incorporate TypeScript type definitions into a JavaScript module without fully transitioning to TypeScript?

Although the title may be a bit confusing, it encapsulates my query in a succinct manner. So, here's what I'm aiming to achieve:

  • I currently have an npm module written in JavaScript, not TypeScript.
  • Some of the users of this module prefer using TypeScript, so it would be beneficial if I could offer type annotations for my JavaScript code.
  • However, I am adamant about sticking to pure JavaScript and not transitioning to TypeScript.

Therefore, I am seeking a method for creating an external type declaration or some equivalent solution.

Is there a way to accomplish this? And if so, how can it be done?

I apologize if this question seems rudimentary to TypeScript enthusiasts; my lack of experience with TypeScript leaves me clueless on where to begin researching. Any guidance or direction regarding a terminology search would be greatly appreciated.

javascripttypescripttypes

Answer №1

One way to enhance your JavaScript code is by creating Definition Files, which describe the structure and functionality of your code.

For example, let's consider a simple function named add that can either take two numbers as arguments or an array of numbers.

To define this function in a separate file, you can create a .d.ts file within a designated folder structure like types.

In the definition file, you specify the input types and return values for the different variations of the add function, utilizing JSDoc annotations for clarity.

If you have multiple related files, you can include them using reference comments in each file and specifying their paths accordingly.

To ensure TypeScript recognizes these definitions, you must update the package.json file with information about where to locate the definition file.

Remember, organizing your definitions properly and following best practices outlined in TypeScript documentation will help maintain consistency and improve code quality.

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