Do type declaration files for NPM packages have to be in the .d.ts format?

I believe it is feasible to include type declarations in any typescript file like '.d.ts', '.ts', or '.tsx'.

However, I have observed that the type declaration files for most npm packages are .d.ts files.

Is this a requirement?


In my current scenario, I am only looking to have my npm package utilized by TypeScript projects, so I release my package without compilation (all .ts files).

I am uncertain if this will cause any issues?

Answer №1

When you release a package, it creates both .js and .d.ts files. This ensures that users can easily install your package in a regular JavaScript project without the need for TypeScript. They won't be able to understand .ts or .tsx files. You can simply ignore the .d.ts files when using the package alongside the .js files.

If you intend to exclusively use this package in your TypeScript projects, you'll need to instruct your bundler (such as Webpack) to compile the package with the ts-loader, since browsers cannot interpret TypeScript code on their own. Similarly, if you are working on a Node.js application, pure Node is much faster than using the ts-node compiler. It would be best to avoid unnecessary overhead in this case.

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