Creating a declaration file for a library's entry point involves outlining the structure and types

I have developed an npm library that is made up of several ES6 modules, which are then consolidated into a single js file. The directory structure looks like this:

src
  main.ts
  one.ts
  two.ts
  three.ts
  types
    index.d.ts
index.ts

The index.ts file imports main.ts and exports it as the entry point for the library.

When I bundle the files, d.ts files are automatically generated for each module and placed nearby like so:

two.ts
two.d.ts

I've noticed in other libraries that there is only one index.d.ts file for the library entry point. How can I make sure declaration files are generated only for the entry point and not for individual ES6 modules?

Additionally, I store all my interfaces in a separate file and import them when needed. For example:

import { someInterface } from './types'

const something: someInterface

However, these imports show up in autogenerated d.ts files like this:

import { someInterface } from './types';
declare class someClass {
    someVar: string;
}

I would prefer the someInterface to be included directly as text, rather than as an import statement.

Am I approaching this situation incorrectly?

Answer №1

After solving all the details, I realized that to create a single d.ts file for the library entrypoint, I had to set up a separate npm package. To achieve this, I made use of dts-bundle-generator.

To integrate it with webpack and run it after generating the original d.ts files for each module, I incorporated webpack-shell-plugin-next.

Here's how you can do it:

// webpack.config.js
    
...
plugins: [
    new WebpackShellPluginNext({
      onBuildEnd: {
        scripts: ['node ./node_modules/.bin/dts-bundle-generator -o dist/myLib.d.ts src/main.ts'],
        blocking: false,
        parallel: true,
      },
    }),
  ],
...

This process results in the creation of a single d.ts file for the library entrypoint.

Furthermore, for imported interfaces, make sure to import and export them from main.ts so that the d.ts generator can include them as text, rather than imports.

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