Exporting module files in package.json and supporting multiple type declarations

I'm in the process of creating a TypeScript library and I'd like to use the exports field in the package.json file for exporting.

After consulting nodejs and webpack's documentation, it seems that using the exports field is the recommended approach for module exports.

For more information, check out: https://nodejs.org/api/packages.html#package-entry-points

You can also refer to this link for guidance: https://webpack.js.org/guides/package-exports/

The traditional method involves utilizing the "main", "types", and "module" fields.

How do I go about exporting type declarations using this new method? Should I continue using the "types" field or is there an alternative if multiple exports are involved?

Below is an example of the export setup I currently have:

"exports": {
    ".": {
      "import": "./dist/A.mjs",
      "require": "./dist/A.js"
    },
    "./A": {
      "import": "./dist/A.mjs",
      "require": "./dist/A.js"
    },
    "./B": {
      "import": "./dist/B.mjs",
      "require": "./dist/B.js"
    }
  }

Answer №1

When working with exports in Node.js, you may encounter issues with TypeScript support unless you configure moduleResolution to use bundler/nodenext etc... The Apollo library tackles this by creating a separate package.json for each exported path, as demonstrated here.

Therefore, in the package.json file, exports are essential for compiled JavaScript code, while an additional package.json is necessary for TypeScript during development.

For a more in-depth discussion on this topic, check out my article here, which includes sample code.

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