Navigating the proper utilization of exports and subpaths in package.json with TypeScript

As a newbie in creating npm packages using TypeScript, I've encountered some issues that I believe stem from misinterpreting the documentation. Currently, I am working with Node 16.16.0 and npm 8.13.2.

Here is the structure of my project:

src/
├─ module1/
│  ├─ index.ts
├─ module2/
│  ├─ index.ts
package.json
tsconfig.json

tsconfig.json

{
  "compilerOptions": {
    "target": "es2017",
    "module": "commonjs",
    "esModuleInterop": true,
    "declaration": true,
    "outDir": "./lib",
    "strict": true
  },
  "include": ["src"],
  "exclude": ["node_modules", "**/__tests__/*"]
}

package.json

{
  "name": "@owner/mypackage",
  "version": "v1.0.0",
  ...
  "files": [
    "lib/**/*"
  ],
  "type": "module",
  "exports": {
    "./module1": "./lib/module1/index.js",
    "./module2": "./lib/module2/index.js",
    "./package.json": "./package.json"
  }
}

After publishing the module, the generated structure is as follows:

lib/
├─ module1/
│  ├─ index.js
├─ module2/
│  ├─ index.js
package.json

This leads to an import structure like this:

import {Foo} from "@owner/mypackage/lib/module1";

However, I desire the import structure to be like this:

import {Foo} from "@owner/mypackage/module1";

Is it possible to achieve this pattern? And are there any suggestions for improvement or following best practices?

Answer №1

My personal experience with a project using Typescript 4.7+ has shown that the key to success lies in implementing the typesVersions property in the package.json file instead. (For more information, refer to https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html#version-selection-with-typesversions)

One particularly relevant quote from the documentation is worth highlighting:

If none of the fields in typesVersions are matched, TypeScript defaults to the types field, directing TypeScript 3.0 and earlier versions to [...]/node_modules/package-name/index.d.ts.

This essentially implies that if the typesVersions field is not defined in package.json, the types field is utilized. However, this becomes problematic when dealing with multiple export paths utilizing exports.

I hope this explanation clarifies things for you!

{
  "exports": {
    "./module1": "./lib/module1/index.js",
    "./module2": "./lib/module2/index.js",
  },
  "typesVersions": {
     "*": {
       "module1": ["lib/module1/index.js"],
       "module2": ["lib/module2/index.js"]
    }
  }
}

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