What are the optimal methods for structuring NPM module exports within a TypeScript library project?

Currently, I am in the process of developing a library package using Typescript that will eventually be published to the npm registry for use by various projects.

To ensure that type definitions are also exported along with the code, I have followed the guidelines outlined in the publishing documentation, where the --declaration option is set to true for tsc resulting in the creation of *.d.ts files.

However, I have noticed that these exports are spread across different folders and users of my package need to import them as shown below:

import { FooType } from 'my-test-pacakge/dist/src/foo/types';
import { BarInterface } from 'my-test-package/dist/src/foo/bar';

I find this approach a bit messy and I am considering creating a custom declaration file to better organize them. Is it acceptable to structure the imports this way, or should I implement a more streamlined solution for consumers?

Some suggestions online propose exporting the API through a general index.ts file, which seems like a valid option. However, I am uncertain if importing directly from the dist folder is frowned upon in terms of best practices. What do you think?

Answer №1

It is common practice for most packages to export from a single point, allowing users of the library to access functionality without needing to understand the internal directory structure.

import { FooType, BarInterface } from 'my-test-package'.

This approach also provides the benefit of being able to reorganize the package internally without impacting end-users. It clearly defines what should be used externally and what is meant for internal use only.

Therefore, it can be considered a best practice.

While some packages may have additional namespacing, such as the mysql2 package which has two major exports:

import { Connection } from 'mysql2';
import { Connection } from 'mysql2/promise';

It is important to note that terms like dist are not relevant or meaningful to end-users.

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