How to Create a Typescript Library with both Default and Named Exports?

Question

How to Create a Typescript Library with both Default and Named Exports?

I've been enjoying exploring the different ways React can be imported, from using import React from 'react' to importing specific components with destructuring like

import { useEffect } from 'react'

, or even cheekily doing

import * as Whatever from 'react'

. Now I'm on a mission to create my own TypeScript library for npm that can be imported in all these ways, along with the traditional require syntax. I've put in around 15 hours so far, but haven't quite cracked it (frustrating).

Currently, I'm utilizing rollup to build lib/cjs and lib/esm to support both CommonJS and Modules. Additionally, typescript-compiler (tsc) is generating type files stored inside /lib/types.

However, my biggest roadblock is figuring out how to export my files similarly to how React does it. At the moment, I'm using an index.ts "barrel file" at the root of my library, which looks something like this:

export * from './filename1' export * from './filename2' ...

But this setup doesn't include a default export for my library. Do I need to perform some sort of magic with an index.d.ts module declaration? Any advice or tutorials on creating a TypeScript library would be greatly appreciated. While I've managed to make either default imports or named imports work for my library individually, I'm struggling to get them both working together.

typescript commonjs rollupjs transpiler npm-publish

Answer 1

Answer №1

If you prefer, you have the option to import all modules initially and subsequently utilize export default to globally export them.

import * as module1 from './module1';
import * as module2 from './module2';

export default {
  ...module1,
  ...module2
};

Is this approach suitable for your needs?

Answer 2

If you prefer, you have the option to import all modules initially and subsequently utilize export default to globally export them.

import * as module1 from './module1';
import * as module2 from './module2';

export default {
  ...module1,
  ...module2
};

Is this approach suitable for your needs?

Answer 3

Answer №2

This is a helpful tip for combining exports and default export in one file. By merging the contents of two modules, you can create a default object that includes both sets of functionality.

import * as module1 from './module1';
import * as module2 from './module2';

// Create a new object by merging module1 and module2
const defaultObject = Object.assign({}, module1, module2);

export default defaultObject;
export * from './module1';
export * from './module2';

Answer 4

This is a helpful tip for combining exports and default export in one file. By merging the contents of two modules, you can create a default object that includes both sets of functionality.

import * as module1 from './module1';
import * as module2 from './module2';

// Create a new object by merging module1 and module2
const defaultObject = Object.assign({}, module1, module2);

export default defaultObject;
export * from './module1';
export * from './module2';

How to Create a Typescript Library with both Default and Named Exports?

Answer №1

Answer №2

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