List of loaders in the wild today

[cspotcode]

The goal of this issue is to track a list of loaders used in the wild today. Eventually, we will need to decide how loaders compose and interop. It will be helpful to keep track of what loaders are doing today so we understand how to support their use-cases.

This list is very short to start, but I'll do my best to ask around in forums and mention this issue to the authors.

Yarn2 PnP

• Currently in a draft PR
• Issue: 🎯 ESM Support for PnP yarnpkg/berry#638
• Pull request: feat(pnp): experimental esm support yarnpkg/berry#2161
• Author is waiting to see how node design work proceeds: feat(pnp): experimental esm support yarnpkg/berry#2161 (comment)

ts-node

• First released in v8.10.0 as an experimental feature to match node's experimental status
• Documentation, feedback, Q&A in this thread: ESM support: soliciting feedback TypeStrong/ts-node#1007

@istanbuljs/esm-loader-hook

• NPM
• I don't know if this is commonly used. I need to ask the authors

Jest

• Docs
• Issue: Meta: Native support for ES Modules jestjs/jest#9430

multiloader

• Compose multiple loaders into one
• https://github.com/targos/multiloader

quibble

• used by the mocking library testdouble for mocking ESM
• https://github.com/testdouble/quibble

babel-register-esm

• babel transpiler hook
• https://github.com/giltayar/babel-register-esm

[cspotcode]

I should also add to this list CommonJS loaders that cannot be implemented as ESM loaders, because they indicate features which should be added to the ESM loader APIs.

[giltayar]

The quibble loader, which is used by the mocking library testdouble for mocking ESM: https://github.com/testdouble/quibble.

Used in "production" by a variety of developers.

Accompanying article describing how it works: https://dev.to/giltayar/mock-all-you-want-supporting-es-modules-in-the-testdouble-js-mocking-library-3gh1

[giltayar]

babel-register-esm: https://github.com/giltayar/babel-register-esm, which is a loader we use at our company that transpiles source code according to the babel configuration.

[GeoffreyBooth]

Do you mind opening a PR to add this info to https://github.com/nodejs/loaders/blob/main/doc/resources.md?

[cspotcode]

Yes, I'll do that, I didn't notice that list before creating this PR. My mistake.

[giltayar]

Of course. Although I did notice you put my blog post in there. :-)

[giltayar]

PR #10 for babel-register-esm