Provide es module source and/or join forces?

[Thomas Allmer]

hey,

I would like to import this plugin as an es module
so I can do something like this:

import { chaiDom } from 'chai-dom';

window.chai.use(chaiDom);

as an example for a diffrent plugin see https://github.com/open-wc/open-wc/blob/master/packages/testing/register-plugins.js

possible solutions:

1. convert to es module
   • in file index.js? or src/index.js?
   • possibly also es6
   • rollup config to create an umd module in chai-dom.js (will be full compatible)
   • will require a fast npm run build before publishing
   • I can make a MR if wanted
2. publish separately as a bundled es module
   • no change from you side
   • separate repo having a depency on chai-dom and using rollup to create an es module version (we already did that for other stuff see https://github.com/bundled-es-modules)
   • not ideal but workable
3. integrate directly in open-wc monorepo (you wann join the team?)
   • could be a "fork" @open-wc/chai-dom only exposing es module (e.g. to reduce complexity)
   • could be a next major version of chai-dom (only es module to reduce complexity)
   • could be a fully compatible version of chai-dom using rollup (if really needed)

If #7 still holds true just let me know and will move forward with 2) - although for obvious maintainability reasons I would prefer 1) or 3) but just let me know

[Nathan Black]

Just drop the brackets. I have no build system now so why should I introduce such complexity for no benefit? No tree shaking would be possible still, and as a testing library, size is not an issue.

import chaiDom from 'chai-dom'
window.chai.use(chaiDom)

[Thomas Allmer]

import chaiDom from 'chai-dom'
window.chai.use(chaiDom)

that only works when using a build tool for the tests right?

if you use this directly in the browser it will fail as chai-dom is an umd module and not a native es module... and browsers can't es import umd modules.

I can totally understand if you do not want to do this - feel free to close the issue.

[Nwel]

@nathanboktae I've exactly the same use case as @daKmoR described here: no build tools, I only use ESM in the browser. So, in order to experiment this, I created a small gist and it works just fine.

From my point of view, It would be possible for chai-dom to move to ESM the same way, and then to easily generate AMD and CommonJS using, for example, Babel (ESM to AMD & ESM to CommonJS)

FYI, I tried some workarounds before that (like using @polymer/esm-amd-loader) but failed to make them works.

[Nathan Black]

On second thought, yes it'd be nice to join the ES module train. I'll have to break down and have some build tools. Previously with UMD I didn't need to :)