Provide an ES6 build

Status Update

• ESM build is provided as part of the npm package beginning from version 5.0.0
  • Thanks @EqualMa 👍
  • See: #986
• This esm build is not bundled, providing a bundled esm build will be evaluated depending on JavaScript library development best practices and end users requests.

Original Issue by @mugen87 below:

We are using chevrotain for our new VRMLLoader in three.js (see https://github.com/mrdoob/three.js/pull/16726). Since we currently migrate our official examples to an ES6 module code base, it would be great if all external libraries provide a respective module file, too. In this particular case, something like chevrotain.module.js 😊

[bd82]

Devs do not always use npm to install dependencies or want to configure a build. I think it makes a library easier to use if it is accessible over UMD or ESM bundle files. That’s the reason why I would love to see chevrotain.module.js^^.

I agree that is why Chevrotain is already providing a UMD build (both minified and unminified).

• https://unpkg.com/chevrotain@4.8.1/lib/chevrotain.min.js
• https://unpkg.com/chevrotain@4.8.1/lib/chevrotain.js

I think the first step would be to provide an esm + es5 + un-bundled artifact. which can be accomplished without any new tooling (by using TSC).

The second step would be to investigate farther how common it is to also provide bundled esm modules in the JavaScript eco-system and if it considered a good/best practice try to implement that as well.

I think we can run the tests for the esm bundles using --experimental-modules CLI argument on modern version of node.js.

[bd82]

closing this, will be tracked in: #1383