Support ES modules with `@std/esm`

Support ES modules with @std/esm

PR used in this proposal: https://github.com/Turfjs/turf/pull/975

Using @std/esm seems to work perfectly with NodeJS (4+ compatible) and works well with our tape testing suite, ~unfortunately… it doesn’t like it when you use .js for ES Modules~ (Added @std/esm to fix this)

SyntaxError: 'import' and 'export' may only be used in ES modules

~😢 … Going to refactor everything back to .js => .mjs (dropping .es5.js files) once this is done, a fresh git clone would be required.~

🥇 Easy to use

When @std/esm is included as a devDependency, you can easily execute the tape tests using the following:

$ node -r @std/esm test.js
$ node -r @std/esm bench.js
$ node -r @std/esm index.js

🎉 🚀 Omg…! No Rollup pretest was required for this test to run successfully.

Publishing

The Rollup pretest will be changed to => prepublish to transpile the index.js (ES Modules) => dist/index.js (CommonJS) before publishing a new release.

❌ Not happening

• No Babel on index files
• No Rollup on test files (tests can be ES Modules or CommonJS 🎉 )

This is such a pain 😢 … (it will be worth it at the end of this madness)

CC: @Turfjs/ownership

[DenisCarriere]

@jdalton Sorry for the 17+ day response, I still haven’t forgotten about your comment. As for feedback, so far @std/esm is working out just great!

I’ll make sure to send some feedback on @std/esm issues, so far it looks great! 👍

[rowanwins]

🍻