Bundle module.js in ES5

[macobo]

Changes

Turns out dist/module.js was not bundled in es5, which would cause issues in IE11. An user pointed this out in a comment under an old commit.

This is an attempt towards fixing this + adding tests for the future.

Note: I know next to nothing about library bundling in node world, but the solution seems still less than ideal. @mariusandra do you know any libraries we could 'borrow' inspiration from on how to bundle things properly?

Checklist

• Tests for new code (if applicable)
• TypeScript definitions (module.d.ts) updated and in sync with library exports (if applicable)

[mariusandra]

Hey, this is actually how you should do it. Whenever you need to change the targeted ES version somehow, you just add babel and preferably via a bundler plugin. Everything seems fine to me!

Surprisingly, this also reduced the unminified bundle size from 170KB to 164KB. Normally adding babel makes things bigger, so this was interesting to see.

I added two quick changes 1) removed "npx" from the build script in package.json (all node_modules/.bin scripts are automatically in $PATH) and 2) I noticed when going through module.js that the full package.json was inlined, so I changed the import to just take the version.