Fix "module" external helpers output

[loganfsmyth]

Q	A
Fixed Issues	Fixes #6367
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added/Pass?
Spec Compliancy?
License	MIT
Doc PR
Any Dependency Changes?

This is an alternative to #6367 that I tries to keep things a little simpler.

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/5167/

[nicolo-ribaudo]

I actually prefer this PR, since it removes the special-casing for keyword helpers.

[Andarist]

For sure the overall code is simpler - I shouldnt be afraid restructuring the functions in build-external-helpers so much, it would certainly help to make my life simpler.

This however doesn't do good by keywordHelpers, in module they are not namespaced and we cannot keep function typeof(obj) {...} - need to rename it and export as renamed back:

export { _typeof as typeof }
function _typeof(obj) {...}

[Andarist]

havent thought about that, nice!

[Andarist]

Also I have added this if statement in order to handle exported identifiers (such as temporalUndefined) more gracefully here - while it worked because exportName was undefined in that case and therefore different than expectec helper name (id.name), it could have been a little bit by luck and not sure if the original author meant it that way. Imho handling Identifier case there makes things more explicit and therefore better.

[loganfsmyth]

@Andarist Ahh, good point about typeof. I'll fix that.

I'm not sure I follow what you're saying about temporalUndefined though.

[Andarist]

This is perfect! 🎉