Implement export as namespace from

[Kingwl]

Fixes (a part of) #4813

[ExE-Boss]

This only addresses half of #4813. The other half being export default from, which is currently at stage 1. (unless it got moved to a separate issue)

[Kingwl]

up🙆🏻‍♂️

[Kingwl]

Could we get this down in 3.8?🤔

[weswigham]

@Kingwl can ya sync it with master?

[DanielRosenwasser]

@typescript-bot pack this

[DanielRosenwasser]

I merged from master to fix conflicts, and I switched some of your tests to target multiple module outputs to avoid duplication (side note: I ran into #35809 while doing this which was annoying).

One thing I noticed was that you need a transform for es2015.

[weswigham]

@typescript-bot pack this again now that it's up to date

[DanielRosenwasser]

This needs to be transformed into something like

import*as_nsfrom'./0';export{_nsasns};

[DanielRosenwasser]

I implemented export * as ns in ES2015, and renamed the transform and file appropriately. I think we should be good to go! 🚀

[DanielRosenwasser]

@typescript-bot pack this

[typescript-bot]

Heya @DanielRosenwasser, I've started to run the tarball bundle task on this PR at ed4f9b5. You can monitor the build here. It should now contribute to this PR's status checks.

[typescript-bot]

Hey @DanielRosenwasser, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
"devDependencies": {
"typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/58409/artifacts?artifactName=tgz&fileId=C6440FA6CB5A138B28E2E5FE06AB428E11B9ED8E53FA33F05A6591C86C5DED9202&fileName=/typescript-3.8.0-insiders.20191220.tgz"
}
}

and then running npm install.

[DanielRosenwasser]

Thank you!!