Feat: Add support for TypeScript 3

[alan-agius4]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[x] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question
[ ] Other... Please describe:

Current behavior

Supports up to 2.9.x

Expected behavior

Support typescript V3.

What is the motivation

Today Typescript 3 was officially released.

What’s new:
https://github.com/Microsoft/TypeScript/wiki/What%27s-new-in-TypeScript

[sarunint]

As the team had said, v6.1 will be the last planned minor release for v6.x, I think we'll see Angular with TypeScript 3.x support in Angular v7.

That's just my speculation, though.

Side note, it's quite hard to keep up with TypeScript releases because TS introduces breaking changes (to the API) even in minor releases.

[Teamop]

But currently, there's an issue with typescript 2.9.2 which breaks the auto import feature for javascript and typescript which is a little annoying for developers.
And based on the issue in vs code and microsoft/TypeScript#23230, currently the only way is to upgrade to 3.0, or just downgrade.

[VovanSuper]

Also... some bigger Angular projects are written by dedicating parts of those into Angular Libs; Ts3 brings new features ("composite", "declaration" tsconfig flags, /// directive) for such cases (afaiu), which would bring even better experience...

[mhevery]

PRs welcome.

[alan-agius4]

Most likely we'll also have to wait until tsickle supports TypeScript 3
angular/tsickle#868

[krokofant]

@alan-agius4 Why close this?

[albohlabs]

@krokofant have a look at this PR #25275

[alan-agius4]

Issue closed as PR was merged.

[krokofant]

@alan-agius4 I only see the PR as closed and not merged. 😕 Looks weird but I can see that it's merged by the commits.

[alan-agius4]

That's because it was cherry-picked.

…

On Tue, 28 Aug 2018 at 13:18, krokofant ***@***.***> wrote: @alan-agius4 <https://github.com/alan-agius4> I only see the PR as closed and not merged. 😕 — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#25200 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AQv-WnTpr5p68IIWtDbaO5qa0Zuf7weeks5uVSb5gaJpZM4VmxsL> .

[alan-agius4]

It’s currently in RC state https://github.com/angular/angular/blob/master/CHANGELOG.md#700-rc0-2018-09-28

…

On Fri, 05 Oct 2018 at 14:03, dalu ***@***.***> wrote: so which release version is ts>=3 in now? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#25200 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AQv-WgmNQROw5xkALErDyTtKPEsbKzM1ks5uh0qugaJpZM4VmxsL> .

[mhosman]

Angular 7.0 just arrived yesterday !!!

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