Angular does not compile cleanly with TypeScript 2.4

[chuckjaz]

I'm submitting a...

[x] Bug report  

Current behavior

With stricter checking and improved type inference, TypeScript 2.4 now reports errors in Angular that are not reported in 2.3.

This also produces .d.ts files that are reported as errors by 2.4 as reported here:

#17863
#17522

Expected behavior

Angular compiles cleanly with 2.4.

Minimal reproduction of the problem with instructions

Upgrade TypeScript to 2.4 and run build.sh.

[danwulff]

Was this fixed with 4.3.4? #18456

[chuckjaz]

Not yet. There were a number of improvements but not all of the PRs have landed yet nor have all of them been merged with the 4.3.x branch.

[xnnkmd]

@chuckjaz Of all the planned features for newer versions of angular, this is really what I want the most. Any idea of when Angular will work with newest typescript (2.5 currently) ?

[kiwikern]

Typescript 2.4.2 is supported now with Angular 5

[xnnkmd]

Typescript 2.4.2 is yesterdays news by now....Now we just need typescript 2.6 support :-)

[chuckjaz]

We need a change to Tsickle to support both 2.4 and 2.5 for us to be able to shift our dependency to a version of Tsickle we can use. We are working on that now. Hopefully we should get this into this weeks release. If not it should be next week.

[chuckjaz]

BTW, this is only for 2.5 support. We are still working to valid 2.6.

[IgorMinar]

this is now obsolete

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