What is the !: in typescript?

Asked Sep 05 '22 at 09:56

Active Sep 05 '22 at 10:16

Viewed 50 times

I started learning typescript some days back and I got into this Angular project online.

When I declared a variable like so: initPoint: Date; within a class, vs-code highlighted this as an error initPoint is not initialize and the suggested quick fix was initPoint!: Date.

So my question is, what is this !: and why does it work but initPoint: Date | undefined does not work? I don't actually know if this !: is typescript or angular - since I am completely new to both.

asked Sep 05 '22 at 09:56

mulfranck

@MoxxiManagarm I am not the question author, but it doesn't. That question is about `!` in expressions, this one is about `!` in property declaration. I can't find any relevant answers there either. – Alexey Romanov Sep 05 '22 at 10:01
3

@AlexeyRomanov here is a proper dup target: https://stackoverflow.com/questions/57816914/exclamation-mark-in-type-definition – Tobias S. Sep 05 '22 at 10:09
@TobiasS. Great! Do you know if the current wrong target can be fixed? – Alexey Romanov Sep 05 '22 at 10:12
@AlexeyRomanov - I guess only reopeing and closing again would fix it – Tobias S. Sep 05 '22 at 10:13
@TobiasS. Done. – Alexey Romanov Sep 05 '22 at 10:17
This is still a answer you can easily find by using the search function. No need for score-hunting answers. I helped you voting to reopen to change the duplicate target, unfortunately I can't vote to close again – MoxxiManagarm Sep 05 '22 at 10:18

What is the !: in typescript?

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