feat(compiler): Support "in" operator in Angular templates #38560
Description
🚀 feature request
Description
I'd like to have your opinions about supporting "in" operator in html templates. Let's say I have an object of a union type A | B. I'd like to use the 'in' operator to differentiate type.
Something like:
export interface A {
a: number
}
export interface B {
b: string
}
export type MyUnionType = A | B;
item: MyUnionType = {
a: 1
}
<div *ngIf="'a' in item">
I'm expecting item is no longer of type A | B, but only A
{{item.a}}
</div>
Here is a stackblitz