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When the `NgIf` directive is used in a template, its context variables
can be used to capture the bound value. This is sometimes used in
complex expressions, where the resulting value is captured in a
context variable. There's two syntax forms available:
1. Binding to `NgIfContext.ngIf` using the `as` syntax:
```html
<span *ngIf="enabled && user as u">{{u.name}}</span>
```
2. Binding to `NgIfContext.$implicit` using the `let` syntax:
```html
<span *ngIf="enabled && user; let u">{{u.name}}</span>
```
Because of the semantics of `ngIf`, it is known that the captured
context variable is truthy, however the template type checker
would not consider them as such and still report errors when
`strict` is enabled.
This commit updates `NgIf`'s context guard to make the types of the
context variables truthy, avoiding the issue.
Based on https://github.com/angular/angular/pull/35125
PR Close #36627
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| .. | ||
| compliance | ||
| diagnostics | ||
| helpers | ||
| metadata | ||
| ngtsc | ||
| transformers | ||
| BUILD.bazel | ||
| extract_i18n_spec.ts | ||
| mocks.ts | ||
| ngc_spec.ts | ||
| perform_compile_spec.ts | ||
| perform_watch_spec.ts | ||
| test_support.ts | ||
| typescript_support_spec.ts | ||