No error for undefined variables when using *ngIf

[Stephan Plänitz]

Description

Not existing variables woudnt show an error. This is the case of elements which parent have a *ngIf.

In this example the variable context_ doesnt exist. But for the neasted element this woudnt show an error.

{{ context_ }}
<ng-container *ngIf="context_">
  {{ context_ }}
</ng-container>
{{ context_ }}

🌍 Your Environment

Angular Version: 16.1
Angular Language Service: 17.0.3
@angular-devkit/architect 0.1602.10
@angular-devkit/build-angular 16.2.10
@angular-devkit/core 16.2.10
@angular-devkit/schematics 16.1.8
@angular/cli 16.1.8
@schematics/angular 16.1.8
rxjs 7.8.1
typescript 5.1.6
zone.js 0.13.3

Extension Version:
17.0.3

VSCode Version:
1.85.1

Operating System:
macos 12.3.1 (21E258)

[Andrew Scott]

Thanks for reporting this issue. However, you didn't provide sufficient information for us to understand and reproduce the problem. It seems likely that your project is not using strict template type checking.

Please check out our submission guidelines to understand why we can't act on issues that are lacking important information.

If the problem still exists in your application, please open a new issue and follow the instructions in the issue template.

[Stephan Plänitz]

@atscott
thanks for the hint.
after i add "fullTemplateTypeCheck": true to my tsconfig it shows the error.

[Andrew Scott]

fullTemplateTypeCheck is deprecated and actually skips a lot of checks: https://angular.io/guide/angular-compiler-options#fulltemplatetypecheck. The option you want is "strictTemplates": true

[Stephan Plänitz]

i think i have to clean much code firstly ;-)

[Andrew Scott]

@enersis-pst There is also an extension option to force strict templates without changing your tsconfig. This does mean that you are choosing to use compiler options for the language service that differ from what's used in the application so you will see more errors. But at least you can continue compiling and running the application and fix things as you see them.

[Stephan Plänitz]

thanks thats what i need ;-)

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