When aot is enabled, ngClass and ngIf condition may not compile successfully

I am encountering an issue with a div using ngClass and ngIf conditions:

<div [ngClass]="{ 'active': nbActive === 1 }" >
    <!-- some stuff -->
</div>

There is also a similar div using a ngIf condition:

<div *ngIf="nbActive === 1">
    <!-- some stuff -->
</div>

The declaration for NbActive looks like this:

export class WhyChooseUsComponent implements OnInit {
   nbActive: 0;
   constructor() { }
   // some stuff
}

When I set the production configuration parameters as follows:

"aot": true,
"buildOptimizer": true,

An error occurs stating:

This condition will always return 'false' since the types '0' and '1' have no overlap.

No errors occur when setting aot and buildOptimizer to false. Everything functions as expected in that scenario.
What is causing this issue and how can it be resolved?

Answer №1

You have provided the following code snippet:

   nbActive: 0;

This indicates that the only valid value for nbActive is 0.

Perhaps you intended to use this instead:

   nbActive: number = 0;

Answer №2

Here is a suggestion to approach it:


<div [ngClass]="isActive === 1 ? 'active': '' " >
    <!-- placeholder for content -->
</div>

<div *ngIf="isActive">
    <!-- placeholder for content -->
</div>

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