My code includes a method as shown below:
abstract canDeactivate() : boolean | Promise<boolean>;
I am seeking advice on how to handle both the promise and boolean implementations of this method in the caller's code.
My code includes a method as shown below:
abstract canDeactivate() : boolean | Promise<boolean>;
I am seeking advice on how to handle both the promise and boolean implementations of this method in the caller's code.
To appropriately handle the two scenarios, you must implement a type guard:
abstract class Target {
abstract canDeactivate(): boolean | Promise<boolean>;
}
declare let myTarget: Target;
const result = myTarget.canDeactivate();
if (typeof result === 'boolean') { // implementing a type guard
result // this is a boolean value
} else {
result.then(value => value) // result is of type Promise<bool>
}
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