My goal is to create a method that accepts a key argument which can be either a string or an instance of the indexable type interface IValidationContextIndex. Here is the implementation:
/**
* Retrieves all values in the ValidationContext container.
* @returns An array of ValidationContext instances stored in the cache.
*/
public static getValidationContextValues(key: IValidationContextIndex | string ): Array<ValidationContext> {
if (key instanceof IValidationContextIndex ) [
return Object.values(<any> key);
]
else {
const vci = ValidationContainer.cache[<string>key];
return Object.values(<any> vci);
}
}
When using Typescript, the following error message occurs for the if block:
[ts] 'IValidationContextIndex' only refers to a type, but is being used as a value here.
Do you have any suggestions on how to resolve this issue?
In most cases, it's possible to add a type property to interfaces such as type: 'IValidationContextsIndex'; however, due to the nature of the interface being an indexable type interface, this approach does not work in this scenario....