I'm looking for a way to extend a TypeScript object with a specific type. Here's an example scenario:
interface BaseInterface<T> {
staticA: string;
staticB: number;
dynamicA: T;
}
BaseInterface<SomeOtherInterfaceOrType>
When used in this manner, the dynamicA type should be defined as SomeOtherInterfaceOrType.
Is there a way to achieve this functionality? How can I create another interface that is of that type?
Type aliases can be a powerful tool: By using syntax similar to variable declaration, you have the ability to create type aliases and associate your generic interface with a specific type. This process can be repeated infinitely for any type that matches T (given that T is not constrained). Generic types essentially act as factories for creating types/interfaces.
interface BaseInterface<T> {
staticA: string;
staticB: number;
dynamicA: T;
}
type ConstrainedToSymbol = BaseInterface<Symbol>;
// equivalent interface definition with fixed type:
interface ConstrainedToNumber extends BaseInterface<number> {}
type ConstrainedToString = BaseInterface<string>;
function func(cbs: ConstrainedToString):string {
return cbs.dynamicA // Always a string!
}
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