Is it possible to achieve something like this?
interface User {
name: string;
age: number;
}
// The syntax User['*'] is just an example, not a real feature
const user: User['*'] = 'Bob'; // No error
const user: User['*'] = 32; // No error
const user: User['*'] = true; // Error
I'm aware of the "or" (|) operator, but it can get redundant if the User interface has many typed properties.
To obtain a combination of all potential values in an interface, you can utilize an indexed type query with keyof T:
interface Person {
firstName: string;
age: number;
}
const personValue1: Person[keyof Person] = 'Alice'; // No issues
const personValue2: Person[keyof Person] = 25; // No issues
const personValue3: Person[keyof Person] = false; // Error
If this is a common occurrence for you, consider creating a helper type:
type ValueOf<T> = T[keyof T]
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