While Kotlin supports this, I haven't been able to find a way to achieve the same in Jest. My problem arises from having intricate interfaces and arrays of these interfaces where specifying all attribute values is not ideal. Here's an example of what I'm aiming for:
interface User {
name: string
lastname: string
age: number
phone: string
password: string
friend: User[] | undefined
}
const user: User = mock()
user.age = 35
incrementAge(user)
expect(user.age).toBe(36)
JavaScript doesn't natively support interfaces like TypeScript does, as they are only used for type checking during compilation in TypeScript. Because of this limitation, generating a correct mock based on an interface in JavaScript runtime is not possible. However, it can be achieved with classes.
If you need to create a mock without instantiating an object, you can cast an empty object to the desired type. Keep in mind that the cast object won't have any default properties, and accessing them will return undefined.
interface User {
name: string
lastname: string
age: number
phone: string
password: string
friend: User[] | undefined
}
const user = {} as User;
user.age = 35 // this works
user.name = undefined; // this fails due to wrong type
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