Let's imagine a scenario where
interface Action<T> {
assignAction(key: keyof T, value: any): void;
}
The type T is defined as
{
users: User[];
accounts: Account[];
}
Now, when using the assignAction method, if we attempt to pass in accounts for the key of users, it will result in an error due to mismatched types:
assignAction('users', accounts)
Determining how to validate the value parameter becomes challenging as its type depends on the chosen key.
To clarify the relationship, you can enhance the assignAction function by adding a generic.
interface Action<T> {
assignAction<K extends keyof T>(key: K, value: T[K]): void;
}
By specifying a generic type for your Action instance, it will be able to establish the link between key and value when invoking assignAction.
interface TypeA {
objectIdentifierA: string
}
interface TypeB {
objectIdentifierB: string
}
interface TypeC {
objectIdentifierC: string
}
enum Category1 {
OptionA = "OptionA",
OptionsBC = "OptionsBC"
}
type NamespaceKeyDirectory =
& Record<Category1.OptionA, TypeA>
& Record<Category1.OptionsBC, TypeB | TypeC>;
type NamespaceKeys<T extends Category1.OptionA | Category1.OptionsBC> = NamespaceKeyDirectory[T];
function evaluate<NS extends Category1, Key extends NamespaceKeys<NS>>(section: NS, key: Key) {
console.log("Invoked");
}
const itemA = {
objectIdentifierA: "test"
} as TypeA;
const itemB = {
objectIdentifierB: "test"
} as TypeB;
const itemC = {
objectIdentifierC: "test"
} as TypeC;
evaluate(Category1.OptionA, itemB) // not permissible
evaluate(Category1.OptionA, itemA)
evaluate(Category1.OptionsBC, itemA) // not permissible
evaluate(Category1.OptionsBC, itemB)
evaluate(Category1.OptionsBC, itemC)
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