Good day
Trying to deal with generics
There are 2 types
TUserInfotype TUserInfo = {
id: num,
readonly fname: string,
readonly lname: string
}
TBodytype TBody = {
success: boolean,
user?: any
}
Tell me how to pass any type to TBody (for example, TUserInfo). And user should have the same type instead of any.
Thank you in advance
I think it is better to use discriminated unions in this case:
export interface User {
id: number,
fname: string,
lname: string
}
type Response<T> =
| {
success: true;
user: T
}
| {
success: false
}
type Result = Response<User>
declare var result: Result
if (result.success) {
result.user
} else {
result.success // false
result.user // error
}
I'd willing to bet that if success if false - user property should be ubdefined.
Result type is pretty popular monad.
See Rust Result, F# Result
In typescript, you can create interfaces.
export interface TUserInfo {
id: number,
fname: string,
lname: string
}
export interface TBody {
success: boolean,
user?: TUserInfo
}
Did so
type TBody<T> = {
success: boolean;
user?: T;
}