Everywhere I look, I seem to be writing the following:
product: Product & { id: string; };
Is there a way for me to simplify this to:
product: WithId<Product>;
I attempted to create an interface like the one below, but encountered issues with extending from generics:
export interface WithId<T> extends T {
id: string;
}
You have the option to simplify the concept by using abstraction of & {id: string}
export type WithId<T> = T & { id: string }
type Example = WithId<{ a: number }> // {a: number, id: string}
const example: Example = {a: 1, id: 'id'}
PS. { [K in keyof T]: T[keyof T] } is essentially the same as T itself, making it redundant.
One way to ensure a specific type in TypeScript is by using a type intersection
export type WithId<T> = { [K in keyof T]: T[keyof T] } & { id: string }
interface product { myNew: string }
let et: WithId<product> = { myNew: "s", id: "s" } // This is valid
let et: WithId<product> = { test: "s", id: "s" } // This will result in an error
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