Description
Re-map keys in mapped types. See the PR[fn:pr] for more information.
Syntax
type MappedTypeWithNewKeys<T> = {
[K in keyof T as NewKeyType]: T[K]
// ^^^^^^^^^^^^^
// This is the new syntax!
}Leverage template literal types to create property names based off old ones
type Getters<T> = {
[K in keyof T as `get${Capitalize<string & K>}`]: () => T[K]
};
interface Person {
name: string;
age: number;
location: string;
}
type LazyPerson = Getters<Person>;Filter out keys
// Remove the 'kind' property
type RemoveKindField<T> = {
[K in keyof T as Exclude<K, "kind">]: T[K]
};
interface Circle {
kind: "circle";
radius: number;
}
type KindlessCircle = RemoveKindField<Circle>;
// same as
// type KindlessCircle = {
// radius: number;
// };