next
Version:
The React Framework
9 lines (8 loc) • 389 B
TypeScript
/**
* A type that represents a deeply readonly object. This is similar to
* TypeScript's `Readonly` type, but it recursively applies the `readonly`
* modifier to all properties of an object and all elements of arrays.
*/
export type DeepReadonly<T> = T extends (infer R)[] ? ReadonlyArray<DeepReadonly<R>> : T extends object ? {
readonly [K in keyof T]: DeepReadonly<T[K]>;
} : T;