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Contents
import type {IsEqual} from './is-equal';
/**
Extract all readonly keys from the given type.
This is useful when you want to create a new type that contains readonly keys only.
@example
```
import type {ReadonlyKeysOf} from 'type-fest';
interface User {
name: string;
surname: string;
readonly id: number;
}
type UpdateResponse<Entity extends object> = Pick<Entity, ReadonlyKeysOf<Entity>>;
const update1: UpdateResponse<User> = {
id: 123,
};
```
@category Utilities
*/
export type ReadonlyKeysOf<T> = NonNullable<{
[P in keyof T]: IsEqual<{[Q in P]: T[P]}, {readonly [Q in P]: T[P]}> extends true ? P : never
}[keyof T]>;
Version data entries
28 entries across 28 versions & 2 rubygems