import { If, Not } from "../boolean";
import { Extends } from "../type";
/**
 * gets the required keys of `T`.
 * does not capture index signatures.
 *
 * @since 0.0.2
 *
 * @example
 * type e0 = RequiredKeys<{}> // never
 * type e1 = RequiredKeys<{ a?: 0 }> // never
 * type e2 = RequiredKeys<{ a?: 0, b: 1 | undefined, c: 2 }> // "b" | "c"
 */
export type RequiredKeys<T> = {
    [K in keyof T]-?: If<Not<Extends<{}, Pick<T, K>>>, K>;
}[keyof T];
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