import type { NonUndefined } from '@/type/utils';

/**
 * FunctionKeys
 * @desc Get union type of keys that are functions in object type `T`
 * @example
 *  type MixedProps = {name: string; setName: (name: string) => void; someKeys?: string; someFn?: (...args: any) => any;};
 *
 *   // Expect: "setName | someFn"
 *   type Keys = FunctionKeys<MixedProps>;
 */
export type FunctionKeys<T extends object> = {
  [K in keyof T]-?: NonUndefined<T[K]> extends Function ? K : never;
}[keyof T];

/**
 * NonFunctionKeys
 * @desc Get union type of keys that are non-functions in object type `T`
 * @example
 *   type MixedProps = {name: string; setName: (name: string) => void; someKeys?: string; someFn?: (...args: any) => any;};
 *
 *   // Expect: "name | someKey"
 *   type Keys = NonFunctionKeys<MixedProps>;
 */
export type NonFunctionKeys<T extends object> = {
  [K in keyof T]-?: NonUndefined<T[K]> extends Function ? never : K;
}[keyof T];

export { DeepReadonly } from './readonly';
export { Diff } from './diff';
export { PickByType } from './pick-by-type';
export { OmitByType } from './omit-by-type';
export { ValuesType } from './value-types';