/**
 * 从 interface 排除某些选项
 */
export declare type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
/**
 * 将 interface 所有值转为可选
 */
export declare type Options<T> = {
    [P in keyof T]+?: T[P];
};
/**
 * 将 interface 所有值转为必填
 */
export declare type Required<T> = {
    [P in keyof T]-?: T[P];
};
/**
 * 获取对象中的值作为类型
 *
 * ```ts
 * type NewType = ValueOf<typeof {A: 0, B: 1}>
 * ```
 */
export declare type ValueOf<T> = T[keyof T];
/**
 * 过滤 undefined, null, '', NaN
 */
export declare function isTruthy<T>(value: unknown): value is T;