export declare const mutable: <T extends readonly any[] | Record<string, unknown>>(val: T) => Mutable<typeof val>;
export type Mutable<T> = {
    -readonly [P in keyof T]: T[P];
};
export type HTMLElementCustomized<T> = HTMLElement & T;
/**
 * @deprecated stop to use null
 * @see {@link https://github.com/sindresorhus/meta/discussions/7}
 */
export type Nullable<T> = T | null;
export type Arrayable<T> = T | T[];
export type Awaitable<T> = Promise<T> | T;
type Primitive = null | undefined | string | number | boolean | symbol | bigint;
type BrowserNativeObject = Date | FileList | File | Blob | RegExp;
/**
 * Check whether it is tuple
 *
 * 检查是否为元组
 *
 * @example
 * IsTuple<[1, 2, 3]> => true
 * IsTuple<Array[number]> => false
 */
type IsTuple<T extends ReadonlyArray<any>> = number extends T['length'] ? false : true;
/**
 * Array method key
 *
 * 数组方法键
 */
type ArrayMethodKey = keyof any[];
/**
 * Tuple index key
 *
 * 元组下标键
 *
 * @example
 * TupleKey<[1, 2, 3]> => '0' | '1' | '2'
 */
type TupleKey<T extends ReadonlyArray<any>> = Exclude<keyof T, ArrayMethodKey>;
/**
 * Array index key
 *
 * 数组下标键
 */
type ArrayKey = number;
/**
 * Helper type for recursively constructing paths through a type
 *
 * 用于通过一个类型递归构建路径的辅助类型
 */
type PathImpl<K extends string | number, V> = V extends Primitive | BrowserNativeObject ? `${K}` : `${K}` | `${K}.${Path<V>}`;
/**
 * Type which collects all paths through a type
 *
 * 通过一个类型收集所有路径的类型
 *
 * @see {@link FieldPath}
 */
type Path<T> = T extends ReadonlyArray<infer V> ? IsTuple<T> extends true ? {
    [K in TupleKey<T>]-?: PathImpl<Exclude<K, symbol>, T[K]>;
}[TupleKey<T>] : PathImpl<ArrayKey, V> : {
    [K in keyof T]-?: PathImpl<Exclude<K, symbol>, T[K]>;
}[keyof T];
/**
 * Type which collects all paths through a type
 *
 * 通过一个类型收集所有路径的类型
 *
 * @example
 * FieldPath<{ 1: number; a: number; b: string; c: { d: number; e: string }; f: [{ value: string }]; g: { value: string }[]; h: Date; i: FileList; j: File; k: Blob; l: RegExp }> => '1' | 'a' | 'b' | 'c' | 'f' | 'g' | 'c.d' | 'c.e' | 'f.0' | 'f.0.value' | 'g.number' | 'g.number.value' | 'h' | 'i' | 'j' | 'k' | 'l'
 */
export type FieldPath<T> = T extends object ? Path<T> : never;
export {};