export declare function typeOf(v: unknown): string;
export declare function isSymbol<T extends Symbol = Symbol>(v: unknown): v is T;
export declare function isObject<T extends object = AnyObj>(v: unknown): v is T;
export declare function isString(v: unknown): v is string;
export declare function isNumber(v: unknown): v is number;
export declare function isUndefined(v: unknown): v is undefined;
export declare function isArray<T = unknown>(v: unknown): v is T[];
export declare function isBoolean(v: unknown): v is boolean;
export type AnyFn = (...args: any[]) => any;
export type AnyObj = Record<string | symbol | number, any>;
export declare function isFunction<T extends AnyFn = AnyFn>(v: unknown): v is T;
export declare function isPromise<T = void>(obj: unknown): obj is Promise<T>;