/**
 * Returns true if the given value is a function.
 */
export declare function isFunc(val: any): boolean;
/**
 * Returns true if the given value is a function.
 */
export declare function isPromise(val: any): boolean;
/**
 * Capitalize the first letter of the given string and return it.
 */
export declare function capitalize(str: string): string;
/**
 * Generate and return a random value between the 2 numbers.
 */
export declare function randomRange(min: number, max: number): number;
/**
 * Wraps the given handler function with a memoization/cache layer that enables a function
 * to only be bound once for the given key.
 */
export declare function memoize<T extends (...args: any[]) => any>(func: T): (key: string, ...args: Parameters<T>) => () => void;
export declare function equal(a: unknown, b: unknown): boolean;