/**
 * Tests if the first argument is truthy, and throws the passed message if it is not.
 *
 * @param   {any}    ok      Value to test for truthiness
 * @param   {string} message Message to be thrown on failure. `%s` placeholders are replaced
 * in sequence with the arguments provided after the message.
 * @param   {...any} substitutions Values to inject into the message on failure.
 *
 * @throws Error
 * @category Errors
 */
export default function assert(ok: any, message: string, ...substitutions: any[]): void;
export function fail(...args: any[]): void;
export function assertIsArray(ok: any, ...args: any[]): void;
export function assertIsObject(ok: any, ...args: any[]): void;
export function assertIsPlainObject(ok: any, ...args: any[]): void;
export function assertIsString(ok: any, ...args: any[]): void;
export function assertIsNumber(ok: any, ...args: any[]): void;