/**
 * Determine if the given argument is a Generator object.
 * (A generator is the one created when calling a generator function)
 *
 * @example
 * ```ts
 * function *gen() {}
 *
 * isGenerator(gen()); // -> true
 * isGenerator({ next() {}, throw() {} return() {} [Symbol.iterator]() {} }); // -> true
 * isGenerator(() => {}); // -> false
 * ```
 *
 * @param x - Argument to test
 * @return - Whether the argument a Generator like function or not
 */
export declare function isGenerator(x: any): x is Generator;
/**
 * Determine if the given argument is a Generator Function
 *
 * @example
 * ```ts
 * function* gen() {}
 *
 * isGeneratorFunction(gen); // -> true
 * isGeneratorFunction(() => {}); // -> false
 * ```
 *
 * @param x - Argument to test
 * @return - Whether the argument a Generator or not
 */
export default function isGeneratorFunction(x: any): x is GeneratorFunction;