type FunctionLike = (...args: any[]) => any;
interface MockInstance {
    getCalledTimes: () => number;
    getCalled: () => boolean;
}
interface Mock<T extends FunctionLike> extends Function, MockInstance {
    (...args: Parameters<T>): ReturnType<T>;
}
/**
 * A super simple mock for functions.
 *
 * Use this instead of `jest.fn` in public API, because some users may not using
 * Jest environment.
 */
export declare function simpleMockFn<T extends FunctionLike>(implementation: T): Mock<T>;
export {};