/**
 * Creates a simulated promise to mock asynchronous operations.
 * @template T - The type of the value the promise will resolve with.
 * @template E - The type of the error the promise will reject with.
 * @param {number} [duration=3000] - Delay in milliseconds.
 * @param {boolean} [success=true] - Whether to resolve or reject.
 * @param {T} [returnValue] - Value to resolve with.
 * @param {E} [errorValue='Dummy Reject'] - Value to reject with.
 */
export declare function dummyPromise(duration?: number, success?: boolean): Promise<void>;
export declare function dummyPromise<T>(duration: number, success: true, returnValue: T): Promise<T>;
export declare function dummyPromise<T, E>(duration: number, success: false, returnValue: T, errorValue: E): Promise<never>;
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