/**
 * A Deferred object represents a Promise that can be resolved or rejected
 * from outside the Promise constructor.
 */
export interface Deferred<T> {
    /** The Promise object being controlled */
    promise: Promise<T>;
    /** Function to resolve the Promise with a value or another Promise */
    resolve: (value: T | PromiseLike<T>) => void;
    /** Function to reject the Promise with an error */
    reject: (reason?: Error | unknown) => void;
    /** Check if the Promise has been resolved or rejected */
    isPending: () => boolean;
}
/**
 * Creates a Deferred object containing a Promise and methods to control it.
 *
 * @returns A Deferred object with promise, resolve, reject, and isPending methods
 */
export declare function createDeferred<T>(): Deferred<T>;