/**
 * A class representing a deferred promise.
 *
 * The `Deferred` class allows you to create a promise and resolve or reject it
 * at a later time. This can be useful for scenarios where you need to control
 * the timing of the promise resolution or rejection.
 * @template T - The type of the value that the promise will resolve with.
 */
export declare class Deferred<T = void> {
    #private;
    /**
     * Creates an instance of the `Deferred` class.
     *
     * The constructor initializes the internal promise and sets up the resolve
     * and reject functions.
     */
    constructor();
    /**
     * Returns the internal promise.
     * @returns The promise that will be resolved or rejected.
     */
    promise(): Promise<T>;
    /**
     * Rejects the internal promise with the given reason.
     * @param reason The reason for rejecting the promise.
     */
    reject(reason?: unknown): void;
    /**
     * Resolves the internal promise with the given value.
     * @param value The value to resolve the promise with.
     */
    resolve(value: T): void;
}