/** Promise type with strongly typed error */
export type CustomPromise<T, E> = Promise<T> & {
    __errorType: E;
};
/**
 * Creates a Promise with strongly typed error
 * @param executor - Promise executor function
 * @returns Promise with typed error
 */
export declare function makePromise<T, E>(executor: (resolve: (value: T | PromiseLike<T>) => void, reject: (reason: E) => void) => void): CustomPromise<T, E>;
/** Promise with exposed resolve/reject functions and typed error */
export type Deferred<T, E = T> = CustomPromise<T, E> & {
    resolve: (arg: T) => void;
    reject: (arg: E) => void;
};
/**
 * Creates a Deferred promise
 * @returns Promise with resolve/reject methods exposed
 */
export declare const defer: <T, E = T>() => Deferred<T, E>;
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