/**
 * Stream Module - Common Utilities
 *
 * Platform-neutral utility functions shared by Node.js and Browser implementations:
 * - Stream state inspection (isDestroyed, isErrored)
 * - Callback-to-promise conversion (promisify)
 * - High water mark management (getDefaultHighWaterMark, setDefaultHighWaterMark)
 */
/**
 * Check if a stream has been destroyed
 */
export declare function isDestroyed(stream: {
    destroyed?: boolean;
} | null | undefined): boolean;
/**
 * Check if a stream has an error
 */
export declare function isErrored(stream: {
    errored?: unknown;
} | null | undefined): boolean;
/**
 * Convert a callback-based operation to a promise
 */
export declare function promisify<T>(fn: (callback: (error?: Error | null, result?: T) => void) => void): Promise<T>;
/**
 * Get the default high water mark for streams
 */
export declare function getDefaultHighWaterMark(objectMode: boolean): number;
/**
 * Set the default high water mark for streams
 */
export declare function setDefaultHighWaterMark(objectMode: boolean, value: number): void;