import { Transform, type TransformOptions } from 'node:stream';
/**
 * Transform function signature for stream transformation.
 */
export type TransformFn<TIn, TOut> = (chunk: TIn, encoding: BufferEncoding) => TOut | Promise<TOut> | null;
/**
 * Create a Transform stream with a simple function.
 * Defaults to object mode.
 *
 * @param transformFn - Function to transform each chunk
 * @param options - Transform stream options (excluding transform function)
 * @returns Transform stream
 */
export declare function createTransformFast<TIn = unknown, TOut = TIn>(transformFn: TransformFn<TIn, TOut>, options?: Omit<TransformOptions, 'transform'>): Transform;
/**
 * Create a filter Transform stream.
 * Chunks that fail the predicate are dropped.
 *
 * @param predicate - Function that returns true to keep chunk
 * @returns Transform stream that filters chunks
 */
export declare function createFilterStreamFast<T>(predicate: (chunk: T) => boolean | Promise<boolean>): Transform;
/**
 * Create a map Transform stream.
 *
 * @param mapper - Function to map each chunk
 * @returns Transform stream that maps chunks
 */
export declare function createMapStreamFast<TIn, TOut>(mapper: (chunk: TIn) => TOut | Promise<TOut>): Transform;
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