/// <reference types="node" />
/// <reference types="vinyl" />
import { Transform } from "stream";
import { File } from "gulp-util";
import { TransformFunction, NodeCallback } from "./common";
/**
 * A stream of File objects returned by the plugin.
 */
export declare class GulpTransformStream extends Transform {
    private readonly transform;
    constructor(transform: TransformFunction);
    _transform(file: File, _encoding: string, next: NodeCallback<File>): void;
    private transformBufferFile(file, next);
    private transformStreamFile(file, next);
}