/// <reference types="node" />
import { Transform, TransformCallback } from 'stream';
/**
 * A transform stream replacing one single place holder with either a string or a steam.
 */
export default class Replacer extends Transform {
    private placeholder;
    private readonly replacement;
    /**
     * The remaining to be output.
     */
    private remain;
    /**
     * Create the stream transform.
     *
     * @param placeholder - The place holder to replace with content.
     * @param replacement - The replacement to use.
     */
    constructor(placeholder: string, replacement: {
        toString(): string;
    } | NodeJS.ReadableStream);
    _transform(chunk: unknown, encoding: BufferEncoding, done: TransformCallback): void;
    _flush(done: TransformCallback): void;
    /**
     * Replace the placeholder with the given content.
     *
     * @param done - The callback to execute when replacement is done.
     */
    private replace;
    /**
     * Flush the remaining data.
     */
    private flushRemaining;
}