/**
 * Accumulates streamed markdown text and renders it to the terminal
 * with ANSI formatting (bold, italic, code blocks, etc.).
 *
 * Strategy: accumulate full text, re-render on each write, output only
 * the newly rendered portion. Completed blocks (separated by double
 * newlines) are "committed" so re-rendering only processes the tail.
 * @docLink packages/runner/dev-guide#agent-chat-single-shot
 */
export declare class MarkdownStreamer {
    private buffer;
    private committedSource;
    private committedRender;
    private output;
    constructor(output?: NodeJS.WriteStream);
    write(chunk: string): void;
    /** Render any remaining content and reset state. */
    end(): void;
    private flush;
    private render;
}
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