/**
 * Event renderers — pure functions that convert HarnessEvents to display
 * strings. Renderers do NOT touch I/O; the caller decides where to write.
 *
 * Mirrors `_harness/_renderer.py`.
 */
import type { HarnessEvent } from "./events.js";
export interface RendererOptions {
    showTiming?: boolean;
    showArgs?: boolean;
    verbose?: boolean;
}
export interface Renderer {
    render(event: HarnessEvent): string | null;
}
/** Plain-text renderer — single-line per event. */
export declare class PlainRenderer implements Renderer {
    readonly showTiming: boolean;
    readonly showArgs: boolean;
    readonly verbose: boolean;
    constructor(opts?: RendererOptions);
    render(event: HarnessEvent): string | null;
}
/** Rich renderer — same as plain but with ANSI colors. */
export declare class RichRenderer extends PlainRenderer {
    render(event: HarnessEvent): string | null;
}
/** JSON renderer — one JSON object per event. */
export declare class JsonRenderer implements Renderer {
    render(event: HarnessEvent): string;
}
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