import type { ToolkitOptions, ToolkitResult } from "./lib/types.js";
export interface RetrofitExtensionOptions extends ToolkitOptions {
    /** AbortSignal for cancellation */
    signal?: AbortSignal;
    /** Progress callback for streaming status updates */
    onUpdate?: (msg: string) => void;
}
/**
 * Retrofit an existing Pi extension to match current template standards.
 *
 * Uses safe update logic: if the target already has a toolkit manifest,
 * only applies patches that haven't been user-modified.
 */
export declare function retrofitExtension(options: RetrofitExtensionOptions): Promise<ToolkitResult>;