/**
 * ESP-IDF flash operations: UART flash and OTA-over-CDC.
 *
 * Multi-device aware: when multiple CrossPads are connected,
 * the user must specify a port. Auto-detects when only one is present.
 *
 * - idf_flash: runs `idf.py -p <PORT> flash` (full UART flash, requires bootloader mode)
 * - idf_ota: runs `python tools/ota_flash.py` (OTA over CDC, no bootloader needed)
 */
import { OnLine } from "../utils/exec.js";
export interface FlashResult {
    success: boolean;
    method: "uart" | "ota";
    port: string;
    duration_seconds: number;
    output_tail: string[];
    error?: string;
}
export declare function crosspadIdfFlash(port: string | undefined, buildDir: string, onLine?: OnLine, signal?: AbortSignal): Promise<FlashResult>;