/**
 * Cross-platform USB device discovery for CrossPad.
 *
 * Primary method: Python/pyserial (required for IDF builds anyway).
 * Fallback: platform-specific commands (Linux sysfs, macOS system_profiler, Windows PowerShell).
 *
 * Supports multiple simultaneous CrossPad devices — each identified by port path.
 */
export type CrosspadKind = "esp-native" | "stm-bridge";
/** Returns the CrossPad generation for a USB VID/PID, or null if not a CrossPad. */
export declare function classifyCrosspad(vid: number, pid: number): CrosspadKind | null;
export interface CrosspadDevice {
    port: string;
    vid: number;
    pid: number;
    serial_number: string | null;
    description: string;
    manufacturer: string | null;
    is_crosspad: boolean;
    /** Which CrossPad generation this is (null when not a CrossPad). */
    kind: CrosspadKind | null;
}
export interface DeviceListResult {
    success: boolean;
    devices: CrosspadDevice[];
    all_ports: CrosspadDevice[];
    error?: string;
}
/**
 * List all connected USB serial devices. Returns CrossPad devices separately.
 * Tries Python/pyserial first, falls back to platform-specific methods.
 */
export declare function listDevices(): DeviceListResult;
/**
 * Find a CrossPad device, optionally by port.
 * If port is specified, validates it's a CrossPad device.
 * If not specified, auto-detects (fails if 0 or >1 found).
 */
export declare function findCrosspadPort(port?: string): {
    port: string;
    device?: CrosspadDevice;
    error?: string;
};