/**
 * A bidirectional byte channel to a printer.
 *
 * Implemented by `@thermal-label/transport` for each transport type
 * (USB, TCP, WebUSB, Web Bluetooth). Drivers program against this
 * interface and never touch platform APIs directly.
 */
export interface Transport {
    /** Send bytes to the printer. */
    write(data: Uint8Array): Promise<void>;
    /**
     * Read bytes from the printer.
     *
     * Buffers until `length` bytes are available or the timeout fires.
     *
     * BLE implementations: there is no "read N bytes" primitive in BLE.
     * Implementations must buffer incoming GATT notifications internally
     * and satisfy `read()` calls from that buffer. Document this in your
     * transport class — every BLE implementation must handle buffering
     * consistently so drivers get the same pull-based API on every
     * transport.
     *
     * @throws TransportTimeoutError on timeout.
     * @throws TransportClosedError if the transport is closed mid-read.
     */
    read(length: number, timeout?: number): Promise<Uint8Array>;
    /**
     * Close the connection.
     *
     * Always safe to call multiple times. Always `await` the result.
     */
    close(): Promise<void>;
    /** Whether the transport is currently connected. */
    readonly connected: boolean;
}
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