export type SysExMessage = Uint8Array;
export type HardwareMidiPortOptions = {
    inputPortIndex: number;
    outputPortIndex: number;
    /** MIDI channel 0..15 (0 = channel 1). */
    channel: number;
    /** When true, input is configured to NOT ignore SysEx. */
    enableSysexReception: boolean;
};
export declare class HardwareMidiPort {
    private readonly opts;
    private readonly input;
    private readonly output;
    private isOpen;
    readonly channel: number;
    constructor(opts: HardwareMidiPortOptions);
    open(): void;
    close(): void;
    sendBytes(message: Uint8Array): void;
    sendCc(cc: number, value: number, channel?: number): void;
    onMessage(handler: (deltaTime: number, message: Uint8Array) => void): () => void;
    requestSysEx(request: Uint8Array, timeoutMs: number, predicate?: (msg: SysExMessage) => boolean): Promise<SysExMessage>;
}