export declare class StatusBanner {
    private _deviceName;
    private _el;
    private _dot;
    private _label;
    private _everConnected;
    private _hideTimer;
    constructor(_deviceName: string);
    /** WebMIDI is unavailable in this browser — terminal error state. */
    noWebMidi(): void;
    /** Device is connected; auto-hides after a short delay. */
    connected(): void;
    /** Device disconnected — distinguishes "never found" from "lost". */
    disconnected(): void;
    /** Hide the banner immediately (runtime statusLabel(false)). */
    hide(): void;
    /** Re-show a previously hidden banner. */
    show(): void;
    private _apply;
}