interface KeyCode {
    key?: string;
    ctrlKey: boolean;
    metaKey: boolean;
    shiftKey: boolean | null;
}
declare type Callback = (e: KeyboardEvent) => void;
interface Key extends KeyCode {
    id: number;
    callback: Callback;
}
export default class Keys {
    handlers: {
        [key: string]: Key[];
    };
    nextIndex: number;
    constructor();
    register(key: string, callback: Callback): number;
    unregister(key: string, id: number): boolean;
    trigger(e: KeyboardEvent): void;
    listen(onKeyDown: () => void, onKeyUp: () => void): void;
}
export {};