export declare class KeyboardUtil {
    static ifTab(event: KeyboardEvent): boolean;
    static ifDelete(event: KeyboardEvent): boolean;
    static ifBackspace(event: KeyboardEvent): boolean;
    static ifRightArrow(event: KeyboardEvent): boolean;
    static ifLeftArrow(event: KeyboardEvent): boolean;
    static ifSpacebar(event: KeyboardEvent): boolean;
    static ifKey(event: KeyboardEvent, keys: string): boolean;
}