/**
 * Something with "ctrlKey" and "shiftKey" properties.
 *
 * for example, `Event` objects.
 */
export interface WithModifierKeys {
    ctrlKey: boolean;
    shiftKey: boolean;
    metaKey: boolean;
}
export declare type MultipleSelectType = "none" | "ctrl" | "shift" | WithModifierKeys | boolean | undefined | null;
export declare function normalizeMultipleSelectType(value: MultipleSelectType): "none" | "ctrl" | "shift";