/**
 * @license
 * Copyright 2023 Tyler Technologies, Inc. 
 * License: Apache-2.0
 */
export declare const BACKDROP_CONSTANTS: {
    elementName: "forge-backdrop";
    selectors: {
        CONTAINER: string;
    };
    numbers: {
        OPACITY: number;
        DELAY: number;
        TRANSITION_DURATION: number;
    };
    attributes: {
        DELAY: string;
        MAX_OPACITY: string;
        APPEARANCE: string;
        FIXED: string;
    };
    events: {
        BACKDROP_CLICK: string;
    };
};
export declare type BackdropAppearance = 'light' | 'dark' | undefined;
