/**
 * Copyright 2015 Trim-marks Inc.
 * Copyright 2019 Vivliostyle Foundation
 *
 * Vivliostyle.js is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Vivliostyle.js is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Vivliostyle.js.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @fileoverview Constants
 */
/**
 * Debug flag.
 */
export declare let isDebug: boolean;
export declare function setDebug(value: boolean): void;
/**
 * Page progression direction.
 * @enum {string}
 */
export declare enum PageProgression {
    LTR = "ltr",
    RTL = "rtl"
}
/**
 * Return PageProgression corresponding to the specified string
 */
export declare function pageProgressionOf(str: string): PageProgression;
/**
 * Page side (left/right).
 * @enum {string}
 */
export declare enum PageSide {
    LEFT = "left",
    RIGHT = "right"
}
/**
 * Viewer ready state.
 * @enum {string}
 */
export declare enum ReadyState {
    LOADING = "loading",
    INTERACTIVE = "interactive",
    COMPLETE = "complete"
}
/**
 * Pubilc members of the bundled library.
 */
export declare const constants: {
    PageProgression: typeof PageProgression;
    PageSide: typeof PageSide;
    ReadyState: typeof ReadyState;
};