/**
 * Helper class to check whether a node has particular format or not
 *
 * @hidden
 */
export declare class FormattingHelper {
    private static validBoldTags;
    private static validItalicTags;
    private static validUnderlineTags;
    private static validStrikethroughTags;
    private static validSuperscriptTags;
    private static validSubscriptTags;
    private static validInlineCodeTags;
    private static inlineTagsSet;
    /**
     * isBold method
     *
     * @param {Node} node - specifies the node value
     * @returns {boolean} - returns the boolean value
     * @hidden
     */
    static isBold(node: Node): boolean;
    /**
     * isItalic method
     *
     * @param {Node} node - specifies the node value
     * @returns {boolean} - returns the boolean value
     * @hidden
     */
    static isItalic(node: Node): boolean;
    /**
     * isUnderline method
     *
     * @param {Node} node - specifies the node value
     * @returns {boolean} - returns the boolean value
     * @hidden
     */
    static isUnderline(node: Node): boolean;
    /**
     * isStrikethrough method
     *
     * @param {Node} node - specifies the node value
     * @returns {boolean} - returns the boolean value
     * @hidden
     */
    static isStrikethrough(node: Node): boolean;
    /**
     * isSuperscript method
     *
     * @param {Node} node - specifies the node value
     * @returns {boolean} - returns the boolean value
     * @hidden
     */
    static isSuperscript(node: Node): boolean;
    /**
     * isSubscript method
     *
     * @param {Node} node - specifies the node value
     * @returns {boolean} - returns the boolean value
     * @hidden
     */
    static isSubscript(node: Node): boolean;
    /**
     * isInlineCode method
     *
     * @param {Node} node - specifies the node value
     * @returns {boolean} - returns the boolean value
     * @hidden
     */
    static isInlineCode(node: Node): boolean;
    static getFontColor(node: Node): string;
    static getBackgroundColor(node: Node): string;
    private static getStyleProperty;
}
