export declare class CssCombiner {
    private static _helperElement;
    static combine(styles: Map<string, string>, globalStyles?: Map<string, string>): Map<string, string>;
    private static applyStylesToHelper;
    private static combineBrowserSupportedShorthands;
    private static getNormalizedStyleValues;
    private static getCandidateCoverage;
    private static matchesNormalizedStyleValues;
    private static readStyleValue;
    private static getSerializedSize;
    private static parseStyleDeclarationList;
    private static addStyleDeclaration;
    private static combineBorder;
    private static combineMargin;
    private static combinePadding;
    private static combineInset;
    private static combineBackground;
    private static combineFont;
    private static checkIfStyleIsCombinable;
}