export declare const defaultTheme: {
    background: {
        value: string;
    };
    userBubble: {
        backgroundValue: string;
        borderColor: string;
        borderWidth: string;
        fontColor: string;
    };
    botBubble: {
        backgroundValue: string;
        borderColor: string;
        borderWidth: string;
        fontColor: string;
    };
    font: {
        family: string;
        size: string;
        weight: string;
        color: string;
        lineHeight: string;
        letterSpacing: string;
    };
};
declare function initSessionTheme(themeStr: string): void;
declare function initDefaultTheme(): void;
export { initSessionTheme, initDefaultTheme };