export declare const defaultPlugins: {
    join: (color1: any, strength1: any, color2: any, strength2: any) => any;
    color: (colorValue: any, tpaParams: ITPAParams) => any;
    font: (font: any, tpaParams: ITPAParams) => any;
    opacity: (color: any, opacity: any) => any;
    withoutOpacity: (color: any) => any;
    string: (value: any) => any;
    darken: (colorVal: any, darkenValue: any) => any;
    number: (value: any) => number;
    underline: (font: any) => "" | "underline";
    unit: (value: any, unit: any) => string;
    fallback: (...args: any[]) => any;
    zeroAsTrue: (zero: any) => any;
    calculate: (operator: any, ...args: any[]) => any;
    readableFallback: (baseColor: string, suggestedColor: string, fallbackColor: string) => string;
    smartBGContrast: (foreground: any, background: any) => any;
};