export declare enum ClassnameStatus {
    DETECTED = 0,
    IGNORED = 1,
    EMITTED = 2,
    DEFINED = 3
}
export declare class CheckCSS {
    #private;
    onClassnameDetected?: (classname: string, el: Element) => boolean;
    onUndefinedClassname(classname: string): void;
    constructor(document?: Document);
    get _testState(): Map<string, ClassnameStatus>;
    scan(): this;
    watch(): this | undefined;
}