import { MMLColor } from "../color";
import { TagAdapterThemeColors } from "./TagAdapterThemeColors";
export declare class TagDebugAttribute {
    key: string;
    value: string | null;
    private theme;
    private isObserved;
    element: HTMLElement;
    private readonly valueSpan;
    private appliedValue;
    private readonly appliedValueSpan;
    constructor(key: string, value: string | null, theme: TagAdapterThemeColors, isObserved: boolean);
    setValue(value: string | null): void;
    setAppliedValue(value: number | string | boolean | MMLColor | null): void;
    hasAppliedValue(): boolean;
    hasValue(): boolean;
}
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