export declare class DomChangesObserver {
    private readonly DEBOUNCE_DELAY;
    private static instance;
    private observer;
    private debounceTimer;
    private lastContentHash;
    private constructor();
    static getInstance(): DomChangesObserver;
    startObserving(onDomChange: () => void): void;
    private isInputElement;
    private isContentElement;
    private getContentHash;
    private handleContentChange;
    private debounceCallback;
    stopObserving(): void;
}