export default class ComponentManager {
    private static readonly instances;
    element: HTMLDivElement;
    private observer;
    constructor();
    static getInstance<T extends ComponentManager>(this: new () => T): T;
    onMount(callback: () => Promise<void>): void;
    onUnmount(callback: () => Promise<void>): void;
    getElement(): HTMLDivElement;
    destroy(): void;
}
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