export declare class Destroyable {
    protected _isDestroyed: boolean;
    protected _destructionMessage: string;
    constructor();
    /**
     * Is this instance are destroy?
     */
    get isDestroyed(): boolean;
    /**
     * check the instance is destroyed.
     * If an instance is destroyed by the `destroy` method, throw the destruction reason as an error message.
     */
    protected checkDestroy(): void;
    /**
     * Destroy this instance with reason.
     * @param message reason message
     */
    protected destroy(message: string): void;
}