export declare class Helper {
    /**
     * Checks if the given object is undefined or null, and returns a default value if so.
     * @param obj The Object to check
     * @param returnValue The value to return if the object is undefined or null
     * @returns returnValue` if `obj` is undefined or null, otherwise returns `obj
     * @deprecated Use `Undefined.defaultIfUndefined` instead.
     */
    static isUndefined<T, K>(obj: T, returnValue: K): K | T;
}
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