/**
 * @returns whether the provided parameter is undefined.
 */
export declare function isUndefined(obj: any): obj is undefined;
export declare function isNull(obj: any): obj is null;
/**
 * @returns whether the provided parameter is undefined or null.
 */
export declare function isUndefinedOrNull(obj: any): obj is undefined | null;
/**
 * @returns whether the provided parameter is defined.
 */
export declare function isDefined<T>(arg: T | null | undefined): arg is T;
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