/**
 * `NullValue` is a singleton enumeration to represent the null value for the
 * `Value` type union.
 *
 *  The JSON representation for `NullValue` is JSON `null`.
 */
export declare enum NullValue {
    /** NULL_VALUE - Null value. */
    NULL_VALUE = "NULL_VALUE",
    UNRECOGNIZED = "UNRECOGNIZED"
}
//# sourceMappingURL=struct.enums.d.ts.map