Function getNullableType

test/fixtures/snapshot/typescript.js:67627–67633

* Add undefined or null or both to a type if they are missing. * @param type - type to add undefined and/or null to if not present * @param flags - Either TypeFlags.Undefined or TypeFlags.Null, or both

(type, flags)

         * @param flags - Either TypeFlags.Undefined or TypeFlags.Null, or both
         */
        function getNullableType(type, flags) {
            var missing = (flags & ~type.flags) & (32768 /* TypeFlags.Undefined */ | 65536 /* TypeFlags.Null */);
            return missing === 0 ? type :
                missing === 32768 /* TypeFlags.Undefined */ ? getUnionType([type, undefinedType]) :
                    missing === 65536 /* TypeFlags.Null */ ? getUnionType([type, nullType]) :
                        getUnionType([type, undefinedType, nullType]);
        }
        function getOptionalType(type, isProperty) {
            if (isProperty === void 0) { isProperty = false; }
            ts.Debug.assert(strictNullChecks);