Function createUnionOrIntersectionProperty

test/fixtures/snapshot/typescript.js:59152–59314

(containingType, name, skipObjectFunctionPropertyAugment)

            return getReducedType(getApparentType(getReducedType(type)));
        }
        function createUnionOrIntersectionProperty(containingType, name, skipObjectFunctionPropertyAugment) {
            var _a, _b;
            var singleProp;
            var propSet;
            var indexTypes;
            var isUnion = containingType.flags & 1048576 /* TypeFlags.Union */;
            // Flags we want to propagate to the result if they exist in all source symbols
            var optionalFlag = isUnion ? 0 /* SymbolFlags.None */ : 16777216 /* SymbolFlags.Optional */;
            var syntheticFlag = 4 /* CheckFlags.SyntheticMethod */;
            var checkFlags = isUnion ? 0 : 8 /* CheckFlags.Readonly */;
            var mergedInstantiations = false;
            for (var _i = 0, _c = containingType.types; _i < _c.length; _i++) {
                var current = _c[_i];
                var type = getApparentType(current);
                if (!(isErrorType(type) || type.flags & 131072 /* TypeFlags.Never */)) {
                    var prop = getPropertyOfType(type, name, skipObjectFunctionPropertyAugment);
                    var modifiers = prop ? ts.getDeclarationModifierFlagsFromSymbol(prop) : 0;
                    if (prop) {
                        if (isUnion) {
                            optionalFlag |= (prop.flags & 16777216 /* SymbolFlags.Optional */);
                        }
                        else {
                            optionalFlag &= prop.flags;
                        }
                        if (!singleProp) {
                            singleProp = prop;
                        }
                        else if (prop !== singleProp) {
                            var isInstantiation = (getTargetSymbol(prop) || prop) === (getTargetSymbol(singleProp) || singleProp);
                            // If the symbols are instances of one another with identical types - consider the symbols
                            // equivalent and just use the first one, which thus allows us to avoid eliding private
                            // members when intersecting a (this-)instantiations of a class with it's raw base or another instance
                            if (isInstantiation && compareProperties(singleProp, prop, function (a, b) { return a === b ? -1 /* Ternary.True */ : 0 /* Ternary.False */; }) === -1 /* Ternary.True */) {
                                // If we merged instantiations of a generic type, we replicate the symbol parent resetting behavior we used
                                // to do when we recorded multiple distinct symbols so that we still get, eg, `Array<T>.length` printed
                                // back and not `Array<string>.length` when we're looking at a `.length` access on a `string[] | number[]`
                                mergedInstantiations = !!singleProp.parent && !!ts.length(getLocalTypeParametersOfClassOrInterfaceOrTypeAlias(singleProp.parent));
                            }
                            else {
                                if (!propSet) {
                                    propSet = new ts.Map();
                                    propSet.set(getSymbolId(singleProp), singleProp);
                                }
                                var id = getSymbolId(prop);
                                if (!propSet.has(id)) {
                                    propSet.set(id, prop);
                                }
                            }
                        }
                        if (isUnion && isReadonlySymbol(prop)) {
                            checkFlags |= 8 /* CheckFlags.Readonly */;
                        }
                        else if (!isUnion && !isReadonlySymbol(prop)) {
                            checkFlags &= ~8 /* CheckFlags.Readonly */;
                        }
                        checkFlags |= (!(modifiers & 24 /* ModifierFlags.NonPublicAccessibilityModifier */) ? 256 /* CheckFlags.ContainsPublic */ : 0) |
                            (modifiers & 16 /* ModifierFlags.Protected */ ? 512 /* CheckFlags.ContainsProtected */ : 0) |
                            (modifiers & 8 /* ModifierFlags.Private */ ? 1024 /* CheckFlags.ContainsPrivate */ : 0) |