Function tryMergeUnionOfObjectTypeAndEmptyObject

test/fixtures/snapshot/typescript.js:62862–62901

(type, readonly)

            return isEmptyObjectType(type) || !!(type.flags & (65536 /* TypeFlags.Null */ | 32768 /* TypeFlags.Undefined */ | 528 /* TypeFlags.BooleanLike */ | 296 /* TypeFlags.NumberLike */ | 2112 /* TypeFlags.BigIntLike */ | 402653316 /* TypeFlags.StringLike */ | 1056 /* TypeFlags.EnumLike */ | 67108864 /* TypeFlags.NonPrimitive */ | 4194304 /* TypeFlags.Index */));
        }
        function tryMergeUnionOfObjectTypeAndEmptyObject(type, readonly) {
            if (!(type.flags & 1048576 /* TypeFlags.Union */)) {
                return type;
            }
            if (ts.every(type.types, isEmptyObjectTypeOrSpreadsIntoEmptyObject)) {
                return ts.find(type.types, isEmptyObjectType) || emptyObjectType;
            }
            var firstType = ts.find(type.types, function (t) { return !isEmptyObjectTypeOrSpreadsIntoEmptyObject(t); });
            if (!firstType) {
                return type;
            }
            var secondType = ts.find(type.types, function (t) { return t !== firstType && !isEmptyObjectTypeOrSpreadsIntoEmptyObject(t); });
            if (secondType) {
                return type;
            }
            return getAnonymousPartialType(firstType);
            function getAnonymousPartialType(type) {
                // gets the type as if it had been spread, but where everything in the spread is made optional
                var members = ts.createSymbolTable();
                for (var _i = 0, _a = getPropertiesOfType(type); _i < _a.length; _i++) {
                    var prop = _a[_i];
                    if (ts.getDeclarationModifierFlagsFromSymbol(prop) & (8 /* ModifierFlags.Private */ | 16 /* ModifierFlags.Protected */)) {
                        // do nothing, skip privates
                    }
                    else if (isSpreadableProperty(prop)) {
                        var isSetonlyAccessor = prop.flags & 65536 /* SymbolFlags.SetAccessor */ && !(prop.flags & 32768 /* SymbolFlags.GetAccessor */);
                        var flags = 4 /* SymbolFlags.Property */ | 16777216 /* SymbolFlags.Optional */;
                        var result = createSymbol(flags, prop.escapedName, getIsLateCheckFlag(prop) | (readonly ? 8 /* CheckFlags.Readonly */ : 0));
                        result.type = isSetonlyAccessor ? undefinedType : addOptionality(getTypeOfSymbol(prop), /*isProperty*/ true);
                        result.declarations = prop.declarations;
                        result.nameType = getSymbolLinks(prop).nameType;
                        result.syntheticOrigin = prop;
                        members.set(prop.escapedName, result);
                    }
                }
                var spread = createAnonymousType(type.symbol, members, ts.emptyArray, ts.emptyArray, getIndexInfosOfType(type));
                spread.objectFlags |= 128 /* ObjectFlags.ObjectLiteral */ | 131072 /* ObjectFlags.ContainsObjectOrArrayLiteral */;
                return spread;
            }
        }
        /**
         * Since the source of spread types are object literals, which are not binary,
         * this function should be called in a left folding style, with left = previous result of getSpreadType