Update LKG.

Author: DanielRosenwasser

lib/tsc.js

@@ -67,7 +67,7 @@ var __makeTemplateObject = (this && this.__makeTemplateObject) || function (cook
 var ts;
 (function (ts) {
     ts.versionMajorMinor = "3.7";
-    ts.version = ts.versionMajorMinor + ".1-rc";
+    ts.version = ts.versionMajorMinor + ".2";
 })(ts || (ts = {}));
 (function (ts) {
     function tryGetNativeMap() {
@@ -11889,6 +11889,10 @@ var ts;
         return ts.isOptionalChainRoot(node.parent) && node.parent.expression === node;
     }
     ts.isExpressionOfOptionalChainRoot = isExpressionOfOptionalChainRoot;
+    function isNullishCoalesce(node) {
+        return node.kind === 208 && node.operatorToken.kind === 60;
+    }
+    ts.isNullishCoalesce = isNullishCoalesce;
     function isNewExpression(node) {
         return node.kind === 196;
     }
@@ -24153,11 +24157,10 @@ var ts;
             if (!expression) {
                 return flags & 32 ? antecedent : unreachableFlow;
             }
-            if (expression.kind === 105 && flags & 64 ||
-                expression.kind === 90 && flags & 32) {
-                if (!ts.isExpressionOfOptionalChainRoot(expression)) {
-                    return unreachableFlow;
-                }
+            if ((expression.kind === 105 && flags & 64 ||
+                expression.kind === 90 && flags & 32) &&
+                !ts.isExpressionOfOptionalChainRoot(expression) && !ts.isNullishCoalesce(expression.parent)) {
+                return unreachableFlow;
             }
             if (!isNarrowingExpression(expression)) {
                 return antecedent;
@@ -24996,7 +24999,12 @@ var ts;
                         switch (ts.getAssignmentDeclarationPropertyAccessKind(declName.parent)) {
                             case 1:
                             case 2:
-                                container = file;
+                                if (!ts.isExternalOrCommonJsModule(file)) {
+                                    container = undefined;
+                                }
+                                else {
+                                    container = file;
+                                }
                                 break;
                             case 4:
                                 container = declName.parent.expression;
@@ -25010,7 +25018,9 @@ var ts;
                             case 0:
                                 return ts.Debug.fail("Shouldn't have detected typedef or enum on non-assignment declaration");
                         }
-                        declareModuleMember(typeAlias, 524288, 788968);
+                        if (container) {
+                            declareModuleMember(typeAlias, 524288, 788968);
+                        }
                         container = oldContainer;
                     }
                 }
@@ -29990,7 +30000,6 @@ var ts;
                     else if (context.flags & 2048 &&
                         type.symbol.valueDeclaration &&
                         ts.isClassLike(type.symbol.valueDeclaration) &&
-                        ts.findAncestor(type.symbol.valueDeclaration, function (d) { return d === ts.getSourceFileOfNode(context.enclosingDeclaration); }) &&
                         !isValueSymbolAccessible(type.symbol, context.enclosingDeclaration)) {
                         return createAnonymousTypeNode(type);
                     }
@@ -35247,7 +35256,9 @@ var ts;
                     && ts.isCallExpression(decl.initializer)
                     && ts.isRequireCall(decl.initializer, true)
                     && valueType.symbol;
-                if (isRequireAlias) {
+                var isImportType = node.kind === 187;
+                var isDelayedMergeClass = symbol !== valueType.symbol && getMergedSymbol(symbol) === valueType.symbol;
+                if (isRequireAlias || isImportType || isDelayedMergeClass) {
                     typeType = getTypeReferenceType(node, valueType.symbol);
                 }
             }
@@ -37870,13 +37881,13 @@ var ts;
             }
             if (!ignoreReturnTypes) {
                 var targetReturnType = isResolvingReturnTypeOfSignature(target) ? anyType
-                    : target.declaration && isJSConstructor(target.declaration) ? getDeclaredTypeOfClassOrInterface(target.declaration.symbol)
+                    : target.declaration && isJSConstructor(target.declaration) ? getDeclaredTypeOfClassOrInterface(getMergedSymbol(target.declaration.symbol))
                         : getReturnTypeOfSignature(target);
                 if (targetReturnType === voidType) {
                     return result;
                 }
                 var sourceReturnType = isResolvingReturnTypeOfSignature(source) ? anyType
-                    : source.declaration && isJSConstructor(source.declaration) ? getDeclaredTypeOfClassOrInterface(source.declaration.symbol)
+                    : source.declaration && isJSConstructor(source.declaration) ? getDeclaredTypeOfClassOrInterface(getMergedSymbol(source.declaration.symbol))
                         : getReturnTypeOfSignature(source);
                 var targetTypePredicate = getTypePredicateOfSignature(target);
                 if (targetTypePredicate) {
@@ -78958,6 +78969,15 @@ var ts;
         function findSourceFile(fileName, path, isDefaultLib, ignoreNoDefaultLib, refFile, packageId) {
             if (useSourceOfProjectReferenceRedirect) {
                 var source = getSourceOfProjectReferenceRedirect(fileName);
+                if (!source &&
+                    host.realpath &&
+                    options.preserveSymlinks &&
+                    ts.isDeclarationFileName(fileName) &&
+                    ts.stringContains(fileName, ts.nodeModulesPathPart)) {
+                    var realPath = host.realpath(fileName);
+                    if (realPath !== fileName)
+                        source = getSourceOfProjectReferenceRedirect(realPath);
+                }
                 if (source) {
                     var file_1 = ts.isString(source) ?
                         findSourceFile(source, toPath(source), isDefaultLib, ignoreNoDefaultLib, refFile, packageId) :