diff --git a/lib/lib.es5.d.ts b/lib/lib.es5.d.ts
index 59937241850..9b359f8bca7 100644
--- a/lib/lib.es5.d.ts
+++ b/lib/lib.es5.d.ts
@@ -1966,7 +1966,7 @@ interface Int8Array {
 interface Int8ArrayConstructor {
     readonly prototype: Int8Array;
     new(length: number): Int8Array;
-    new(array: ArrayLike<number>): Int8Array;
+    new(array: ArrayLike<number> | ArrayBufferLike): Int8Array;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Int8Array;
 
     /**
@@ -2249,7 +2249,7 @@ interface Uint8Array {
 interface Uint8ArrayConstructor {
     readonly prototype: Uint8Array;
     new(length: number): Uint8Array;
-    new(array: ArrayLike<number>): Uint8Array;
+    new(array: ArrayLike<number> | ArrayBufferLike): Uint8Array;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Uint8Array;
 
     /**
@@ -2531,7 +2531,7 @@ interface Uint8ClampedArray {
 interface Uint8ClampedArrayConstructor {
     readonly prototype: Uint8ClampedArray;
     new(length: number): Uint8ClampedArray;
-    new(array: ArrayLike<number>): Uint8ClampedArray;
+    new(array: ArrayLike<number> | ArrayBufferLike): Uint8ClampedArray;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Uint8ClampedArray;
 
     /**
@@ -2811,7 +2811,7 @@ interface Int16Array {
 interface Int16ArrayConstructor {
     readonly prototype: Int16Array;
     new(length: number): Int16Array;
-    new(array: ArrayLike<number>): Int16Array;
+    new(array: ArrayLike<number> | ArrayBufferLike): Int16Array;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Int16Array;
 
     /**
@@ -3094,7 +3094,7 @@ interface Uint16Array {
 interface Uint16ArrayConstructor {
     readonly prototype: Uint16Array;
     new(length: number): Uint16Array;
-    new(array: ArrayLike<number>): Uint16Array;
+    new(array: ArrayLike<number> | ArrayBufferLike): Uint16Array;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Uint16Array;
 
     /**
@@ -3376,7 +3376,7 @@ interface Int32Array {
 interface Int32ArrayConstructor {
     readonly prototype: Int32Array;
     new(length: number): Int32Array;
-    new(array: ArrayLike<number>): Int32Array;
+    new(array: ArrayLike<number> | ArrayBufferLike): Int32Array;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Int32Array;
 
     /**
@@ -3657,7 +3657,7 @@ interface Uint32Array {
 interface Uint32ArrayConstructor {
     readonly prototype: Uint32Array;
     new(length: number): Uint32Array;
-    new(array: ArrayLike<number>): Uint32Array;
+    new(array: ArrayLike<number> | ArrayBufferLike): Uint32Array;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Uint32Array;
 
     /**
@@ -3939,7 +3939,7 @@ interface Float32Array {
 interface Float32ArrayConstructor {
     readonly prototype: Float32Array;
     new(length: number): Float32Array;
-    new(array: ArrayLike<number>): Float32Array;
+    new(array: ArrayLike<number> | ArrayBufferLike): Float32Array;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Float32Array;
 
     /**
@@ -4213,7 +4213,7 @@ interface Float64Array {
 interface Float64ArrayConstructor {
     readonly prototype: Float64Array;
     new(length: number): Float64Array;
-    new(array: ArrayLike<number>): Float64Array;
+    new(array: ArrayLike<number> | ArrayBufferLike): Float64Array;
     new(buffer: ArrayBufferLike, byteOffset?: number, length?: number): Float64Array;
 
     /**
diff --git a/lib/tsc.js b/lib/tsc.js
index ea0b564b799..ed478d835c9 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -38474,7 +38474,6 @@ var ts;
             }
             function getSpecifierForModuleSymbol(symbol, context) {
                 var _a;
-                var _b;
                 var file = ts.getDeclarationOfKind(symbol, 294);
                 if (!file) {
                     var equivalentFileSymbol = ts.firstDefined(symbol.declarations, function (d) { return getFileSymbolIfFileSymbolExportEqualsContainer(d, symbol); });
@@ -38513,7 +38512,7 @@ var ts;
                     var moduleResolverHost = context.tracker.moduleResolverHost;
                     var specifierCompilerOptions = isBundle_1 ? __assign(__assign({}, compilerOptions), { baseUrl: moduleResolverHost.getCommonSourceDirectory() }) : compilerOptions;
                     specifier = ts.first(ts.moduleSpecifiers.getModuleSpecifiers(symbol, specifierCompilerOptions, contextFile, moduleResolverHost, { importModuleSpecifierPreference: isBundle_1 ? "non-relative" : "relative" }));
-                    (_a = (_b = links).specifierCache) !== null && _a !== void 0 ? _a : (_b.specifierCache = new ts.Map());
+                    (_a = links.specifierCache) !== null && _a !== void 0 ? _a : (links.specifierCache = new ts.Map());
                     links.specifierCache.set(contextFile.path, specifier);
                 }
                 return specifier;
@@ -87713,7 +87712,7 @@ var ts;
                         perDirectoryResolution.set(name, resolution);
                     }
                     resolutionsInFile.set(name, resolution);
-                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName);
+                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName, noResolveResolution);
                     if (existingResolution) {
                         stopWatchFailedLookupLocationOfResolution(existingResolution, path, getResolutionWithResolvedFileName);
                     }
@@ -87836,14 +87835,14 @@ var ts;
         function isPathWithDefaultFailedLookupExtension(path) {
             return ts.fileExtensionIsOneOf(path, failedLookupDefaultExtensions);
         }
-        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName) {
+        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName, noResolveResolution) {
             if (resolution.refCount) {
                 resolution.refCount++;
                 ts.Debug.assertDefined(resolution.files);
             }
             else {
                 resolution.refCount = 1;
-                ts.Debug.assert(resolution.files === undefined);
+                ts.Debug.assert(resolution.files === undefined || (resolution === noResolveResolution && ts.length(noResolveResolution.files) === 0));
                 if (ts.isExternalModuleNameRelative(name)) {
                     watchFailedLookupLocationOfResolution(resolution);
                 }
diff --git a/lib/tsserver.js b/lib/tsserver.js
index a72724045af..0df27d7480d 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -79,7 +79,7 @@ var __extends = (this && this.__extends) || (function () {
     var extendStatics = function (d, b) {
         extendStatics = Object.setPrototypeOf ||
             ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
         return extendStatics(d, b);
     };
     return function (d, b) {
@@ -46896,7 +46896,6 @@ var ts;
             }
             function getSpecifierForModuleSymbol(symbol, context) {
                 var _a;
-                var _b;
                 var file = ts.getDeclarationOfKind(symbol, 294 /* SourceFile */);
                 if (!file) {
                     var equivalentFileSymbol = ts.firstDefined(symbol.declarations, function (d) { return getFileSymbolIfFileSymbolExportEqualsContainer(d, symbol); });
@@ -46941,7 +46940,7 @@ var ts;
                     var moduleResolverHost = context.tracker.moduleResolverHost;
                     var specifierCompilerOptions = isBundle_1 ? __assign(__assign({}, compilerOptions), { baseUrl: moduleResolverHost.getCommonSourceDirectory() }) : compilerOptions;
                     specifier = ts.first(ts.moduleSpecifiers.getModuleSpecifiers(symbol, specifierCompilerOptions, contextFile, moduleResolverHost, { importModuleSpecifierPreference: isBundle_1 ? "non-relative" : "relative" }));
-                    (_a = (_b = links).specifierCache) !== null && _a !== void 0 ? _a : (_b.specifierCache = new ts.Map());
+                    (_a = links.specifierCache) !== null && _a !== void 0 ? _a : (links.specifierCache = new ts.Map());
                     links.specifierCache.set(contextFile.path, specifier);
                 }
                 return specifier;
@@ -106973,7 +106972,7 @@ var ts;
                         perDirectoryResolution.set(name, resolution);
                     }
                     resolutionsInFile.set(name, resolution);
-                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName);
+                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName, noResolveResolution);
                     if (existingResolution) {
                         stopWatchFailedLookupLocationOfResolution(existingResolution, path, getResolutionWithResolvedFileName);
                     }
@@ -107104,14 +107103,14 @@ var ts;
         function isPathWithDefaultFailedLookupExtension(path) {
             return ts.fileExtensionIsOneOf(path, failedLookupDefaultExtensions);
         }
-        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName) {
+        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName, noResolveResolution) {
             if (resolution.refCount) {
                 resolution.refCount++;
                 ts.Debug.assertDefined(resolution.files);
             }
             else {
                 resolution.refCount = 1;
-                ts.Debug.assert(resolution.files === undefined);
+                ts.Debug.assert(resolution.files === undefined || (resolution === noResolveResolution && ts.length(noResolveResolution.files) === 0));
                 if (ts.isExternalModuleNameRelative(name)) {
                     watchFailedLookupLocationOfResolution(resolution);
                 }
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index 9ac64998266..22aafc034a6 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -78,7 +78,7 @@ var __extends = (this && this.__extends) || (function () {
     var extendStatics = function (d, b) {
         extendStatics = Object.setPrototypeOf ||
             ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
         return extendStatics(d, b);
     };
     return function (d, b) {
@@ -47090,7 +47090,6 @@ var ts;
             }
             function getSpecifierForModuleSymbol(symbol, context) {
                 var _a;
-                var _b;
                 var file = ts.getDeclarationOfKind(symbol, 294 /* SourceFile */);
                 if (!file) {
                     var equivalentFileSymbol = ts.firstDefined(symbol.declarations, function (d) { return getFileSymbolIfFileSymbolExportEqualsContainer(d, symbol); });
@@ -47135,7 +47134,7 @@ var ts;
                     var moduleResolverHost = context.tracker.moduleResolverHost;
                     var specifierCompilerOptions = isBundle_1 ? __assign(__assign({}, compilerOptions), { baseUrl: moduleResolverHost.getCommonSourceDirectory() }) : compilerOptions;
                     specifier = ts.first(ts.moduleSpecifiers.getModuleSpecifiers(symbol, specifierCompilerOptions, contextFile, moduleResolverHost, { importModuleSpecifierPreference: isBundle_1 ? "non-relative" : "relative" }));
-                    (_a = (_b = links).specifierCache) !== null && _a !== void 0 ? _a : (_b.specifierCache = new ts.Map());
+                    (_a = links.specifierCache) !== null && _a !== void 0 ? _a : (links.specifierCache = new ts.Map());
                     links.specifierCache.set(contextFile.path, specifier);
                 }
                 return specifier;
@@ -107167,7 +107166,7 @@ var ts;
                         perDirectoryResolution.set(name, resolution);
                     }
                     resolutionsInFile.set(name, resolution);
-                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName);
+                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName, noResolveResolution);
                     if (existingResolution) {
                         stopWatchFailedLookupLocationOfResolution(existingResolution, path, getResolutionWithResolvedFileName);
                     }
@@ -107298,14 +107297,14 @@ var ts;
         function isPathWithDefaultFailedLookupExtension(path) {
             return ts.fileExtensionIsOneOf(path, failedLookupDefaultExtensions);
         }
-        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName) {
+        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName, noResolveResolution) {
             if (resolution.refCount) {
                 resolution.refCount++;
                 ts.Debug.assertDefined(resolution.files);
             }
             else {
                 resolution.refCount = 1;
-                ts.Debug.assert(resolution.files === undefined);
+                ts.Debug.assert(resolution.files === undefined || (resolution === noResolveResolution && ts.length(noResolveResolution.files) === 0));
                 if (ts.isExternalModuleNameRelative(name)) {
                     watchFailedLookupLocationOfResolution(resolution);
                 }
diff --git a/lib/typescript.js b/lib/typescript.js
index ebbbc6fc146..17d0cccb744 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -78,7 +78,7 @@ var __extends = (this && this.__extends) || (function () {
     var extendStatics = function (d, b) {
         extendStatics = Object.setPrototypeOf ||
             ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
         return extendStatics(d, b);
     };
     return function (d, b) {
@@ -47090,7 +47090,6 @@ var ts;
             }
             function getSpecifierForModuleSymbol(symbol, context) {
                 var _a;
-                var _b;
                 var file = ts.getDeclarationOfKind(symbol, 294 /* SourceFile */);
                 if (!file) {
                     var equivalentFileSymbol = ts.firstDefined(symbol.declarations, function (d) { return getFileSymbolIfFileSymbolExportEqualsContainer(d, symbol); });
@@ -47135,7 +47134,7 @@ var ts;
                     var moduleResolverHost = context.tracker.moduleResolverHost;
                     var specifierCompilerOptions = isBundle_1 ? __assign(__assign({}, compilerOptions), { baseUrl: moduleResolverHost.getCommonSourceDirectory() }) : compilerOptions;
                     specifier = ts.first(ts.moduleSpecifiers.getModuleSpecifiers(symbol, specifierCompilerOptions, contextFile, moduleResolverHost, { importModuleSpecifierPreference: isBundle_1 ? "non-relative" : "relative" }));
-                    (_a = (_b = links).specifierCache) !== null && _a !== void 0 ? _a : (_b.specifierCache = new ts.Map());
+                    (_a = links.specifierCache) !== null && _a !== void 0 ? _a : (links.specifierCache = new ts.Map());
                     links.specifierCache.set(contextFile.path, specifier);
                 }
                 return specifier;
@@ -107167,7 +107166,7 @@ var ts;
                         perDirectoryResolution.set(name, resolution);
                     }
                     resolutionsInFile.set(name, resolution);
-                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName);
+                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName, noResolveResolution);
                     if (existingResolution) {
                         stopWatchFailedLookupLocationOfResolution(existingResolution, path, getResolutionWithResolvedFileName);
                     }
@@ -107298,14 +107297,14 @@ var ts;
         function isPathWithDefaultFailedLookupExtension(path) {
             return ts.fileExtensionIsOneOf(path, failedLookupDefaultExtensions);
         }
-        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName) {
+        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName, noResolveResolution) {
             if (resolution.refCount) {
                 resolution.refCount++;
                 ts.Debug.assertDefined(resolution.files);
             }
             else {
                 resolution.refCount = 1;
-                ts.Debug.assert(resolution.files === undefined);
+                ts.Debug.assert(resolution.files === undefined || (resolution === noResolveResolution && ts.length(noResolveResolution.files) === 0));
                 if (ts.isExternalModuleNameRelative(name)) {
                     watchFailedLookupLocationOfResolution(resolution);
                 }
diff --git a/lib/typescriptServices.js b/lib/typescriptServices.js
index 11a50515b34..c47133f64d4 100644
--- a/lib/typescriptServices.js
+++ b/lib/typescriptServices.js
@@ -78,7 +78,7 @@ var __extends = (this && this.__extends) || (function () {
     var extendStatics = function (d, b) {
         extendStatics = Object.setPrototypeOf ||
             ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
         return extendStatics(d, b);
     };
     return function (d, b) {
@@ -47090,7 +47090,6 @@ var ts;
             }
             function getSpecifierForModuleSymbol(symbol, context) {
                 var _a;
-                var _b;
                 var file = ts.getDeclarationOfKind(symbol, 294 /* SourceFile */);
                 if (!file) {
                     var equivalentFileSymbol = ts.firstDefined(symbol.declarations, function (d) { return getFileSymbolIfFileSymbolExportEqualsContainer(d, symbol); });
@@ -47135,7 +47134,7 @@ var ts;
                     var moduleResolverHost = context.tracker.moduleResolverHost;
                     var specifierCompilerOptions = isBundle_1 ? __assign(__assign({}, compilerOptions), { baseUrl: moduleResolverHost.getCommonSourceDirectory() }) : compilerOptions;
                     specifier = ts.first(ts.moduleSpecifiers.getModuleSpecifiers(symbol, specifierCompilerOptions, contextFile, moduleResolverHost, { importModuleSpecifierPreference: isBundle_1 ? "non-relative" : "relative" }));
-                    (_a = (_b = links).specifierCache) !== null && _a !== void 0 ? _a : (_b.specifierCache = new ts.Map());
+                    (_a = links.specifierCache) !== null && _a !== void 0 ? _a : (links.specifierCache = new ts.Map());
                     links.specifierCache.set(contextFile.path, specifier);
                 }
                 return specifier;
@@ -107167,7 +107166,7 @@ var ts;
                         perDirectoryResolution.set(name, resolution);
                     }
                     resolutionsInFile.set(name, resolution);
-                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName);
+                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName, noResolveResolution);
                     if (existingResolution) {
                         stopWatchFailedLookupLocationOfResolution(existingResolution, path, getResolutionWithResolvedFileName);
                     }
@@ -107298,14 +107297,14 @@ var ts;
         function isPathWithDefaultFailedLookupExtension(path) {
             return ts.fileExtensionIsOneOf(path, failedLookupDefaultExtensions);
         }
-        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName) {
+        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName, noResolveResolution) {
             if (resolution.refCount) {
                 resolution.refCount++;
                 ts.Debug.assertDefined(resolution.files);
             }
             else {
                 resolution.refCount = 1;
-                ts.Debug.assert(resolution.files === undefined);
+                ts.Debug.assert(resolution.files === undefined || (resolution === noResolveResolution && ts.length(noResolveResolution.files) === 0));
                 if (ts.isExternalModuleNameRelative(name)) {
                     watchFailedLookupLocationOfResolution(resolution);
                 }
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index 4afd311aa57..7b09eb89478 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -68,7 +68,7 @@ var __extends = (this && this.__extends) || (function () {
     var extendStatics = function (d, b) {
         extendStatics = Object.setPrototypeOf ||
             ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
-            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
         return extendStatics(d, b);
     };
     return function (d, b) {
@@ -46885,7 +46885,6 @@ var ts;
             }
             function getSpecifierForModuleSymbol(symbol, context) {
                 var _a;
-                var _b;
                 var file = ts.getDeclarationOfKind(symbol, 294 /* SourceFile */);
                 if (!file) {
                     var equivalentFileSymbol = ts.firstDefined(symbol.declarations, function (d) { return getFileSymbolIfFileSymbolExportEqualsContainer(d, symbol); });
@@ -46930,7 +46929,7 @@ var ts;
                     var moduleResolverHost = context.tracker.moduleResolverHost;
                     var specifierCompilerOptions = isBundle_1 ? __assign(__assign({}, compilerOptions), { baseUrl: moduleResolverHost.getCommonSourceDirectory() }) : compilerOptions;
                     specifier = ts.first(ts.moduleSpecifiers.getModuleSpecifiers(symbol, specifierCompilerOptions, contextFile, moduleResolverHost, { importModuleSpecifierPreference: isBundle_1 ? "non-relative" : "relative" }));
-                    (_a = (_b = links).specifierCache) !== null && _a !== void 0 ? _a : (_b.specifierCache = new ts.Map());
+                    (_a = links.specifierCache) !== null && _a !== void 0 ? _a : (links.specifierCache = new ts.Map());
                     links.specifierCache.set(contextFile.path, specifier);
                 }
                 return specifier;
@@ -106962,7 +106961,7 @@ var ts;
                         perDirectoryResolution.set(name, resolution);
                     }
                     resolutionsInFile.set(name, resolution);
-                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName);
+                    watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, path, getResolutionWithResolvedFileName, noResolveResolution);
                     if (existingResolution) {
                         stopWatchFailedLookupLocationOfResolution(existingResolution, path, getResolutionWithResolvedFileName);
                     }
@@ -107093,14 +107092,14 @@ var ts;
         function isPathWithDefaultFailedLookupExtension(path) {
             return ts.fileExtensionIsOneOf(path, failedLookupDefaultExtensions);
         }
-        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName) {
+        function watchFailedLookupLocationsOfExternalModuleResolutions(name, resolution, filePath, getResolutionWithResolvedFileName, noResolveResolution) {
             if (resolution.refCount) {
                 resolution.refCount++;
                 ts.Debug.assertDefined(resolution.files);
             }
             else {
                 resolution.refCount = 1;
-                ts.Debug.assert(resolution.files === undefined);
+                ts.Debug.assert(resolution.files === undefined || (resolution === noResolveResolution && ts.length(noResolveResolution.files) === 0));
                 if (ts.isExternalModuleNameRelative(name)) {
                     watchFailedLookupLocationOfResolution(resolution);
                 }