diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 505714108e3..4b1ab123051 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -10891,7 +10891,11 @@ namespace ts {
         }
 
         function getAliasSymbolForTypeNode(node: TypeNode) {
-            return isTypeAlias(node.parent) ? getSymbolOfNode(node.parent) : undefined;
+            let host = node.parent;
+            while (isParenthesizedTypeNode(host)) {
+                host = host.parent;
+            }
+            return isTypeAlias(host) ? getSymbolOfNode(host) : undefined;
         }
 
         function getTypeArgumentsForAliasSymbol(symbol: Symbol | undefined) {
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 0bd4693875e..cdfacf6a9ee 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -5116,6 +5116,10 @@
         "category": "Message",
         "code": 95088
     },
+    "Add 'await' to initializers": {
+        "category": "Message",
+        "code": 95089
+    },
 
     "No value exists in scope for the shorthand property '{0}'. Either declare one or provide an initializer.": {
         "category": "Error",
diff --git a/src/compiler/resolutionCache.ts b/src/compiler/resolutionCache.ts
index 414dc509d0f..49f1fd26bc3 100644
--- a/src/compiler/resolutionCache.ts
+++ b/src/compiler/resolutionCache.ts
@@ -90,14 +90,28 @@ namespace ts {
             return false;
         }
 
-        const nextDirectorySeparator = dirPath.indexOf(directorySeparator, rootLength);
+        let nextDirectorySeparator = dirPath.indexOf(directorySeparator, rootLength);
         if (nextDirectorySeparator === -1) {
             // ignore "/user", "c:/users" or "c:/folderAtRoot"
             return false;
         }
 
-        if (dirPath.charCodeAt(0) !== CharacterCodes.slash &&
-            dirPath.substr(rootLength, nextDirectorySeparator).search(/users/i) === -1) {
+        let pathPartForUserCheck = dirPath.substring(rootLength, nextDirectorySeparator + 1);
+        const isNonDirectorySeparatorRoot = rootLength > 1 || dirPath.charCodeAt(0) !== CharacterCodes.slash;
+        if (isNonDirectorySeparatorRoot &&
+            dirPath.search(/[a-zA-Z]:/) !== 0 && // Non dos style paths
+            pathPartForUserCheck.search(/[a-zA-z]\$\//) === 0) { // Dos style nextPart
+            nextDirectorySeparator = dirPath.indexOf(directorySeparator, nextDirectorySeparator + 1);
+            if (nextDirectorySeparator === -1) {
+                // ignore "//vda1cs4850/c$/folderAtRoot"
+                return false;
+            }
+
+            pathPartForUserCheck = dirPath.substring(rootLength + pathPartForUserCheck.length, nextDirectorySeparator + 1);
+        }
+
+        if (isNonDirectorySeparatorRoot &&
+            pathPartForUserCheck.search(/users\//i) !== 0) {
             // Paths like c:/folderAtRoot/subFolder are allowed
             return true;
         }
@@ -105,7 +119,7 @@ namespace ts {
         for (let searchIndex = nextDirectorySeparator + 1, searchLevels = 2; searchLevels > 0; searchLevels--) {
             searchIndex = dirPath.indexOf(directorySeparator, searchIndex) + 1;
             if (searchIndex === 0) {
-                // Folder isnt at expected minimun levels
+                // Folder isnt at expected minimum levels
                 return false;
             }
         }
diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index 6695d6ab86c..ad60d29866d 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -2183,7 +2183,7 @@ namespace ts {
 
             if (isIdentifierStart(ch, languageVersion)) {
                 let char = ch;
-                while (pos < end && isIdentifierPart(char = codePointAt(text, pos), languageVersion)) pos += charSize(char);
+                while (pos < end && isIdentifierPart(char = codePointAt(text, pos), languageVersion) || text.charCodeAt(pos) === CharacterCodes.minus) pos += charSize(char);
                 tokenValue = text.substring(tokenPos, pos);
                 if (char === CharacterCodes.backslash) {
                     tokenValue += scanIdentifierParts();
diff --git a/src/harness/virtualFileSystemWithWatch.ts b/src/harness/virtualFileSystemWithWatch.ts
index 435582a9c2e..1a2fd5f4cc8 100644
--- a/src/harness/virtualFileSystemWithWatch.ts
+++ b/src/harness/virtualFileSystemWithWatch.ts
@@ -35,38 +35,16 @@ interface Array<T> { length: number; [n: number]: T; }`
         executingFilePath?: string;
         currentDirectory?: string;
         newLine?: string;
-        useWindowsStylePaths?: boolean;
+        windowsStyleRoot?: string;
         environmentVariables?: Map<string>;
     }
 
     export function createWatchedSystem(fileOrFolderList: readonly FileOrFolderOrSymLink[], params?: TestServerHostCreationParameters): TestServerHost {
-        if (!params) {
-            params = {};
-        }
-        const host = new TestServerHost(/*withSafelist*/ false,
-            params.useCaseSensitiveFileNames !== undefined ? params.useCaseSensitiveFileNames : false,
-            params.executingFilePath || getExecutingFilePathFromLibFile(),
-            params.currentDirectory || "/",
-            fileOrFolderList,
-            params.newLine,
-            params.useWindowsStylePaths,
-            params.environmentVariables);
-        return host;
+        return new TestServerHost(/*withSafelist*/ false, fileOrFolderList, params);
     }
 
     export function createServerHost(fileOrFolderList: readonly FileOrFolderOrSymLink[], params?: TestServerHostCreationParameters): TestServerHost {
-        if (!params) {
-            params = {};
-        }
-        const host = new TestServerHost(/*withSafelist*/ true,
-            params.useCaseSensitiveFileNames !== undefined ? params.useCaseSensitiveFileNames : false,
-            params.executingFilePath || getExecutingFilePathFromLibFile(),
-            params.currentDirectory || "/",
-            fileOrFolderList,
-            params.newLine,
-            params.useWindowsStylePaths,
-            params.environmentVariables);
-        return host;
+        return new TestServerHost(/*withSafelist*/ true, fileOrFolderList, params);
     }
 
     export interface File {
@@ -326,6 +304,16 @@ interface Array<T> { length: number; [n: number]: T; }`
     }
 
     const timeIncrements = 1000;
+    export interface TestServerHostOptions {
+        useCaseSensitiveFileNames: boolean;
+        executingFilePath: string;
+        currentDirectory: string;
+        fileOrFolderorSymLinkList: readonly FileOrFolderOrSymLink[];
+        newLine?: string;
+        useWindowsStylePaths?: boolean;
+        environmentVariables?: Map<string>;
+    }
+
     export class TestServerHost implements server.ServerHost, FormatDiagnosticsHost, ModuleResolutionHost {
         args: string[] = [];
 
@@ -342,16 +330,31 @@ interface Array<T> { length: number; [n: number]: T; }`
         readonly watchedDirectories = createMultiMap<TestDirectoryWatcher>();
         readonly watchedDirectoriesRecursive = createMultiMap<TestDirectoryWatcher>();
         readonly watchedFiles = createMultiMap<TestFileWatcher>();
+        public readonly useCaseSensitiveFileNames: boolean;
+        public readonly newLine: string;
+        public readonly windowsStyleRoot?: string;
+        private readonly environmentVariables?: Map<string>;
         private readonly executingFilePath: string;
         private readonly currentDirectory: string;
         private readonly customWatchFile: HostWatchFile | undefined;
         private readonly customRecursiveWatchDirectory: HostWatchDirectory | undefined;
         public require: ((initialPath: string, moduleName: string) => server.RequireResult) | undefined;
 
-        constructor(public withSafeList: boolean, public useCaseSensitiveFileNames: boolean, executingFilePath: string, currentDirectory: string, fileOrFolderorSymLinkList: readonly FileOrFolderOrSymLink[], public readonly newLine = "\n", public readonly useWindowsStylePath?: boolean, private readonly environmentVariables?: Map<string>) {
-            this.getCanonicalFileName = createGetCanonicalFileName(useCaseSensitiveFileNames);
+        constructor(
+            public withSafeList: boolean,
+            fileOrFolderorSymLinkList: readonly FileOrFolderOrSymLink[],
+            {
+                useCaseSensitiveFileNames, executingFilePath, currentDirectory,
+                newLine, windowsStyleRoot, environmentVariables
+            }: TestServerHostCreationParameters = {}) {
+            this.useCaseSensitiveFileNames = !!useCaseSensitiveFileNames;
+            this.newLine = newLine || "\n";
+            this.windowsStyleRoot = windowsStyleRoot;
+            this.environmentVariables = environmentVariables;
+            currentDirectory = currentDirectory || "/";
+            this.getCanonicalFileName = createGetCanonicalFileName(!!useCaseSensitiveFileNames);
             this.toPath = s => toPath(s, currentDirectory, this.getCanonicalFileName);
-            this.executingFilePath = this.getHostSpecificPath(executingFilePath);
+            this.executingFilePath = this.getHostSpecificPath(executingFilePath || getExecutingFilePathFromLibFile());
             this.currentDirectory = this.getHostSpecificPath(currentDirectory);
             this.reloadFS(fileOrFolderorSymLinkList);
             const tscWatchFile = this.environmentVariables && this.environmentVariables.get("TSC_WATCHFILE") as Tsc_WatchFile;
@@ -418,8 +421,8 @@ interface Array<T> { length: number; [n: number]: T; }`
         }
 
         getHostSpecificPath(s: string) {
-            if (this.useWindowsStylePath && s.startsWith(directorySeparator)) {
-                return "c:/" + s.substring(1);
+            if (this.windowsStyleRoot && s.startsWith(directorySeparator)) {
+                return this.windowsStyleRoot + s.substring(1);
             }
             return s;
         }
@@ -433,7 +436,7 @@ interface Array<T> { length: number; [n: number]: T; }`
             const mapNewLeaves = createMap<true>();
             const isNewFs = this.fs.size === 0;
             fileOrFolderOrSymLinkList = fileOrFolderOrSymLinkList.concat(this.withSafeList ? safeList : []);
-            const filesOrFoldersToLoad: readonly FileOrFolderOrSymLink[] = !this.useWindowsStylePath ? fileOrFolderOrSymLinkList :
+            const filesOrFoldersToLoad: readonly FileOrFolderOrSymLink[] = !this.windowsStyleRoot ? fileOrFolderOrSymLinkList :
                 fileOrFolderOrSymLinkList.map<FileOrFolderOrSymLink>(f => {
                     const result = clone(f);
                     result.path = this.getHostSpecificPath(f.path);
diff --git a/src/services/codefixes/addMissingAwait.ts b/src/services/codefixes/addMissingAwait.ts
index d6f5773d59a..233c91b153b 100644
--- a/src/services/codefixes/addMissingAwait.ts
+++ b/src/services/codefixes/addMissingAwait.ts
@@ -31,7 +31,7 @@ namespace ts.codefix {
         errorCodes,
         getCodeActions: context => {
             const { sourceFile, errorCode, span, cancellationToken, program } = context;
-            const expression = getAwaitableExpression(sourceFile, errorCode, span, cancellationToken, program);
+            const expression = getFixableErrorSpanExpression(sourceFile, errorCode, span, cancellationToken, program);
             if (!expression) {
                 return;
             }
@@ -45,32 +45,40 @@ namespace ts.codefix {
         getAllCodeActions: context => {
             const { sourceFile, program, cancellationToken } = context;
             const checker = context.program.getTypeChecker();
+            const fixedDeclarations = createMap<true>();
             return codeFixAll(context, errorCodes, (t, diagnostic) => {
-                const expression = getAwaitableExpression(sourceFile, diagnostic.code, diagnostic, cancellationToken, program);
+                const expression = getFixableErrorSpanExpression(sourceFile, diagnostic.code, diagnostic, cancellationToken, program);
                 if (!expression) {
                     return;
                 }
                 const trackChanges: ContextualTrackChangesFunction = cb => (cb(t), []);
-                return getDeclarationSiteFix(context, expression, diagnostic.code, checker, trackChanges)
-                    || getUseSiteFix(context, expression, diagnostic.code, checker, trackChanges);
+                return getDeclarationSiteFix(context, expression, diagnostic.code, checker, trackChanges, fixedDeclarations)
+                    || getUseSiteFix(context, expression, diagnostic.code, checker, trackChanges, fixedDeclarations);
             });
         },
     });
 
-    function getDeclarationSiteFix(context: CodeFixContext | CodeFixAllContext, expression: Expression, errorCode: number, checker: TypeChecker, trackChanges: ContextualTrackChangesFunction) {
-        const { sourceFile } = context;
-        const awaitableInitializer = findAwaitableInitializer(expression, sourceFile, checker);
-        if (awaitableInitializer) {
-            const initializerChanges = trackChanges(t => makeChange(t, errorCode, sourceFile, checker, awaitableInitializer));
+    function getDeclarationSiteFix(context: CodeFixContext | CodeFixAllContext, expression: Expression, errorCode: number, checker: TypeChecker, trackChanges: ContextualTrackChangesFunction, fixedDeclarations?: Map<true>) {
+        const { sourceFile, program, cancellationToken } = context;
+        const awaitableInitializers = findAwaitableInitializers(expression, sourceFile, cancellationToken, program, checker);
+        if (awaitableInitializers) {
+            const initializerChanges = trackChanges(t => {
+                forEach(awaitableInitializers.initializers, ({ expression }) => makeChange(t, errorCode, sourceFile, checker, expression, fixedDeclarations));
+                if (fixedDeclarations && awaitableInitializers.needsSecondPassForFixAll) {
+                    makeChange(t, errorCode, sourceFile, checker, expression, fixedDeclarations);
+                }
+            });
             return createCodeFixActionNoFixId(
                 "addMissingAwaitToInitializer",
                 initializerChanges,
-                [Diagnostics.Add_await_to_initializer_for_0, expression.getText(sourceFile)]);
+                awaitableInitializers.initializers.length === 1
+                    ? [Diagnostics.Add_await_to_initializer_for_0, awaitableInitializers.initializers[0].declarationSymbol.name]
+                    : Diagnostics.Add_await_to_initializers);
         }
     }
 
-    function getUseSiteFix(context: CodeFixContext | CodeFixAllContext, expression: Expression, errorCode: number, checker: TypeChecker, trackChanges: ContextualTrackChangesFunction) {
-        const changes = trackChanges(t => makeChange(t, errorCode, context.sourceFile, checker, expression));
+    function getUseSiteFix(context: CodeFixContext | CodeFixAllContext, expression: Expression, errorCode: number, checker: TypeChecker, trackChanges: ContextualTrackChangesFunction, fixedDeclarations?: Map<true>) {
+        const changes = trackChanges(t => makeChange(t, errorCode, context.sourceFile, checker, expression, fixedDeclarations));
         return createCodeFixAction(fixId, changes, Diagnostics.Add_await, fixId, Diagnostics.Fix_all_expressions_possibly_missing_await);
     }
 
@@ -84,7 +92,7 @@ namespace ts.codefix {
             some(relatedInformation, related => related.code === Diagnostics.Did_you_forget_to_use_await.code));
     }
 
-    function getAwaitableExpression(sourceFile: SourceFile, errorCode: number, span: TextSpan, cancellationToken: CancellationToken, program: Program): Expression | undefined {
+    function getFixableErrorSpanExpression(sourceFile: SourceFile, errorCode: number, span: TextSpan, cancellationToken: CancellationToken, program: Program): Expression | undefined {
         const token = getTokenAtPosition(sourceFile, span.start);
         // Checker has already done work to determine that await might be possible, and has attached
         // related info to the node, so start by finding the expression that exactly matches up
@@ -101,38 +109,117 @@ namespace ts.codefix {
             && isInsideAwaitableBody(expression) ? expression : undefined;
     }
 
-    function findAwaitableInitializer(expression: Node, sourceFile: SourceFile, checker: TypeChecker): Expression | undefined {
-        if (!isIdentifier(expression)) {
+    interface AwaitableInitializer {
+        expression: Expression;
+        declarationSymbol: Symbol;
+    }
+
+    interface AwaitableInitializers {
+        initializers: readonly AwaitableInitializer[];
+        needsSecondPassForFixAll: boolean;
+    }
+
+    function findAwaitableInitializers(
+        expression: Node,
+        sourceFile: SourceFile,
+        cancellationToken: CancellationToken,
+        program: Program,
+        checker: TypeChecker,
+    ): AwaitableInitializers | undefined {
+        const identifiers = getIdentifiersFromErrorSpanExpression(expression, checker);
+        if (!identifiers) {
             return;
         }
 
-        const symbol = checker.getSymbolAtLocation(expression);
-        if (!symbol) {
-            return;
+        let isCompleteFix = identifiers.isCompleteFix;
+        let initializers: AwaitableInitializer[] | undefined;
+        for (const identifier of identifiers.identifiers) {
+            const symbol = checker.getSymbolAtLocation(identifier);
+            if (!symbol) {
+                continue;
+            }
+
+            const declaration = tryCast(symbol.valueDeclaration, isVariableDeclaration);
+            const variableName = declaration && tryCast(declaration.name, isIdentifier);
+            const variableStatement = getAncestor(declaration, SyntaxKind.VariableStatement);
+            if (!declaration || !variableStatement ||
+                declaration.type ||
+                !declaration.initializer ||
+                variableStatement.getSourceFile() !== sourceFile ||
+                hasModifier(variableStatement, ModifierFlags.Export) ||
+                !variableName ||
+                !isInsideAwaitableBody(declaration.initializer)) {
+                isCompleteFix = false;
+                continue;
+            }
+
+            const diagnostics = program.getSemanticDiagnostics(sourceFile, cancellationToken);
+            const isUsedElsewhere = FindAllReferences.Core.eachSymbolReferenceInFile(variableName, checker, sourceFile, reference => {
+                return identifier !== reference && !symbolReferenceIsAlsoMissingAwait(reference, diagnostics, sourceFile, checker);
+            });
+
+            if (isUsedElsewhere) {
+                isCompleteFix = false;
+                continue;
+            }
+
+            (initializers || (initializers = [])).push({
+                expression: declaration.initializer,
+                declarationSymbol: symbol,
+            });
         }
+        return initializers && {
+            initializers,
+            needsSecondPassForFixAll: !isCompleteFix,
+        };
+    }
 
-        const declaration = tryCast(symbol.valueDeclaration, isVariableDeclaration);
-        const variableName = tryCast(declaration && declaration.name, isIdentifier);
-        const variableStatement = getAncestor(declaration, SyntaxKind.VariableStatement);
-        if (!declaration || !variableStatement ||
-            declaration.type ||
-            !declaration.initializer ||
-            variableStatement.getSourceFile() !== sourceFile ||
-            hasModifier(variableStatement, ModifierFlags.Export) ||
-            !variableName ||
-            !isInsideAwaitableBody(declaration.initializer)) {
-            return;
+    interface Identifiers {
+        identifiers: readonly Identifier[];
+        isCompleteFix: boolean;
+    }
+
+    function getIdentifiersFromErrorSpanExpression(expression: Node, checker: TypeChecker): Identifiers | undefined {
+        if (isPropertyAccessExpression(expression.parent) && isIdentifier(expression.parent.expression)) {
+            return { identifiers: [expression.parent.expression], isCompleteFix: true };
         }
-
-        const isUsedElsewhere = FindAllReferences.Core.eachSymbolReferenceInFile(variableName, checker, sourceFile, identifier => {
-            return identifier !== expression;
-        });
-
-        if (isUsedElsewhere) {
-            return;
+        if (isIdentifier(expression)) {
+            return { identifiers: [expression], isCompleteFix: true };
         }
+        if (isBinaryExpression(expression)) {
+            let sides: Identifier[] | undefined;
+            let isCompleteFix = true;
+            for (const side of [expression.left, expression.right]) {
+                const type = checker.getTypeAtLocation(side);
+                if (checker.getPromisedTypeOfPromise(type)) {
+                    if (!isIdentifier(side)) {
+                        isCompleteFix = false;
+                        continue;
+                    }
+                    (sides || (sides = [])).push(side);
+                }
+            }
+            return sides && { identifiers: sides, isCompleteFix };
+        }
+    }
 
-        return declaration.initializer;
+    function symbolReferenceIsAlsoMissingAwait(reference: Identifier, diagnostics: readonly Diagnostic[], sourceFile: SourceFile, checker: TypeChecker) {
+        const errorNode = isPropertyAccessExpression(reference.parent) ? reference.parent.name :
+            isBinaryExpression(reference.parent) ? reference.parent :
+            reference;
+        const diagnostic = find(diagnostics, diagnostic =>
+            diagnostic.start === errorNode.getStart(sourceFile) &&
+            diagnostic.start + diagnostic.length! === errorNode.getEnd());
+
+        return diagnostic && contains(errorCodes, diagnostic.code) ||
+            // A Promise is usually not correct in a binary expression (it’s not valid
+            // in an arithmetic expression and an equality comparison seems unusual),
+            // but if the other side of the binary expression has an error, the side
+            // is typed `any` which will squash the error that would identify this
+            // Promise as an invalid operand. So if the whole binary expression is
+            // typed `any` as a result, there is a strong likelihood that this Promise
+            // is accidentally missing `await`.
+            checker.getTypeAtLocation(errorNode).flags & TypeFlags.Any;
     }
 
     function isInsideAwaitableBody(node: Node) {
@@ -145,26 +232,48 @@ namespace ts.codefix {
                 ancestor.parent.kind === SyntaxKind.MethodDeclaration));
     }
 
-    function makeChange(changeTracker: textChanges.ChangeTracker, errorCode: number, sourceFile: SourceFile, checker: TypeChecker, insertionSite: Expression) {
+    function makeChange(changeTracker: textChanges.ChangeTracker, errorCode: number, sourceFile: SourceFile, checker: TypeChecker, insertionSite: Expression, fixedDeclarations?: Map<true>) {
         if (isBinaryExpression(insertionSite)) {
-            const { left, right } = insertionSite;
-            const leftType = checker.getTypeAtLocation(left);
-            const rightType = checker.getTypeAtLocation(right);
-            const newLeft = checker.getPromisedTypeOfPromise(leftType) ? createAwait(left) : left;
-            const newRight = checker.getPromisedTypeOfPromise(rightType) ? createAwait(right) : right;
-            changeTracker.replaceNode(sourceFile, left, newLeft);
-            changeTracker.replaceNode(sourceFile, right, newRight);
+            for (const side of [insertionSite.left, insertionSite.right]) {
+                if (fixedDeclarations && isIdentifier(side)) {
+                    const symbol = checker.getSymbolAtLocation(side);
+                    if (symbol && fixedDeclarations.has(getSymbolId(symbol).toString())) {
+                        continue;
+                    }
+                }
+                const type = checker.getTypeAtLocation(side);
+                const newNode = checker.getPromisedTypeOfPromise(type) ? createAwait(side) : side;
+                changeTracker.replaceNode(sourceFile, side, newNode);
+            }
         }
         else if (errorCode === propertyAccessCode && isPropertyAccessExpression(insertionSite.parent)) {
+            if (fixedDeclarations && isIdentifier(insertionSite.parent.expression)) {
+                const symbol = checker.getSymbolAtLocation(insertionSite.parent.expression);
+                if (symbol && fixedDeclarations.has(getSymbolId(symbol).toString())) {
+                    return;
+                }
+            }
             changeTracker.replaceNode(
                 sourceFile,
                 insertionSite.parent.expression,
                 createParen(createAwait(insertionSite.parent.expression)));
         }
         else if (contains(callableConstructableErrorCodes, errorCode) && isCallOrNewExpression(insertionSite.parent)) {
+            if (fixedDeclarations && isIdentifier(insertionSite)) {
+                const symbol = checker.getSymbolAtLocation(insertionSite);
+                if (symbol && fixedDeclarations.has(getSymbolId(symbol).toString())) {
+                    return;
+                }
+            }
             changeTracker.replaceNode(sourceFile, insertionSite, createParen(createAwait(insertionSite)));
         }
         else {
+            if (fixedDeclarations && isVariableDeclaration(insertionSite.parent) && isIdentifier(insertionSite.parent.name)) {
+                const symbol = checker.getSymbolAtLocation(insertionSite.parent.name);
+                if (symbol && !addToSeen(fixedDeclarations, getSymbolId(symbol))) {
+                    return;
+                }
+            }
             changeTracker.replaceNode(sourceFile, insertionSite, createAwait(insertionSite));
         }
     }
diff --git a/src/testRunner/parallel/host.ts b/src/testRunner/parallel/host.ts
index dfd187d09f7..56fa17dd9e1 100644
--- a/src/testRunner/parallel/host.ts
+++ b/src/testRunner/parallel/host.ts
@@ -626,6 +626,7 @@ namespace Harness.Parallel.Host {
 
             const perfData = readSavedPerfData(configOption);
             context.describe = addSuite as Mocha.SuiteFunction;
+            context.it = addSuite as Mocha.TestFunction;
 
             function addSuite(title: string) {
                 // Note, sub-suites are not indexed (we assume such granularity is not required)
diff --git a/src/testRunner/parallel/worker.ts b/src/testRunner/parallel/worker.ts
index ccb654d964c..a7c22ab6eb7 100644
--- a/src/testRunner/parallel/worker.ts
+++ b/src/testRunner/parallel/worker.ts
@@ -151,24 +151,42 @@ namespace Harness.Parallel.Worker {
                     unitTestSuiteMap.set(suite.title, suite);
                 }
             }
+            if (!unitTestTestMap && unitTestSuite.tests.length) {
+                unitTestTestMap = ts.createMap<Mocha.Test>();
+                for (const test of unitTestSuite.tests) {
+                    unitTestTestMap.set(test.title, test);
+                }
+            }
 
-            if (!unitTestSuiteMap) {
+            if (!unitTestSuiteMap && !unitTestTestMap) {
                 throw new Error(`Asked to run unit test ${task.file}, but no unit tests were discovered!`);
             }
 
-            const suite = unitTestSuiteMap.get(task.file);
-            if (!suite) {
+            let suite = unitTestSuiteMap.get(task.file);
+            const test = unitTestTestMap.get(task.file);
+            if (!suite && !test) {
                 throw new Error(`Unit test with name "${task.file}" was asked to be run, but such a test does not exist!`);
             }
 
             const root = new Suite("", new Mocha.Context());
             root.timeout(globalTimeout || 40_000);
-            root.addSuite(suite);
-            Object.setPrototypeOf(suite.ctx, root.ctx);
+            if (suite) {
+                root.addSuite(suite);
+                Object.setPrototypeOf(suite.ctx, root.ctx);
+            }
+            else if (test) {
+                const newSuite = new Suite("", new Mocha.Context());
+                newSuite.addTest(test);
+                root.addSuite(newSuite);
+                Object.setPrototypeOf(newSuite.ctx, root.ctx);
+                Object.setPrototypeOf(test.ctx, root.ctx);
+                test.parent = newSuite;
+                suite = newSuite;
+            }
 
-            runSuite(task, suite, payload => {
-                suite.parent = unitTestSuite;
-                Object.setPrototypeOf(suite.ctx, unitTestSuite.ctx);
+            runSuite(task, suite!, payload => {
+                suite!.parent = unitTestSuite;
+                Object.setPrototypeOf(suite!.ctx, unitTestSuite.ctx);
                 fn(payload);
             });
         }
@@ -284,6 +302,8 @@ namespace Harness.Parallel.Worker {
         // The root suite for all unit tests.
         let unitTestSuite: Suite;
         let unitTestSuiteMap: ts.Map<Mocha.Suite>;
+        // (Unit) Tests directly within the root suite
+        let unitTestTestMap: ts.Map<Mocha.Test>;
 
         if (runUnitTests) {
             unitTestSuite = new Suite("", new Mocha.Context());
diff --git a/src/testRunner/unittests/tsserver/projects.ts b/src/testRunner/unittests/tsserver/projects.ts
index 35d1dc374b5..7d92949b526 100644
--- a/src/testRunner/unittests/tsserver/projects.ts
+++ b/src/testRunner/unittests/tsserver/projects.ts
@@ -1064,7 +1064,7 @@ namespace ts.projectSystem {
                 content: "let x = 1;"
             };
 
-            const host = createServerHost([file1, configFile], { useWindowsStylePaths: true });
+            const host = createServerHost([file1, configFile], { windowsStyleRoot: "c:/" });
             const projectService = createProjectService(host);
 
             projectService.openClientFile(file1.path);
diff --git a/src/testRunner/unittests/tsserver/watchEnvironment.ts b/src/testRunner/unittests/tsserver/watchEnvironment.ts
index 5e776aa9908..63afebab2f6 100644
--- a/src/testRunner/unittests/tsserver/watchEnvironment.ts
+++ b/src/testRunner/unittests/tsserver/watchEnvironment.ts
@@ -99,7 +99,7 @@ namespace ts.projectSystem {
                 content: "let y = 10;"
             };
             const files = [configFile, file1, file2, libFile];
-            const host = createServerHost(files, { useWindowsStylePaths: true });
+            const host = createServerHost(files, { windowsStyleRoot: "c:/" });
             const projectService = createProjectService(host);
             projectService.openClientFile(file1.path);
             const project = projectService.configuredProjects.get(configFile.path)!;
@@ -211,4 +211,39 @@ namespace ts.projectSystem {
         }
     });
 
+    describe("unittests:: tsserver:: watchEnvironment:: tsserverProjectSystem watching files with network style paths", () => {
+        function verifyFilePathStyle(path: string) {
+            const windowsStyleRoot = path.substr(0, getRootLength(path));
+            const host = createServerHost(
+                [libFile, { path, content: "const x = 10" }],
+                { windowsStyleRoot }
+            );
+            const service = createProjectService(host);
+            service.openClientFile(path);
+            checkNumberOfProjects(service, { inferredProjects: 1 });
+            const libPath = `${windowsStyleRoot}${libFile.path.substring(1)}`;
+            checkProjectActualFiles(service.inferredProjects[0], [path, libPath]);
+            checkWatchedFiles(host, [libPath, `${getDirectoryPath(path)}/tsconfig.json`, `${getDirectoryPath(path)}/jsconfig.json`]);
+        }
+
+        it("for file of style c:/myprojects/project/x.js", () => {
+            verifyFilePathStyle("c:/myprojects/project/x.js");
+        });
+
+        it("for file of style //vda1cs4850/myprojects/project/x.js", () => {
+            verifyFilePathStyle("//vda1cs4850/myprojects/project/x.js");
+        });
+
+        it("for file of style //vda1cs4850/c$/myprojects/project/x.js", () => {
+            verifyFilePathStyle("//vda1cs4850/c$/myprojects/project/x.js");
+        });
+
+        it("for file of style c:/users/username/myprojects/project/x.js", () => {
+            verifyFilePathStyle("c:/users/username/myprojects/project/x.js");
+        });
+
+        it("for file of style //vda1cs4850/c$/users/username/myprojects/project/x.js", () => {
+            verifyFilePathStyle("//vda1cs4850/c$/users/username/myprojects/project/x.js");
+        });
+    });
 }
diff --git a/tests/baselines/reference/destructuringInFunctionType.types b/tests/baselines/reference/destructuringInFunctionType.types
index 2ef48fcbea2..c6c0f439ac5 100644
--- a/tests/baselines/reference/destructuringInFunctionType.types
+++ b/tests/baselines/reference/destructuringInFunctionType.types
@@ -18,7 +18,7 @@ type F1 = ([a, b, c]) => void;
 >c : any
 
 type T2 = ({ a });
->T2 : { a: any; }
+>T2 : T2
 >a : any
 
 type F2 = ({ a }) => void;
diff --git a/tests/baselines/reference/keyofIntersection.types b/tests/baselines/reference/keyofIntersection.types
index b1c0fe8988c..ddef2cd4b1a 100644
--- a/tests/baselines/reference/keyofIntersection.types
+++ b/tests/baselines/reference/keyofIntersection.types
@@ -46,7 +46,7 @@ type Result3 = Example3<'x' | 'y'>;  // "x" | "y"
 >Result3 : "x" | "y"
 
 type Example4<T extends string, U extends string> = (Record<T, any> & Record<U, any>);
->Example4 : Record<T, any> & Record<U, any>
+>Example4 : Example4<T, U>
 
 type Result4 = keyof Example4<'x', 'y'>;  // "x" | "y"
 >Result4 : "x" | "y"
diff --git a/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.js b/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.js
new file mode 100644
index 00000000000..6a779f7cdf9
--- /dev/null
+++ b/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.js
@@ -0,0 +1,49 @@
+//// [parenthesisDoesNotBlockAliasSymbolCreation.ts]
+export type InvalidKeys<K extends string|number|symbol> = { [P in K]? : never };
+export type InvalidKeys2<K extends string|number|symbol> = (
+    { [P in K]? : never }
+);
+
+export type A<T> = (
+    T & InvalidKeys<"a">
+);
+export type A2<T> = (
+    T & InvalidKeys2<"a">
+);
+
+export const a = null as A<{ x : number }>;
+export const a2 = null as A2<{ x : number }>;
+export const a3 = null as { x : number } & InvalidKeys<"a">;
+export const a4 = null as { x : number } & InvalidKeys2<"a">;
+
+
+//// [parenthesisDoesNotBlockAliasSymbolCreation.js]
+"use strict";
+exports.__esModule = true;
+exports.a = null;
+exports.a2 = null;
+exports.a3 = null;
+exports.a4 = null;
+
+
+//// [parenthesisDoesNotBlockAliasSymbolCreation.d.ts]
+export declare type InvalidKeys<K extends string | number | symbol> = {
+    [P in K]?: never;
+};
+export declare type InvalidKeys2<K extends string | number | symbol> = ({
+    [P in K]?: never;
+});
+export declare type A<T> = (T & InvalidKeys<"a">);
+export declare type A2<T> = (T & InvalidKeys2<"a">);
+export declare const a: A<{
+    x: number;
+}>;
+export declare const a2: A2<{
+    x: number;
+}>;
+export declare const a3: {
+    x: number;
+} & InvalidKeys<"a">;
+export declare const a4: {
+    x: number;
+} & InvalidKeys2<"a">;
diff --git a/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.symbols b/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.symbols
new file mode 100644
index 00000000000..83c9bf4deed
--- /dev/null
+++ b/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.symbols
@@ -0,0 +1,56 @@
+=== tests/cases/compiler/parenthesisDoesNotBlockAliasSymbolCreation.ts ===
+export type InvalidKeys<K extends string|number|symbol> = { [P in K]? : never };
+>InvalidKeys : Symbol(InvalidKeys, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 0))
+>K : Symbol(K, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 24))
+>P : Symbol(P, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 61))
+>K : Symbol(K, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 24))
+
+export type InvalidKeys2<K extends string|number|symbol> = (
+>InvalidKeys2 : Symbol(InvalidKeys2, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 80))
+>K : Symbol(K, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 1, 25))
+
+    { [P in K]? : never }
+>P : Symbol(P, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 2, 7))
+>K : Symbol(K, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 1, 25))
+
+);
+
+export type A<T> = (
+>A : Symbol(A, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 3, 2))
+>T : Symbol(T, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 5, 14))
+
+    T & InvalidKeys<"a">
+>T : Symbol(T, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 5, 14))
+>InvalidKeys : Symbol(InvalidKeys, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 0))
+
+);
+export type A2<T> = (
+>A2 : Symbol(A2, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 7, 2))
+>T : Symbol(T, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 8, 15))
+
+    T & InvalidKeys2<"a">
+>T : Symbol(T, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 8, 15))
+>InvalidKeys2 : Symbol(InvalidKeys2, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 80))
+
+);
+
+export const a = null as A<{ x : number }>;
+>a : Symbol(a, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 12, 12))
+>A : Symbol(A, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 3, 2))
+>x : Symbol(x, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 12, 28))
+
+export const a2 = null as A2<{ x : number }>;
+>a2 : Symbol(a2, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 13, 12))
+>A2 : Symbol(A2, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 7, 2))
+>x : Symbol(x, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 13, 30))
+
+export const a3 = null as { x : number } & InvalidKeys<"a">;
+>a3 : Symbol(a3, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 14, 12))
+>x : Symbol(x, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 14, 27))
+>InvalidKeys : Symbol(InvalidKeys, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 0))
+
+export const a4 = null as { x : number } & InvalidKeys2<"a">;
+>a4 : Symbol(a4, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 15, 12))
+>x : Symbol(x, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 15, 27))
+>InvalidKeys2 : Symbol(InvalidKeys2, Decl(parenthesisDoesNotBlockAliasSymbolCreation.ts, 0, 80))
+
diff --git a/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.types b/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.types
new file mode 100644
index 00000000000..5bf53abed1c
--- /dev/null
+++ b/tests/baselines/reference/parenthesisDoesNotBlockAliasSymbolCreation.types
@@ -0,0 +1,45 @@
+=== tests/cases/compiler/parenthesisDoesNotBlockAliasSymbolCreation.ts ===
+export type InvalidKeys<K extends string|number|symbol> = { [P in K]? : never };
+>InvalidKeys : InvalidKeys<K>
+
+export type InvalidKeys2<K extends string|number|symbol> = (
+>InvalidKeys2 : InvalidKeys2<K>
+
+    { [P in K]? : never }
+);
+
+export type A<T> = (
+>A : A<T>
+
+    T & InvalidKeys<"a">
+);
+export type A2<T> = (
+>A2 : A2<T>
+
+    T & InvalidKeys2<"a">
+);
+
+export const a = null as A<{ x : number }>;
+>a : A<{ x: number; }>
+>null as A<{ x : number }> : A<{ x: number; }>
+>null : null
+>x : number
+
+export const a2 = null as A2<{ x : number }>;
+>a2 : A2<{ x: number; }>
+>null as A2<{ x : number }> : A2<{ x: number; }>
+>null : null
+>x : number
+
+export const a3 = null as { x : number } & InvalidKeys<"a">;
+>a3 : { x: number; } & InvalidKeys<"a">
+>null as { x : number } & InvalidKeys<"a"> : { x: number; } & InvalidKeys<"a">
+>null : null
+>x : number
+
+export const a4 = null as { x : number } & InvalidKeys2<"a">;
+>a4 : { x: number; } & InvalidKeys2<"a">
+>null as { x : number } & InvalidKeys2<"a"> : { x: number; } & InvalidKeys2<"a">
+>null : null
+>x : number
+
diff --git a/tests/baselines/reference/tsbuild/moduleSpecifiers/initial-build/resolves-correctly.js b/tests/baselines/reference/tsbuild/moduleSpecifiers/initial-build/resolves-correctly.js
index a664688e748..2ba8fa80817 100644
--- a/tests/baselines/reference/tsbuild/moduleSpecifiers/initial-build/resolves-correctly.js
+++ b/tests/baselines/reference/tsbuild/moduleSpecifiers/initial-build/resolves-correctly.js
@@ -14,8 +14,8 @@ exports.__esModule = true;
   "program": {
     "fileInfos": {
       "../../../.ts/lib.es5.d.ts": {
-        "version": "146944634190",
-        "signature": "146944634190"
+        "version": "406734842058",
+        "signature": "406734842058"
       },
       "../../../.ts/lib.es2015.d.ts": {
         "version": "57263133672",
@@ -114,8 +114,8 @@ exports.__esModule = true;
   "program": {
     "fileInfos": {
       "../../../.ts/lib.es5.d.ts": {
-        "version": "146944634190",
-        "signature": "146944634190"
+        "version": "406734842058",
+        "signature": "406734842058"
       },
       "../../../.ts/lib.es2015.d.ts": {
         "version": "57263133672",
@@ -237,8 +237,8 @@ exports.getVar = getVar;
   "program": {
     "fileInfos": {
       "../../../.ts/lib.es5.d.ts": {
-        "version": "146944634190",
-        "signature": "146944634190"
+        "version": "406734842058",
+        "signature": "406734842058"
       },
       "../../../.ts/lib.es2015.d.ts": {
         "version": "57263133672",
diff --git a/tests/cases/compiler/parenthesisDoesNotBlockAliasSymbolCreation.ts b/tests/cases/compiler/parenthesisDoesNotBlockAliasSymbolCreation.ts
new file mode 100644
index 00000000000..0f8e993bbd6
--- /dev/null
+++ b/tests/cases/compiler/parenthesisDoesNotBlockAliasSymbolCreation.ts
@@ -0,0 +1,18 @@
+// @declaration: true
+
+export type InvalidKeys<K extends string|number|symbol> = { [P in K]? : never };
+export type InvalidKeys2<K extends string|number|symbol> = (
+    { [P in K]? : never }
+);
+
+export type A<T> = (
+    T & InvalidKeys<"a">
+);
+export type A2<T> = (
+    T & InvalidKeys2<"a">
+);
+
+export const a = null as A<{ x : number }>;
+export const a2 = null as A2<{ x : number }>;
+export const a3 = null as { x : number } & InvalidKeys<"a">;
+export const a4 = null as { x : number } & InvalidKeys2<"a">;
diff --git a/tests/cases/fourslash/codeFixAddMissingAwait_initializer.ts b/tests/cases/fourslash/codeFixAddMissingAwait_initializer1.ts
similarity index 100%
rename from tests/cases/fourslash/codeFixAddMissingAwait_initializer.ts
rename to tests/cases/fourslash/codeFixAddMissingAwait_initializer1.ts
diff --git a/tests/cases/fourslash/codeFixAddMissingAwait_initializer2.ts b/tests/cases/fourslash/codeFixAddMissingAwait_initializer2.ts
new file mode 100644
index 00000000000..4f5d604d448
--- /dev/null
+++ b/tests/cases/fourslash/codeFixAddMissingAwait_initializer2.ts
@@ -0,0 +1,15 @@
+/// <reference path="fourslash.ts" />
+////async function fn(a: Promise<string>) {
+////  const x = a;
+////  x.toLowerCase();
+////}
+
+verify.codeFix({
+  description: "Add 'await' to initializer for 'x'",
+  index: 0,
+  newFileContent:
+`async function fn(a: Promise<string>) {
+  const x = await a;
+  x.toLowerCase();
+}`
+});
diff --git a/tests/cases/fourslash/codeFixAddMissingAwait_initializer3.ts b/tests/cases/fourslash/codeFixAddMissingAwait_initializer3.ts
new file mode 100644
index 00000000000..9fd6cad6420
--- /dev/null
+++ b/tests/cases/fourslash/codeFixAddMissingAwait_initializer3.ts
@@ -0,0 +1,31 @@
+/// <reference path="fourslash.ts" />
+////async function fn(a: number, b: Promise<number>) {
+////  const x = b;
+////  const y = b;
+////  fn(x, b);
+////  fn(y, b);
+////  x.toFixed();
+////  y.then;
+////
+////  b + b;
+////  x + b;
+////  x + x.toFixed();
+////}
+
+verify.codeFixAll({
+  fixAllDescription: ts.Diagnostics.Fix_all_expressions_possibly_missing_await.message,
+  fixId: "addMissingAwait",
+  newFileContent:
+`async function fn(a: number, b: Promise<number>) {
+  const x = await b;
+  const y = b;
+  fn(x, b);
+  fn(await y, b);
+  x.toFixed();
+  y.then;
+
+  await b + await b;
+  x + await b;
+  x + x.toFixed();
+}`
+});
diff --git a/tests/cases/fourslash/codeFixAddMissingAwait_initializer4.ts b/tests/cases/fourslash/codeFixAddMissingAwait_initializer4.ts
new file mode 100644
index 00000000000..3106eaeccb6
--- /dev/null
+++ b/tests/cases/fourslash/codeFixAddMissingAwait_initializer4.ts
@@ -0,0 +1,28 @@
+/// <reference path="fourslash.ts" />
+////async function fn(a: string, b: Promise<string>) {
+////  const x = b;
+////  const y = b;
+////  x + y;
+////}
+
+verify.codeFix({
+  description: "Add 'await' to initializers",
+  index: 0,
+  newFileContent:
+`async function fn(a: string, b: Promise<string>) {
+  const x = await b;
+  const y = await b;
+  x + y;
+}`
+});
+
+verify.codeFixAll({
+  fixAllDescription: ts.Diagnostics.Fix_all_expressions_possibly_missing_await.message,
+  fixId: "addMissingAwait",
+  newFileContent:
+`async function fn(a: string, b: Promise<string>) {
+  const x = await b;
+  const y = await b;
+  x + y;
+}`
+});
diff --git a/tests/cases/fourslash/jsDocTagsWithHyphen.ts b/tests/cases/fourslash/jsDocTagsWithHyphen.ts
new file mode 100644
index 00000000000..188c4298bcb
--- /dev/null
+++ b/tests/cases/fourslash/jsDocTagsWithHyphen.ts
@@ -0,0 +1,24 @@
+///<reference path="fourslash.ts" />
+// @allowJs: true
+// @Filename: dummy.js
+
+//// /**
+////  * @typedef Product
+////  * @property {string} title
+////  * @property {boolean} h/*1*/igh-top some-comments
+////  */
+//// 
+//// /**
+////  * @type {Pro/*2*/duct}
+////  */
+//// const product = {
+////     /*3*/
+//// }
+verify.quickInfoAt('1', '(property) high-top: boolean', 'some-comments');
+
+verify.quickInfoAt('2', 'type Product = {\n    title: string;\n    high-top: boolean;\n}');
+
+verify.completions({
+  marker: ['3'],
+  includes: ['"high-top"']
+});
diff --git a/tests/cases/user/prettier/prettier b/tests/cases/user/prettier/prettier
index 23146404850..1e471a00796 160000
--- a/tests/cases/user/prettier/prettier
+++ b/tests/cases/user/prettier/prettier
@@ -1 +1 @@
-Subproject commit 23146404850011972f695fb6bc2b8113c3cffbfc
+Subproject commit 1e471a007968b7490563b91ed6909ae6046f3fe8