diff --git a/lib/tsc.js b/lib/tsc.js
index 676a6234c8d91..d11299cf5462f 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -65,7 +65,7 @@ var __generator = (this && this.__generator) || function (thisArg, body) {
 var ts;
 (function (ts) {
     ts.versionMajorMinor = "4.3";
-    ts.version = "4.3.3";
+    ts.version = "4.3.4";
     var NativeCollections;
     (function (NativeCollections) {
         function tryGetNativeMap() {
@@ -13497,56 +13497,43 @@ var ts;
         }
         return __assign(__assign({}, writer), { writeTrailingSemicolon: function () {
                 pendingTrailingSemicolon = true;
-            },
-            writeLiteral: function (s) {
+            }, writeLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeLiteral(s);
-            },
-            writeStringLiteral: function (s) {
+            }, writeStringLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeStringLiteral(s);
-            },
-            writeSymbol: function (s, sym) {
+            }, writeSymbol: function (s, sym) {
                 commitPendingTrailingSemicolon();
                 writer.writeSymbol(s, sym);
-            },
-            writePunctuation: function (s) {
+            }, writePunctuation: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writePunctuation(s);
-            },
-            writeKeyword: function (s) {
+            }, writeKeyword: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeKeyword(s);
-            },
-            writeOperator: function (s) {
+            }, writeOperator: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeOperator(s);
-            },
-            writeParameter: function (s) {
+            }, writeParameter: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeParameter(s);
-            },
-            writeSpace: function (s) {
+            }, writeSpace: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeSpace(s);
-            },
-            writeProperty: function (s) {
+            }, writeProperty: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeProperty(s);
-            },
-            writeComment: function (s) {
+            }, writeComment: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeComment(s);
-            },
-            writeLine: function () {
+            }, writeLine: function () {
                 commitPendingTrailingSemicolon();
                 writer.writeLine();
-            },
-            increaseIndent: function () {
+            }, increaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.increaseIndent();
-            },
-            decreaseIndent: function () {
+            }, decreaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.decreaseIndent();
             } });
@@ -32857,9 +32844,7 @@ var ts;
         var preDirectoryResolutionCache = createPerDirectoryResolutionCache(currentDirectory, getCanonicalFileName, directoryToModuleNameMap || (directoryToModuleNameMap = createCacheWithRedirects(options)));
         moduleNameToDirectoryMap || (moduleNameToDirectoryMap = createCacheWithRedirects(options));
         var packageJsonInfoCache = createPackageJsonInfoCache(currentDirectory, getCanonicalFileName);
-        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName,
-            clear: clear,
-            update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
+        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName, clear: clear, update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
         function clear() {
             preDirectoryResolutionCache.clear();
             moduleNameToDirectoryMap.clear();
@@ -96307,7 +96292,7 @@ var ts;
                 },
                 emit: function (targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
                     if (targetSourceFile || emitOnlyDtsFiles) {
-                        return withProgramOrUndefined(function (program) { return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers); });
+                        return withProgramOrUndefined(function (program) { var _a, _b; return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project))); });
                     }
                     executeSteps(BuildStep.SemanticDiagnostics, cancellationToken);
                     if (step === BuildStep.EmitBuildInfo) {
@@ -96389,13 +96374,14 @@ var ts;
         }
         function emit(writeFileCallback, cancellationToken, customTransformers) {
             var _a;
+            var _b, _c;
             ts.Debug.assertIsDefined(program);
             ts.Debug.assert(step === BuildStep.Emit);
             program.backupState();
             var declDiagnostics;
             var reportDeclarationDiagnostics = function (d) { return (declDiagnostics || (declDiagnostics = [])).push(d); };
             var outputFiles = [];
-            var emitResult = ts.emitFilesAndReportErrors(program, reportDeclarationDiagnostics, undefined, undefined, function (name, text, writeByteOrderMark) { return outputFiles.push({ name: name, text: text, writeByteOrderMark: writeByteOrderMark }); }, cancellationToken, false, customTransformers).emitResult;
+            var emitResult = ts.emitFilesAndReportErrors(program, reportDeclarationDiagnostics, undefined, undefined, function (name, text, writeByteOrderMark) { return outputFiles.push({ name: name, text: text, writeByteOrderMark: writeByteOrderMark }); }, cancellationToken, false, customTransformers || ((_c = (_b = state.host).getCustomTransformers) === null || _c === void 0 ? void 0 : _c.call(_b, project))).emitResult;
             if (declDiagnostics) {
                 program.restoreState();
                 (_a = buildErrors(state, projectPath, program, config, declDiagnostics, BuildResultFlags.DeclarationEmitErrors, "Declaration file"), buildResult = _a.buildResult, step = _a.step);
@@ -96472,6 +96458,7 @@ var ts;
             return emitDiagnostics;
         }
         function emitBundle(writeFileCallback, customTransformers) {
+            var _a, _b;
             ts.Debug.assert(kind === InvalidatedProjectKind.UpdateBundle);
             if (state.options.dry) {
                 reportStatus(state, ts.Diagnostics.A_non_dry_build_would_update_output_of_project_0, project);
@@ -96486,7 +96473,7 @@ var ts;
             var outputFiles = ts.emitUsingBuildInfo(config, compilerHost, function (ref) {
                 var refName = resolveProjectName(state, ref.path);
                 return parseConfigFile(state, refName, toResolvedConfigFilePath(state, refName));
-            }, customTransformers);
+            }, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project)));
             if (ts.isString(outputFiles)) {
                 reportStatus(state, ts.Diagnostics.Cannot_update_output_of_project_0_because_there_was_error_reading_file_1, project, relName(state, outputFiles));
                 step = BuildStep.BuildInvalidatedProjectOfBundle;
diff --git a/lib/tsserver.js b/lib/tsserver.js
index 6ff08da17dfb1..66a3b91b10740 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -96,7 +96,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.3.3";
+    ts.version = "4.3.4";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -17321,56 +17321,43 @@ var ts;
         }
         return __assign(__assign({}, writer), { writeTrailingSemicolon: function () {
                 pendingTrailingSemicolon = true;
-            },
-            writeLiteral: function (s) {
+            }, writeLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeLiteral(s);
-            },
-            writeStringLiteral: function (s) {
+            }, writeStringLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeStringLiteral(s);
-            },
-            writeSymbol: function (s, sym) {
+            }, writeSymbol: function (s, sym) {
                 commitPendingTrailingSemicolon();
                 writer.writeSymbol(s, sym);
-            },
-            writePunctuation: function (s) {
+            }, writePunctuation: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writePunctuation(s);
-            },
-            writeKeyword: function (s) {
+            }, writeKeyword: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeKeyword(s);
-            },
-            writeOperator: function (s) {
+            }, writeOperator: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeOperator(s);
-            },
-            writeParameter: function (s) {
+            }, writeParameter: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeParameter(s);
-            },
-            writeSpace: function (s) {
+            }, writeSpace: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeSpace(s);
-            },
-            writeProperty: function (s) {
+            }, writeProperty: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeProperty(s);
-            },
-            writeComment: function (s) {
+            }, writeComment: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeComment(s);
-            },
-            writeLine: function () {
+            }, writeLine: function () {
                 commitPendingTrailingSemicolon();
                 writer.writeLine();
-            },
-            increaseIndent: function () {
+            }, increaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.increaseIndent();
-            },
-            decreaseIndent: function () {
+            }, decreaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.decreaseIndent();
             } });
@@ -40305,9 +40292,7 @@ var ts;
         var preDirectoryResolutionCache = createPerDirectoryResolutionCache(currentDirectory, getCanonicalFileName, directoryToModuleNameMap || (directoryToModuleNameMap = createCacheWithRedirects(options)));
         moduleNameToDirectoryMap || (moduleNameToDirectoryMap = createCacheWithRedirects(options));
         var packageJsonInfoCache = createPackageJsonInfoCache(currentDirectory, getCanonicalFileName);
-        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName,
-            clear: clear,
-            update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
+        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName, clear: clear, update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
         function clear() {
             preDirectoryResolutionCache.clear();
             moduleNameToDirectoryMap.clear();
@@ -116658,7 +116643,7 @@ var ts;
                 },
                 emit: function (targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
                     if (targetSourceFile || emitOnlyDtsFiles) {
-                        return withProgramOrUndefined(function (program) { return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers); });
+                        return withProgramOrUndefined(function (program) { var _a, _b; return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project))); });
                     }
                     executeSteps(BuildStep.SemanticDiagnostics, cancellationToken);
                     if (step === BuildStep.EmitBuildInfo) {
@@ -116743,6 +116728,7 @@ var ts;
         }
         function emit(writeFileCallback, cancellationToken, customTransformers) {
             var _a;
+            var _b, _c;
             ts.Debug.assertIsDefined(program);
             ts.Debug.assert(step === BuildStep.Emit);
             // Before emitting lets backup state, so we can revert it back if there are declaration errors to handle emit and declaration errors correctly
@@ -116753,7 +116739,7 @@ var ts;
             var emitResult = ts.emitFilesAndReportErrors(program, reportDeclarationDiagnostics, 
             /*write*/ undefined, 
             /*reportSummary*/ undefined, function (name, text, writeByteOrderMark) { return outputFiles.push({ name: name, text: text, writeByteOrderMark: writeByteOrderMark }); }, cancellationToken, 
-            /*emitOnlyDts*/ false, customTransformers).emitResult;
+            /*emitOnlyDts*/ false, customTransformers || ((_c = (_b = state.host).getCustomTransformers) === null || _c === void 0 ? void 0 : _c.call(_b, project))).emitResult;
             // Don't emit .d.ts if there are decl file errors
             if (declDiagnostics) {
                 program.restoreState();
@@ -116835,6 +116821,7 @@ var ts;
             return emitDiagnostics;
         }
         function emitBundle(writeFileCallback, customTransformers) {
+            var _a, _b;
             ts.Debug.assert(kind === InvalidatedProjectKind.UpdateBundle);
             if (state.options.dry) {
                 reportStatus(state, ts.Diagnostics.A_non_dry_build_would_update_output_of_project_0, project);
@@ -116850,7 +116837,7 @@ var ts;
             var outputFiles = ts.emitUsingBuildInfo(config, compilerHost, function (ref) {
                 var refName = resolveProjectName(state, ref.path);
                 return parseConfigFile(state, refName, toResolvedConfigFilePath(state, refName));
-            }, customTransformers);
+            }, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project)));
             if (ts.isString(outputFiles)) {
                 reportStatus(state, ts.Diagnostics.Cannot_update_output_of_project_0_because_there_was_error_reading_file_1, project, relName(state, outputFiles));
                 step = BuildStep.BuildInvalidatedProjectOfBundle;
@@ -120743,9 +120730,7 @@ var ts;
             [8 /* OptionalDependencies */, info.optionalDependencies],
             [4 /* PeerDependencies */, info.peerDependencies],
         ];
-        return __assign(__assign({}, info), { parseable: !!content, fileName: fileName,
-            get: get,
-            has: function (dependencyName, inGroups) {
+        return __assign(__assign({}, info), { parseable: !!content, fileName: fileName, get: get, has: function (dependencyName, inGroups) {
                 return !!get(dependencyName, inGroups);
             } });
         function get(dependencyName, inGroups) {
@@ -127171,9 +127156,7 @@ var ts;
                         var name_1 = displayParts_1.map(function (p) { return p.text; }).join("");
                         var declaration = symbol.declarations && ts.firstOrUndefined(symbol.declarations);
                         var node = declaration ? (ts.getNameOfDeclaration(declaration) || declaration) : originalNode;
-                        return __assign(__assign({}, getFileAndTextSpanFromNode(node)), { name: name_1,
-                            kind: kind_1,
-                            displayParts: displayParts_1, context: getContextNode(declaration) });
+                        return __assign(__assign({}, getFileAndTextSpanFromNode(node)), { name: name_1, kind: kind_1, displayParts: displayParts_1, context: getContextNode(declaration) });
                     }
                     case 1 /* Label */: {
                         var node = def.node;
@@ -127208,10 +127191,7 @@ var ts;
                 }
             })();
             var sourceFile = info.sourceFile, textSpan = info.textSpan, name = info.name, kind = info.kind, displayParts = info.displayParts, context = info.context;
-            return __assign({ containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind,
-                name: name,
-                textSpan: textSpan,
-                displayParts: displayParts }, toContextSpan(textSpan, sourceFile, context));
+            return __assign({ containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind, name: name, textSpan: textSpan, displayParts: displayParts }, toContextSpan(textSpan, sourceFile, context));
         }
         function getFileAndTextSpanFromNode(node) {
             var sourceFile = node.getSourceFile();
@@ -165367,9 +165347,7 @@ var ts;
             var span = toProtocolTextSpanWithContext(textSpan, contextSpan, scriptInfo);
             var lineSpan = scriptInfo.lineToTextSpan(span.start.line - 1);
             var lineText = scriptInfo.getSnapshot().getText(lineSpan.start, ts.textSpanEnd(lineSpan)).replace(/\r|\n/g, "");
-            return __assign(__assign({ file: fileName }, span), { lineText: lineText,
-                isWriteAccess: isWriteAccess,
-                isDefinition: isDefinition });
+            return __assign(__assign({ file: fileName }, span), { lineText: lineText, isWriteAccess: isWriteAccess, isDefinition: isDefinition });
         }
         function isCompletionEntryData(data) {
             return data === undefined || data && typeof data === "object"
@@ -166301,10 +166279,8 @@ var ts;
         var WorkerSession = /** @class */ (function (_super) {
             __extends(WorkerSession, _super);
             function WorkerSession(host, webHost, options, logger, cancellationToken, hrtime) {
-                var _this = _super.call(this, __assign(__assign({ host: host,
-                    cancellationToken: cancellationToken }, options), { typingsInstaller: server.nullTypingsInstaller, byteLength: ts.notImplemented, // Formats the message text in send of Session which is overriden in this class so not needed
-                    hrtime: hrtime,
-                    logger: logger, canUseEvents: false })) || this;
+                var _this = _super.call(this, __assign(__assign({ host: host, cancellationToken: cancellationToken }, options), { typingsInstaller: server.nullTypingsInstaller, byteLength: ts.notImplemented, // Formats the message text in send of Session which is overriden in this class so not needed
+                    hrtime: hrtime, logger: logger, canUseEvents: false })) || this;
                 _this.webHost = webHost;
                 return _this;
             }
@@ -167805,8 +167781,7 @@ var ts;
                     var typingsInstaller = disableAutomaticTypingAcquisition
                         ? undefined
                         : new NodeTypingsInstaller(telemetryEnabled, logger, host, getGlobalTypingsCacheLocation(), typingSafeListLocation, typesMapLocation, npmLocation, validateDefaultNpmLocation, event);
-                    _this = _super.call(this, __assign(__assign({ host: host,
-                        cancellationToken: cancellationToken }, options), { typingsInstaller: typingsInstaller || server.nullTypingsInstaller, byteLength: Buffer.byteLength, hrtime: process.hrtime, logger: logger, canUseEvents: true, typesMapLocation: typesMapLocation })) || this;
+                    _this = _super.call(this, __assign(__assign({ host: host, cancellationToken: cancellationToken }, options), { typingsInstaller: typingsInstaller || server.nullTypingsInstaller, byteLength: Buffer.byteLength, hrtime: process.hrtime, logger: logger, canUseEvents: true, typesMapLocation: typesMapLocation })) || this;
                     _this.eventPort = eventPort;
                     if (_this.canUseEvents && _this.eventPort) {
                         var s_1 = net.connect({ port: _this.eventPort }, function () {
diff --git a/lib/tsserverlibrary.d.ts b/lib/tsserverlibrary.d.ts
index 6195d669a8306..d6750c44d0a2e 100644
--- a/lib/tsserverlibrary.d.ts
+++ b/lib/tsserverlibrary.d.ts
@@ -5205,6 +5205,7 @@ declare namespace ts {
          * writeFileCallback
          */
         writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        getCustomTransformers?: (project: string) => CustomTransformers | undefined;
         getModifiedTime(fileName: string): Date | undefined;
         setModifiedTime(fileName: string, date: Date): void;
         deleteFile(fileName: string): void;
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index f4f612b263875..bddccf9e0108f 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -290,7 +290,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.3.3";
+    ts.version = "4.3.4";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -17515,56 +17515,43 @@ var ts;
         }
         return __assign(__assign({}, writer), { writeTrailingSemicolon: function () {
                 pendingTrailingSemicolon = true;
-            },
-            writeLiteral: function (s) {
+            }, writeLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeLiteral(s);
-            },
-            writeStringLiteral: function (s) {
+            }, writeStringLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeStringLiteral(s);
-            },
-            writeSymbol: function (s, sym) {
+            }, writeSymbol: function (s, sym) {
                 commitPendingTrailingSemicolon();
                 writer.writeSymbol(s, sym);
-            },
-            writePunctuation: function (s) {
+            }, writePunctuation: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writePunctuation(s);
-            },
-            writeKeyword: function (s) {
+            }, writeKeyword: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeKeyword(s);
-            },
-            writeOperator: function (s) {
+            }, writeOperator: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeOperator(s);
-            },
-            writeParameter: function (s) {
+            }, writeParameter: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeParameter(s);
-            },
-            writeSpace: function (s) {
+            }, writeSpace: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeSpace(s);
-            },
-            writeProperty: function (s) {
+            }, writeProperty: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeProperty(s);
-            },
-            writeComment: function (s) {
+            }, writeComment: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeComment(s);
-            },
-            writeLine: function () {
+            }, writeLine: function () {
                 commitPendingTrailingSemicolon();
                 writer.writeLine();
-            },
-            increaseIndent: function () {
+            }, increaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.increaseIndent();
-            },
-            decreaseIndent: function () {
+            }, decreaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.decreaseIndent();
             } });
@@ -40499,9 +40486,7 @@ var ts;
         var preDirectoryResolutionCache = createPerDirectoryResolutionCache(currentDirectory, getCanonicalFileName, directoryToModuleNameMap || (directoryToModuleNameMap = createCacheWithRedirects(options)));
         moduleNameToDirectoryMap || (moduleNameToDirectoryMap = createCacheWithRedirects(options));
         var packageJsonInfoCache = createPackageJsonInfoCache(currentDirectory, getCanonicalFileName);
-        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName,
-            clear: clear,
-            update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
+        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName, clear: clear, update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
         function clear() {
             preDirectoryResolutionCache.clear();
             moduleNameToDirectoryMap.clear();
@@ -116852,7 +116837,7 @@ var ts;
                 },
                 emit: function (targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
                     if (targetSourceFile || emitOnlyDtsFiles) {
-                        return withProgramOrUndefined(function (program) { return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers); });
+                        return withProgramOrUndefined(function (program) { var _a, _b; return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project))); });
                     }
                     executeSteps(BuildStep.SemanticDiagnostics, cancellationToken);
                     if (step === BuildStep.EmitBuildInfo) {
@@ -116937,6 +116922,7 @@ var ts;
         }
         function emit(writeFileCallback, cancellationToken, customTransformers) {
             var _a;
+            var _b, _c;
             ts.Debug.assertIsDefined(program);
             ts.Debug.assert(step === BuildStep.Emit);
             // Before emitting lets backup state, so we can revert it back if there are declaration errors to handle emit and declaration errors correctly
@@ -116947,7 +116933,7 @@ var ts;
             var emitResult = ts.emitFilesAndReportErrors(program, reportDeclarationDiagnostics, 
             /*write*/ undefined, 
             /*reportSummary*/ undefined, function (name, text, writeByteOrderMark) { return outputFiles.push({ name: name, text: text, writeByteOrderMark: writeByteOrderMark }); }, cancellationToken, 
-            /*emitOnlyDts*/ false, customTransformers).emitResult;
+            /*emitOnlyDts*/ false, customTransformers || ((_c = (_b = state.host).getCustomTransformers) === null || _c === void 0 ? void 0 : _c.call(_b, project))).emitResult;
             // Don't emit .d.ts if there are decl file errors
             if (declDiagnostics) {
                 program.restoreState();
@@ -117029,6 +117015,7 @@ var ts;
             return emitDiagnostics;
         }
         function emitBundle(writeFileCallback, customTransformers) {
+            var _a, _b;
             ts.Debug.assert(kind === InvalidatedProjectKind.UpdateBundle);
             if (state.options.dry) {
                 reportStatus(state, ts.Diagnostics.A_non_dry_build_would_update_output_of_project_0, project);
@@ -117044,7 +117031,7 @@ var ts;
             var outputFiles = ts.emitUsingBuildInfo(config, compilerHost, function (ref) {
                 var refName = resolveProjectName(state, ref.path);
                 return parseConfigFile(state, refName, toResolvedConfigFilePath(state, refName));
-            }, customTransformers);
+            }, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project)));
             if (ts.isString(outputFiles)) {
                 reportStatus(state, ts.Diagnostics.Cannot_update_output_of_project_0_because_there_was_error_reading_file_1, project, relName(state, outputFiles));
                 step = BuildStep.BuildInvalidatedProjectOfBundle;
@@ -121312,9 +121299,7 @@ var ts;
             [8 /* OptionalDependencies */, info.optionalDependencies],
             [4 /* PeerDependencies */, info.peerDependencies],
         ];
-        return __assign(__assign({}, info), { parseable: !!content, fileName: fileName,
-            get: get,
-            has: function (dependencyName, inGroups) {
+        return __assign(__assign({}, info), { parseable: !!content, fileName: fileName, get: get, has: function (dependencyName, inGroups) {
                 return !!get(dependencyName, inGroups);
             } });
         function get(dependencyName, inGroups) {
@@ -127740,9 +127725,7 @@ var ts;
                         var name_1 = displayParts_1.map(function (p) { return p.text; }).join("");
                         var declaration = symbol.declarations && ts.firstOrUndefined(symbol.declarations);
                         var node = declaration ? (ts.getNameOfDeclaration(declaration) || declaration) : originalNode;
-                        return __assign(__assign({}, getFileAndTextSpanFromNode(node)), { name: name_1,
-                            kind: kind_1,
-                            displayParts: displayParts_1, context: getContextNode(declaration) });
+                        return __assign(__assign({}, getFileAndTextSpanFromNode(node)), { name: name_1, kind: kind_1, displayParts: displayParts_1, context: getContextNode(declaration) });
                     }
                     case 1 /* Label */: {
                         var node = def.node;
@@ -127777,10 +127760,7 @@ var ts;
                 }
             })();
             var sourceFile = info.sourceFile, textSpan = info.textSpan, name = info.name, kind = info.kind, displayParts = info.displayParts, context = info.context;
-            return __assign({ containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind,
-                name: name,
-                textSpan: textSpan,
-                displayParts: displayParts }, toContextSpan(textSpan, sourceFile, context));
+            return __assign({ containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind, name: name, textSpan: textSpan, displayParts: displayParts }, toContextSpan(textSpan, sourceFile, context));
         }
         function getFileAndTextSpanFromNode(node) {
             var sourceFile = node.getSourceFile();
@@ -165561,9 +165541,7 @@ var ts;
             var span = toProtocolTextSpanWithContext(textSpan, contextSpan, scriptInfo);
             var lineSpan = scriptInfo.lineToTextSpan(span.start.line - 1);
             var lineText = scriptInfo.getSnapshot().getText(lineSpan.start, ts.textSpanEnd(lineSpan)).replace(/\r|\n/g, "");
-            return __assign(__assign({ file: fileName }, span), { lineText: lineText,
-                isWriteAccess: isWriteAccess,
-                isDefinition: isDefinition });
+            return __assign(__assign({ file: fileName }, span), { lineText: lineText, isWriteAccess: isWriteAccess, isDefinition: isDefinition });
         }
         function isCompletionEntryData(data) {
             return data === undefined || data && typeof data === "object"
diff --git a/lib/typescript.d.ts b/lib/typescript.d.ts
index b86a3a29970a4..0cae15013d02c 100644
--- a/lib/typescript.d.ts
+++ b/lib/typescript.d.ts
@@ -5205,6 +5205,7 @@ declare namespace ts {
          * writeFileCallback
          */
         writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        getCustomTransformers?: (project: string) => CustomTransformers | undefined;
         getModifiedTime(fileName: string): Date | undefined;
         setModifiedTime(fileName: string, date: Date): void;
         deleteFile(fileName: string): void;
diff --git a/lib/typescript.js b/lib/typescript.js
index b3f80f1a315b2..59842e00c5ec4 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -290,7 +290,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.3.3";
+    ts.version = "4.3.4";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -17515,56 +17515,43 @@ var ts;
         }
         return __assign(__assign({}, writer), { writeTrailingSemicolon: function () {
                 pendingTrailingSemicolon = true;
-            },
-            writeLiteral: function (s) {
+            }, writeLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeLiteral(s);
-            },
-            writeStringLiteral: function (s) {
+            }, writeStringLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeStringLiteral(s);
-            },
-            writeSymbol: function (s, sym) {
+            }, writeSymbol: function (s, sym) {
                 commitPendingTrailingSemicolon();
                 writer.writeSymbol(s, sym);
-            },
-            writePunctuation: function (s) {
+            }, writePunctuation: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writePunctuation(s);
-            },
-            writeKeyword: function (s) {
+            }, writeKeyword: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeKeyword(s);
-            },
-            writeOperator: function (s) {
+            }, writeOperator: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeOperator(s);
-            },
-            writeParameter: function (s) {
+            }, writeParameter: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeParameter(s);
-            },
-            writeSpace: function (s) {
+            }, writeSpace: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeSpace(s);
-            },
-            writeProperty: function (s) {
+            }, writeProperty: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeProperty(s);
-            },
-            writeComment: function (s) {
+            }, writeComment: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeComment(s);
-            },
-            writeLine: function () {
+            }, writeLine: function () {
                 commitPendingTrailingSemicolon();
                 writer.writeLine();
-            },
-            increaseIndent: function () {
+            }, increaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.increaseIndent();
-            },
-            decreaseIndent: function () {
+            }, decreaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.decreaseIndent();
             } });
@@ -40499,9 +40486,7 @@ var ts;
         var preDirectoryResolutionCache = createPerDirectoryResolutionCache(currentDirectory, getCanonicalFileName, directoryToModuleNameMap || (directoryToModuleNameMap = createCacheWithRedirects(options)));
         moduleNameToDirectoryMap || (moduleNameToDirectoryMap = createCacheWithRedirects(options));
         var packageJsonInfoCache = createPackageJsonInfoCache(currentDirectory, getCanonicalFileName);
-        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName,
-            clear: clear,
-            update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
+        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName, clear: clear, update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
         function clear() {
             preDirectoryResolutionCache.clear();
             moduleNameToDirectoryMap.clear();
@@ -116852,7 +116837,7 @@ var ts;
                 },
                 emit: function (targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
                     if (targetSourceFile || emitOnlyDtsFiles) {
-                        return withProgramOrUndefined(function (program) { return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers); });
+                        return withProgramOrUndefined(function (program) { var _a, _b; return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project))); });
                     }
                     executeSteps(BuildStep.SemanticDiagnostics, cancellationToken);
                     if (step === BuildStep.EmitBuildInfo) {
@@ -116937,6 +116922,7 @@ var ts;
         }
         function emit(writeFileCallback, cancellationToken, customTransformers) {
             var _a;
+            var _b, _c;
             ts.Debug.assertIsDefined(program);
             ts.Debug.assert(step === BuildStep.Emit);
             // Before emitting lets backup state, so we can revert it back if there are declaration errors to handle emit and declaration errors correctly
@@ -116947,7 +116933,7 @@ var ts;
             var emitResult = ts.emitFilesAndReportErrors(program, reportDeclarationDiagnostics, 
             /*write*/ undefined, 
             /*reportSummary*/ undefined, function (name, text, writeByteOrderMark) { return outputFiles.push({ name: name, text: text, writeByteOrderMark: writeByteOrderMark }); }, cancellationToken, 
-            /*emitOnlyDts*/ false, customTransformers).emitResult;
+            /*emitOnlyDts*/ false, customTransformers || ((_c = (_b = state.host).getCustomTransformers) === null || _c === void 0 ? void 0 : _c.call(_b, project))).emitResult;
             // Don't emit .d.ts if there are decl file errors
             if (declDiagnostics) {
                 program.restoreState();
@@ -117029,6 +117015,7 @@ var ts;
             return emitDiagnostics;
         }
         function emitBundle(writeFileCallback, customTransformers) {
+            var _a, _b;
             ts.Debug.assert(kind === InvalidatedProjectKind.UpdateBundle);
             if (state.options.dry) {
                 reportStatus(state, ts.Diagnostics.A_non_dry_build_would_update_output_of_project_0, project);
@@ -117044,7 +117031,7 @@ var ts;
             var outputFiles = ts.emitUsingBuildInfo(config, compilerHost, function (ref) {
                 var refName = resolveProjectName(state, ref.path);
                 return parseConfigFile(state, refName, toResolvedConfigFilePath(state, refName));
-            }, customTransformers);
+            }, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project)));
             if (ts.isString(outputFiles)) {
                 reportStatus(state, ts.Diagnostics.Cannot_update_output_of_project_0_because_there_was_error_reading_file_1, project, relName(state, outputFiles));
                 step = BuildStep.BuildInvalidatedProjectOfBundle;
@@ -121312,9 +121299,7 @@ var ts;
             [8 /* OptionalDependencies */, info.optionalDependencies],
             [4 /* PeerDependencies */, info.peerDependencies],
         ];
-        return __assign(__assign({}, info), { parseable: !!content, fileName: fileName,
-            get: get,
-            has: function (dependencyName, inGroups) {
+        return __assign(__assign({}, info), { parseable: !!content, fileName: fileName, get: get, has: function (dependencyName, inGroups) {
                 return !!get(dependencyName, inGroups);
             } });
         function get(dependencyName, inGroups) {
@@ -127740,9 +127725,7 @@ var ts;
                         var name_1 = displayParts_1.map(function (p) { return p.text; }).join("");
                         var declaration = symbol.declarations && ts.firstOrUndefined(symbol.declarations);
                         var node = declaration ? (ts.getNameOfDeclaration(declaration) || declaration) : originalNode;
-                        return __assign(__assign({}, getFileAndTextSpanFromNode(node)), { name: name_1,
-                            kind: kind_1,
-                            displayParts: displayParts_1, context: getContextNode(declaration) });
+                        return __assign(__assign({}, getFileAndTextSpanFromNode(node)), { name: name_1, kind: kind_1, displayParts: displayParts_1, context: getContextNode(declaration) });
                     }
                     case 1 /* Label */: {
                         var node = def.node;
@@ -127777,10 +127760,7 @@ var ts;
                 }
             })();
             var sourceFile = info.sourceFile, textSpan = info.textSpan, name = info.name, kind = info.kind, displayParts = info.displayParts, context = info.context;
-            return __assign({ containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind,
-                name: name,
-                textSpan: textSpan,
-                displayParts: displayParts }, toContextSpan(textSpan, sourceFile, context));
+            return __assign({ containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind, name: name, textSpan: textSpan, displayParts: displayParts }, toContextSpan(textSpan, sourceFile, context));
         }
         function getFileAndTextSpanFromNode(node) {
             var sourceFile = node.getSourceFile();
diff --git a/lib/typescriptServices.d.ts b/lib/typescriptServices.d.ts
index 2d44d601a4731..af981316e9455 100644
--- a/lib/typescriptServices.d.ts
+++ b/lib/typescriptServices.d.ts
@@ -5205,6 +5205,7 @@ declare namespace ts {
          * writeFileCallback
          */
         writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        getCustomTransformers?: (project: string) => CustomTransformers | undefined;
         getModifiedTime(fileName: string): Date | undefined;
         setModifiedTime(fileName: string, date: Date): void;
         deleteFile(fileName: string): void;
diff --git a/lib/typescriptServices.js b/lib/typescriptServices.js
index 78539cc744019..cf1c925cc6e5e 100644
--- a/lib/typescriptServices.js
+++ b/lib/typescriptServices.js
@@ -290,7 +290,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.3.3";
+    ts.version = "4.3.4";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -17515,56 +17515,43 @@ var ts;
         }
         return __assign(__assign({}, writer), { writeTrailingSemicolon: function () {
                 pendingTrailingSemicolon = true;
-            },
-            writeLiteral: function (s) {
+            }, writeLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeLiteral(s);
-            },
-            writeStringLiteral: function (s) {
+            }, writeStringLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeStringLiteral(s);
-            },
-            writeSymbol: function (s, sym) {
+            }, writeSymbol: function (s, sym) {
                 commitPendingTrailingSemicolon();
                 writer.writeSymbol(s, sym);
-            },
-            writePunctuation: function (s) {
+            }, writePunctuation: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writePunctuation(s);
-            },
-            writeKeyword: function (s) {
+            }, writeKeyword: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeKeyword(s);
-            },
-            writeOperator: function (s) {
+            }, writeOperator: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeOperator(s);
-            },
-            writeParameter: function (s) {
+            }, writeParameter: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeParameter(s);
-            },
-            writeSpace: function (s) {
+            }, writeSpace: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeSpace(s);
-            },
-            writeProperty: function (s) {
+            }, writeProperty: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeProperty(s);
-            },
-            writeComment: function (s) {
+            }, writeComment: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeComment(s);
-            },
-            writeLine: function () {
+            }, writeLine: function () {
                 commitPendingTrailingSemicolon();
                 writer.writeLine();
-            },
-            increaseIndent: function () {
+            }, increaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.increaseIndent();
-            },
-            decreaseIndent: function () {
+            }, decreaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.decreaseIndent();
             } });
@@ -40499,9 +40486,7 @@ var ts;
         var preDirectoryResolutionCache = createPerDirectoryResolutionCache(currentDirectory, getCanonicalFileName, directoryToModuleNameMap || (directoryToModuleNameMap = createCacheWithRedirects(options)));
         moduleNameToDirectoryMap || (moduleNameToDirectoryMap = createCacheWithRedirects(options));
         var packageJsonInfoCache = createPackageJsonInfoCache(currentDirectory, getCanonicalFileName);
-        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName,
-            clear: clear,
-            update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
+        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName, clear: clear, update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
         function clear() {
             preDirectoryResolutionCache.clear();
             moduleNameToDirectoryMap.clear();
@@ -116852,7 +116837,7 @@ var ts;
                 },
                 emit: function (targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
                     if (targetSourceFile || emitOnlyDtsFiles) {
-                        return withProgramOrUndefined(function (program) { return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers); });
+                        return withProgramOrUndefined(function (program) { var _a, _b; return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project))); });
                     }
                     executeSteps(BuildStep.SemanticDiagnostics, cancellationToken);
                     if (step === BuildStep.EmitBuildInfo) {
@@ -116937,6 +116922,7 @@ var ts;
         }
         function emit(writeFileCallback, cancellationToken, customTransformers) {
             var _a;
+            var _b, _c;
             ts.Debug.assertIsDefined(program);
             ts.Debug.assert(step === BuildStep.Emit);
             // Before emitting lets backup state, so we can revert it back if there are declaration errors to handle emit and declaration errors correctly
@@ -116947,7 +116933,7 @@ var ts;
             var emitResult = ts.emitFilesAndReportErrors(program, reportDeclarationDiagnostics, 
             /*write*/ undefined, 
             /*reportSummary*/ undefined, function (name, text, writeByteOrderMark) { return outputFiles.push({ name: name, text: text, writeByteOrderMark: writeByteOrderMark }); }, cancellationToken, 
-            /*emitOnlyDts*/ false, customTransformers).emitResult;
+            /*emitOnlyDts*/ false, customTransformers || ((_c = (_b = state.host).getCustomTransformers) === null || _c === void 0 ? void 0 : _c.call(_b, project))).emitResult;
             // Don't emit .d.ts if there are decl file errors
             if (declDiagnostics) {
                 program.restoreState();
@@ -117029,6 +117015,7 @@ var ts;
             return emitDiagnostics;
         }
         function emitBundle(writeFileCallback, customTransformers) {
+            var _a, _b;
             ts.Debug.assert(kind === InvalidatedProjectKind.UpdateBundle);
             if (state.options.dry) {
                 reportStatus(state, ts.Diagnostics.A_non_dry_build_would_update_output_of_project_0, project);
@@ -117044,7 +117031,7 @@ var ts;
             var outputFiles = ts.emitUsingBuildInfo(config, compilerHost, function (ref) {
                 var refName = resolveProjectName(state, ref.path);
                 return parseConfigFile(state, refName, toResolvedConfigFilePath(state, refName));
-            }, customTransformers);
+            }, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project)));
             if (ts.isString(outputFiles)) {
                 reportStatus(state, ts.Diagnostics.Cannot_update_output_of_project_0_because_there_was_error_reading_file_1, project, relName(state, outputFiles));
                 step = BuildStep.BuildInvalidatedProjectOfBundle;
@@ -121312,9 +121299,7 @@ var ts;
             [8 /* OptionalDependencies */, info.optionalDependencies],
             [4 /* PeerDependencies */, info.peerDependencies],
         ];
-        return __assign(__assign({}, info), { parseable: !!content, fileName: fileName,
-            get: get,
-            has: function (dependencyName, inGroups) {
+        return __assign(__assign({}, info), { parseable: !!content, fileName: fileName, get: get, has: function (dependencyName, inGroups) {
                 return !!get(dependencyName, inGroups);
             } });
         function get(dependencyName, inGroups) {
@@ -127740,9 +127725,7 @@ var ts;
                         var name_1 = displayParts_1.map(function (p) { return p.text; }).join("");
                         var declaration = symbol.declarations && ts.firstOrUndefined(symbol.declarations);
                         var node = declaration ? (ts.getNameOfDeclaration(declaration) || declaration) : originalNode;
-                        return __assign(__assign({}, getFileAndTextSpanFromNode(node)), { name: name_1,
-                            kind: kind_1,
-                            displayParts: displayParts_1, context: getContextNode(declaration) });
+                        return __assign(__assign({}, getFileAndTextSpanFromNode(node)), { name: name_1, kind: kind_1, displayParts: displayParts_1, context: getContextNode(declaration) });
                     }
                     case 1 /* Label */: {
                         var node = def.node;
@@ -127777,10 +127760,7 @@ var ts;
                 }
             })();
             var sourceFile = info.sourceFile, textSpan = info.textSpan, name = info.name, kind = info.kind, displayParts = info.displayParts, context = info.context;
-            return __assign({ containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind,
-                name: name,
-                textSpan: textSpan,
-                displayParts: displayParts }, toContextSpan(textSpan, sourceFile, context));
+            return __assign({ containerKind: "" /* unknown */, containerName: "", fileName: sourceFile.fileName, kind: kind, name: name, textSpan: textSpan, displayParts: displayParts }, toContextSpan(textSpan, sourceFile, context));
         }
         function getFileAndTextSpanFromNode(node) {
             var sourceFile = node.getSourceFile();
diff --git a/lib/typingsInstaller.js b/lib/typingsInstaller.js
index 859392ce380af..5aa1daffbbe5c 100644
--- a/lib/typingsInstaller.js
+++ b/lib/typingsInstaller.js
@@ -85,7 +85,7 @@ var ts;
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    ts.version = "4.3.3";
+    ts.version = "4.3.4";
     /* @internal */
     var Comparison;
     (function (Comparison) {
@@ -17310,56 +17310,43 @@ var ts;
         }
         return __assign(__assign({}, writer), { writeTrailingSemicolon: function () {
                 pendingTrailingSemicolon = true;
-            },
-            writeLiteral: function (s) {
+            }, writeLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeLiteral(s);
-            },
-            writeStringLiteral: function (s) {
+            }, writeStringLiteral: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeStringLiteral(s);
-            },
-            writeSymbol: function (s, sym) {
+            }, writeSymbol: function (s, sym) {
                 commitPendingTrailingSemicolon();
                 writer.writeSymbol(s, sym);
-            },
-            writePunctuation: function (s) {
+            }, writePunctuation: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writePunctuation(s);
-            },
-            writeKeyword: function (s) {
+            }, writeKeyword: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeKeyword(s);
-            },
-            writeOperator: function (s) {
+            }, writeOperator: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeOperator(s);
-            },
-            writeParameter: function (s) {
+            }, writeParameter: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeParameter(s);
-            },
-            writeSpace: function (s) {
+            }, writeSpace: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeSpace(s);
-            },
-            writeProperty: function (s) {
+            }, writeProperty: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeProperty(s);
-            },
-            writeComment: function (s) {
+            }, writeComment: function (s) {
                 commitPendingTrailingSemicolon();
                 writer.writeComment(s);
-            },
-            writeLine: function () {
+            }, writeLine: function () {
                 commitPendingTrailingSemicolon();
                 writer.writeLine();
-            },
-            increaseIndent: function () {
+            }, increaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.increaseIndent();
-            },
-            decreaseIndent: function () {
+            }, decreaseIndent: function () {
                 commitPendingTrailingSemicolon();
                 writer.decreaseIndent();
             } });
@@ -40294,9 +40281,7 @@ var ts;
         var preDirectoryResolutionCache = createPerDirectoryResolutionCache(currentDirectory, getCanonicalFileName, directoryToModuleNameMap || (directoryToModuleNameMap = createCacheWithRedirects(options)));
         moduleNameToDirectoryMap || (moduleNameToDirectoryMap = createCacheWithRedirects(options));
         var packageJsonInfoCache = createPackageJsonInfoCache(currentDirectory, getCanonicalFileName);
-        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName,
-            clear: clear,
-            update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
+        return __assign(__assign(__assign({}, packageJsonInfoCache), preDirectoryResolutionCache), { getOrCreateCacheForModuleName: getOrCreateCacheForModuleName, clear: clear, update: update, getPackageJsonInfoCache: function () { return packageJsonInfoCache; } });
         function clear() {
             preDirectoryResolutionCache.clear();
             moduleNameToDirectoryMap.clear();
@@ -116647,7 +116632,7 @@ var ts;
                 },
                 emit: function (targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) {
                     if (targetSourceFile || emitOnlyDtsFiles) {
-                        return withProgramOrUndefined(function (program) { return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers); });
+                        return withProgramOrUndefined(function (program) { var _a, _b; return program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project))); });
                     }
                     executeSteps(BuildStep.SemanticDiagnostics, cancellationToken);
                     if (step === BuildStep.EmitBuildInfo) {
@@ -116732,6 +116717,7 @@ var ts;
         }
         function emit(writeFileCallback, cancellationToken, customTransformers) {
             var _a;
+            var _b, _c;
             ts.Debug.assertIsDefined(program);
             ts.Debug.assert(step === BuildStep.Emit);
             // Before emitting lets backup state, so we can revert it back if there are declaration errors to handle emit and declaration errors correctly
@@ -116742,7 +116728,7 @@ var ts;
             var emitResult = ts.emitFilesAndReportErrors(program, reportDeclarationDiagnostics, 
             /*write*/ undefined, 
             /*reportSummary*/ undefined, function (name, text, writeByteOrderMark) { return outputFiles.push({ name: name, text: text, writeByteOrderMark: writeByteOrderMark }); }, cancellationToken, 
-            /*emitOnlyDts*/ false, customTransformers).emitResult;
+            /*emitOnlyDts*/ false, customTransformers || ((_c = (_b = state.host).getCustomTransformers) === null || _c === void 0 ? void 0 : _c.call(_b, project))).emitResult;
             // Don't emit .d.ts if there are decl file errors
             if (declDiagnostics) {
                 program.restoreState();
@@ -116824,6 +116810,7 @@ var ts;
             return emitDiagnostics;
         }
         function emitBundle(writeFileCallback, customTransformers) {
+            var _a, _b;
             ts.Debug.assert(kind === InvalidatedProjectKind.UpdateBundle);
             if (state.options.dry) {
                 reportStatus(state, ts.Diagnostics.A_non_dry_build_would_update_output_of_project_0, project);
@@ -116839,7 +116826,7 @@ var ts;
             var outputFiles = ts.emitUsingBuildInfo(config, compilerHost, function (ref) {
                 var refName = resolveProjectName(state, ref.path);
                 return parseConfigFile(state, refName, toResolvedConfigFilePath(state, refName));
-            }, customTransformers);
+            }, customTransformers || ((_b = (_a = state.host).getCustomTransformers) === null || _b === void 0 ? void 0 : _b.call(_a, project)));
             if (ts.isString(outputFiles)) {
                 reportStatus(state, ts.Diagnostics.Cannot_update_output_of_project_0_because_there_was_error_reading_file_1, project, relName(state, outputFiles));
                 step = BuildStep.BuildInvalidatedProjectOfBundle;
diff --git a/package.json b/package.json
index 0f515e9766e5d..a5eeae7d13e0b 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "typescript",
     "author": "Microsoft Corp.",
     "homepage": "https://www.typescriptlang.org/",
-    "version": "4.3.3",
+    "version": "4.3.4",
     "license": "Apache-2.0",
     "description": "TypeScript is a language for application scale JavaScript development",
     "keywords": [
diff --git a/src/compiler/corePublic.ts b/src/compiler/corePublic.ts
index 8d3e8d5c8a4d7..ed8388e45b195 100644
--- a/src/compiler/corePublic.ts
+++ b/src/compiler/corePublic.ts
@@ -5,7 +5,7 @@ namespace ts {
     // The following is baselined as a literal template type without intervention
     /** The version of the TypeScript compiler release */
     // eslint-disable-next-line @typescript-eslint/no-inferrable-types
-    export const version = "4.3.3" as string;
+    export const version = "4.3.4" as string;
 
     /**
      * Type of objects whose values are all of the same type.
diff --git a/src/compiler/tsbuildPublic.ts b/src/compiler/tsbuildPublic.ts
index ec2097dd9552d..bef0831691493 100644
--- a/src/compiler/tsbuildPublic.ts
+++ b/src/compiler/tsbuildPublic.ts
@@ -85,6 +85,7 @@ namespace ts {
          * writeFileCallback
          */
         writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        getCustomTransformers?: (project: string) => CustomTransformers | undefined;
 
         getModifiedTime(fileName: string): Date | undefined;
         setModifiedTime(fileName: string, date: Date): void;
@@ -785,7 +786,7 @@ namespace ts {
                 emit: (targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers) => {
                     if (targetSourceFile || emitOnlyDtsFiles) {
                         return withProgramOrUndefined(
-                            program => program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers)
+                            program => program.emit(targetSourceFile, writeFile, cancellationToken, emitOnlyDtsFiles, customTransformers || state.host.getCustomTransformers?.(project))
                         );
                     }
                     executeSteps(BuildStep.SemanticDiagnostics, cancellationToken);
@@ -921,7 +922,7 @@ namespace ts {
                 (name, text, writeByteOrderMark) => outputFiles.push({ name, text, writeByteOrderMark }),
                 cancellationToken,
                 /*emitOnlyDts*/ false,
-                customTransformers
+                customTransformers || state.host.getCustomTransformers?.(project)
             );
             // Don't emit .d.ts if there are decl file errors
             if (declDiagnostics) {
@@ -1060,7 +1061,7 @@ namespace ts {
                     const refName = resolveProjectName(state, ref.path);
                     return parseConfigFile(state, refName, toResolvedConfigFilePath(state, refName));
                 },
-                customTransformers
+                customTransformers || state.host.getCustomTransformers?.(project)
             );
 
             if (isString(outputFiles)) {
diff --git a/src/testRunner/tsconfig.json b/src/testRunner/tsconfig.json
index 439b447d6396f..cc52d75d36bce 100644
--- a/src/testRunner/tsconfig.json
+++ b/src/testRunner/tsconfig.json
@@ -137,6 +137,7 @@
         "unittests/tsbuild/transitiveReferences.ts",
         "unittests/tsbuild/watchEnvironment.ts",
         "unittests/tsbuild/watchMode.ts",
+        "unittests/tsbuildWatch/publicApi.ts",
         "unittests/tsc/composite.ts",
         "unittests/tsc/declarationEmit.ts",
         "unittests/tsc/incremental.ts",
diff --git a/src/testRunner/unittests/tsbuildWatch/publicApi.ts b/src/testRunner/unittests/tsbuildWatch/publicApi.ts
new file mode 100644
index 0000000000000..bca1472e0d893
--- /dev/null
+++ b/src/testRunner/unittests/tsbuildWatch/publicApi.ts
@@ -0,0 +1,115 @@
+namespace ts.tscWatch {
+    it("unittests:: tsbuildWatch:: watchMode:: Public API with custom transformers", () => {
+        const solution: File = {
+            path: `${projectRoot}/tsconfig.json`,
+            content: JSON.stringify({
+                references: [
+                    { path: "./shared/tsconfig.json" },
+                    { path: "./webpack/tsconfig.json" }
+                ],
+                files: []
+            })
+        };
+        const sharedConfig: File = {
+            path: `${projectRoot}/shared/tsconfig.json`,
+            content: JSON.stringify({
+                compilerOptions: { composite: true },
+            })
+        };
+        const sharedIndex: File = {
+            path: `${projectRoot}/shared/index.ts`,
+            content: `export function f1() { }
+export class c { }
+export enum e { }
+// leading
+export function f2() { } // trailing`
+        };
+        const webpackConfig: File = {
+            path: `${projectRoot}/webpack/tsconfig.json`,
+            content: JSON.stringify({
+                compilerOptions: { composite: true, },
+                references: [{ path: "../shared/tsconfig.json" }]
+            })
+        };
+        const webpackIndex: File = {
+            path: `${projectRoot}/webpack/index.ts`,
+            content: `export function f2() { }
+export class c2 { }
+export enum e2 { }
+// leading
+export function f22() { } // trailing`
+        };
+        const commandLineArgs = ["--b", "--w"];
+        const { sys, baseline, oldSnap } = createBaseline(createWatchedSystem([libFile, solution, sharedConfig, sharedIndex, webpackConfig, webpackIndex], { currentDirectory: projectRoot }));
+        const { cb, getPrograms } = commandLineCallbacks(sys);
+        const buildHost = createSolutionBuilderWithWatchHost(
+            sys,
+            /*createProgram*/ undefined,
+            createDiagnosticReporter(sys, /*pretty*/ true),
+            createBuilderStatusReporter(sys, /*pretty*/ true),
+            createWatchStatusReporter(sys, /*pretty*/ true)
+        );
+        buildHost.afterProgramEmitAndDiagnostics = cb;
+        buildHost.afterEmitBundle = cb;
+        buildHost.getCustomTransformers = getCustomTransformers;
+        const builder = createSolutionBuilderWithWatch(buildHost, [solution.path], { verbose: true });
+        builder.build();
+        runWatchBaseline({
+            scenario: "publicApi",
+            subScenario: "with custom transformers",
+            commandLineArgs,
+            sys,
+            baseline,
+            oldSnap,
+            getPrograms,
+            changes: [
+                {
+                    caption: "change to shared",
+                    change: sys => sys.prependFile(sharedIndex.path, "export function fooBar() {}"),
+                    timeouts: sys => {
+                        sys.checkTimeoutQueueLengthAndRun(1); // Shared
+                        sys.checkTimeoutQueueLengthAndRun(1); // webpack
+                        sys.checkTimeoutQueueLengthAndRun(1); // solution
+                        sys.checkTimeoutQueueLength(0);
+                    }
+                }
+            ],
+            watchOrSolution: builder
+        });
+
+        function getCustomTransformers(project: string): CustomTransformers {
+            const before: TransformerFactory<SourceFile> = context => {
+                return file => visitEachChild(file, visit, context);
+                function visit(node: Node): VisitResult<Node> {
+                    switch (node.kind) {
+                        case SyntaxKind.FunctionDeclaration:
+                            return visitFunction(node as FunctionDeclaration);
+                        default:
+                            return visitEachChild(node, visit, context);
+                    }
+                }
+                function visitFunction(node: FunctionDeclaration) {
+                    addSyntheticLeadingComment(node, SyntaxKind.MultiLineCommentTrivia, `@before${project}`, /*hasTrailingNewLine*/ true);
+                    return node;
+                }
+            };
+
+            const after: TransformerFactory<SourceFile> = context => {
+                return file => visitEachChild(file, visit, context);
+                function visit(node: Node): VisitResult<Node> {
+                    switch (node.kind) {
+                        case SyntaxKind.VariableStatement:
+                            return visitVariableStatement(node as VariableStatement);
+                        default:
+                            return visitEachChild(node, visit, context);
+                    }
+                }
+                function visitVariableStatement(node: VariableStatement) {
+                    addSyntheticLeadingComment(node, SyntaxKind.SingleLineCommentTrivia, `@after${project}`);
+                    return node;
+                }
+            };
+            return { before: [before], after: [after] };
+        }
+    });
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 6195d669a8306..d6750c44d0a2e 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -5205,6 +5205,7 @@ declare namespace ts {
          * writeFileCallback
          */
         writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        getCustomTransformers?: (project: string) => CustomTransformers | undefined;
         getModifiedTime(fileName: string): Date | undefined;
         setModifiedTime(fileName: string, date: Date): void;
         deleteFile(fileName: string): void;
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index b86a3a29970a4..0cae15013d02c 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -5205,6 +5205,7 @@ declare namespace ts {
          * writeFileCallback
          */
         writeFile?(path: string, data: string, writeByteOrderMark?: boolean): void;
+        getCustomTransformers?: (project: string) => CustomTransformers | undefined;
         getModifiedTime(fileName: string): Date | undefined;
         setModifiedTime(fileName: string, date: Date): void;
         deleteFile(fileName: string): void;
diff --git a/tests/baselines/reference/tsbuild/watchMode/publicApi/with-custom-transformers.js b/tests/baselines/reference/tsbuild/watchMode/publicApi/with-custom-transformers.js
new file mode 100644
index 0000000000000..cb6cf6f589af1
--- /dev/null
+++ b/tests/baselines/reference/tsbuild/watchMode/publicApi/with-custom-transformers.js
@@ -0,0 +1,383 @@
+Input::
+//// [/a/lib/lib.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+
+//// [/user/username/projects/myproject/tsconfig.json]
+{"references":[{"path":"./shared/tsconfig.json"},{"path":"./webpack/tsconfig.json"}],"files":[]}
+
+//// [/user/username/projects/myproject/shared/tsconfig.json]
+{"compilerOptions":{"composite":true}}
+
+//// [/user/username/projects/myproject/shared/index.ts]
+export function f1() { }
+export class c { }
+export enum e { }
+// leading
+export function f2() { } // trailing
+
+//// [/user/username/projects/myproject/webpack/tsconfig.json]
+{"compilerOptions":{"composite":true},"references":[{"path":"../shared/tsconfig.json"}]}
+
+//// [/user/username/projects/myproject/webpack/index.ts]
+export function f2() { }
+export class c2 { }
+export enum e2 { }
+// leading
+export function f22() { } // trailing
+
+
+/a/lib/tsc.js --b --w
+Output::
+[12:00:31 AM] Projects in this build: 
+    * shared/tsconfig.json
+    * webpack/tsconfig.json
+    * tsconfig.json
+
+[12:00:32 AM] Project 'shared/tsconfig.json' is out of date because output file 'shared/index.js' does not exist
+
+[12:00:33 AM] Building project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+[12:00:42 AM] Project 'webpack/tsconfig.json' is out of date because output file 'webpack/index.js' does not exist
+
+[12:00:43 AM] Building project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:00:52 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/shared/index.ts"]
+Program options: {"composite":true,"configFilePath":"/user/username/projects/myproject/shared/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Program root files: ["/user/username/projects/myproject/webpack/index.ts"]
+Program options: {"composite":true,"configFilePath":"/user/username/projects/myproject/webpack/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/webpack/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/webpack/index.ts
+
+WatchedFiles::
+/user/username/projects/myproject/shared/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/shared/index.ts:
+  {"fileName":"/user/username/projects/myproject/shared/index.ts","pollingInterval":250}
+/user/username/projects/myproject/webpack/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/webpack/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/index.ts:
+  {"fileName":"/user/username/projects/myproject/webpack/index.ts","pollingInterval":250}
+/user/username/projects/myproject/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/tsconfig.json","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/shared:
+  {"directoryName":"/user/username/projects/myproject/shared","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/webpack:
+  {"directoryName":"/user/username/projects/myproject/webpack","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/shared/index.js]
+"use strict";
+exports.__esModule = true;
+exports.f2 = exports.e = exports.c = exports.f1 = void 0;
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+function f1() { }
+exports.f1 = f1;
+//@after/user/username/projects/myproject/shared/tsconfig.json
+var c = /** @class */ (function () {
+    function c() {
+    }
+    return c;
+}());
+exports.c = c;
+//@after/user/username/projects/myproject/shared/tsconfig.json
+var e;
+(function (e) {
+})(e = exports.e || (exports.e = {}));
+// leading
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+function f2() { } // trailing
+exports.f2 = f2;
+
+
+//// [/user/username/projects/myproject/shared/index.d.ts]
+export declare function f1(): void;
+export declare class c {
+}
+export declare enum e {
+}
+export declare function f2(): void;
+
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},"8649344783-export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing"],"options":{"composite":true},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true
+      },
+      "./index.ts": {
+        "version": "8649344783-export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing",
+        "signature": "8649344783-export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing"
+      }
+    },
+    "options": {
+      "composite": true
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 745
+}
+
+//// [/user/username/projects/myproject/webpack/index.js]
+"use strict";
+exports.__esModule = true;
+exports.f22 = exports.e2 = exports.c2 = exports.f2 = void 0;
+/*@before/user/username/projects/myproject/webpack/tsconfig.json*/
+function f2() { }
+exports.f2 = f2;
+//@after/user/username/projects/myproject/webpack/tsconfig.json
+var c2 = /** @class */ (function () {
+    function c2() {
+    }
+    return c2;
+}());
+exports.c2 = c2;
+//@after/user/username/projects/myproject/webpack/tsconfig.json
+var e2;
+(function (e2) {
+})(e2 = exports.e2 || (exports.e2 = {}));
+// leading
+/*@before/user/username/projects/myproject/webpack/tsconfig.json*/
+function f22() { } // trailing
+exports.f22 = f22;
+
+
+//// [/user/username/projects/myproject/webpack/index.d.ts]
+export declare function f2(): void;
+export declare class c2 {
+}
+export declare enum e2 {
+}
+export declare function f22(): void;
+
+
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},"20140662566-export function f2() { }\nexport class c2 { }\nexport enum e2 { }\n// leading\nexport function f22() { } // trailing"],"options":{"composite":true},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true
+      },
+      "./index.ts": {
+        "version": "20140662566-export function f2() { }\nexport class c2 { }\nexport enum e2 { }\n// leading\nexport function f22() { } // trailing",
+        "signature": "20140662566-export function f2() { }\nexport class c2 { }\nexport enum e2 { }\n// leading\nexport function f22() { } // trailing"
+      }
+    },
+    "options": {
+      "composite": true
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 749
+}
+
+
+Change:: change to shared
+
+Input::
+//// [/user/username/projects/myproject/shared/index.ts]
+export function fooBar() {}export function f1() { }
+export class c { }
+export enum e { }
+// leading
+export function f2() { } // trailing
+
+
+Output::
+>> Screen clear
+[12:00:55 AM] File change detected. Starting incremental compilation...
+
+[12:00:56 AM] Project 'shared/tsconfig.json' is out of date because oldest output 'shared/index.js' is older than newest input 'shared/index.ts'
+
+[12:00:57 AM] Building project '/user/username/projects/myproject/shared/tsconfig.json'...
+
+[12:01:10 AM] Project 'webpack/tsconfig.json' is out of date because oldest output 'webpack/index.js' is older than newest input 'shared/tsconfig.json'
+
+[12:01:11 AM] Building project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:01:13 AM] Updating unchanged output timestamps of project '/user/username/projects/myproject/webpack/tsconfig.json'...
+
+[12:01:14 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/shared/index.ts"]
+Program options: {"composite":true,"configFilePath":"/user/username/projects/myproject/shared/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/shared/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/shared/index.ts
+
+Program root files: ["/user/username/projects/myproject/webpack/index.ts"]
+Program options: {"composite":true,"configFilePath":"/user/username/projects/myproject/webpack/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.d.ts
+/user/username/projects/myproject/webpack/index.ts
+
+Semantic diagnostics in builder refreshed for::
+
+WatchedFiles::
+/user/username/projects/myproject/shared/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/shared/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/shared/index.ts:
+  {"fileName":"/user/username/projects/myproject/shared/index.ts","pollingInterval":250}
+/user/username/projects/myproject/webpack/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/webpack/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/webpack/index.ts:
+  {"fileName":"/user/username/projects/myproject/webpack/index.ts","pollingInterval":250}
+/user/username/projects/myproject/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/tsconfig.json","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/shared:
+  {"directoryName":"/user/username/projects/myproject/shared","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/webpack:
+  {"directoryName":"/user/username/projects/myproject/webpack","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/shared/index.js]
+"use strict";
+exports.__esModule = true;
+exports.f2 = exports.e = exports.c = exports.f1 = exports.fooBar = void 0;
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+function fooBar() { }
+exports.fooBar = fooBar;
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+function f1() { }
+exports.f1 = f1;
+//@after/user/username/projects/myproject/shared/tsconfig.json
+var c = /** @class */ (function () {
+    function c() {
+    }
+    return c;
+}());
+exports.c = c;
+//@after/user/username/projects/myproject/shared/tsconfig.json
+var e;
+(function (e) {
+})(e = exports.e || (exports.e = {}));
+// leading
+/*@before/user/username/projects/myproject/shared/tsconfig.json*/
+function f2() { } // trailing
+exports.f2 = f2;
+
+
+//// [/user/username/projects/myproject/shared/index.d.ts]
+export declare function fooBar(): void;
+export declare function f1(): void;
+export declare class c {
+}
+export declare enum e {
+}
+export declare function f2(): void;
+
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../a/lib/lib.d.ts","./index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},{"version":"14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing","signature":"1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n"}],"options":{"composite":true},"referencedMap":[],"exportedModulesMap":[],"semanticDiagnosticsPerFile":[1,2]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/shared/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../a/lib/lib.d.ts",
+      "./index.ts"
+    ],
+    "fileInfos": {
+      "../../../../../a/lib/lib.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true
+      },
+      "./index.ts": {
+        "version": "14127205977-export function fooBar() {}export function f1() { }\nexport class c { }\nexport enum e { }\n// leading\nexport function f2() { } // trailing",
+        "signature": "1966424426-export declare function fooBar(): void;\nexport declare function f1(): void;\nexport declare class c {\n}\nexport declare enum e {\n}\nexport declare function f2(): void;\n"
+      }
+    },
+    "options": {
+      "composite": true
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../../../../a/lib/lib.d.ts",
+      "./index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 983
+}
+
+//// [/user/username/projects/myproject/webpack/index.js] file changed its modified time
+//// [/user/username/projects/myproject/webpack/index.d.ts] file changed its modified time
+//// [/user/username/projects/myproject/webpack/tsconfig.tsbuildinfo] file changed its modified time