diff --git a/build/lib/asar.ts b/build/lib/asar.ts
index 186cdf093a4b3d83d9c8f48c0a7eed1a8f0327df..d2823043aabfc829c6df638a34a610871631e83b 100644
--- a/build/lib/asar.ts
+++ b/build/lib/asar.ts
@@ -64,7 +64,7 @@ export function createAsar(folderPath: string, unpackGlobs: string[], destFilena
 		filesystem.insertFile(relativePath, shouldUnpack, { stat: stat }, {}, onFileInserted);
 	};
 
-	return es.through(function (this: any, file) {
+	return es.through(function (file) {
 		if (file.stat.isDirectory()) {
 			return;
 		}
@@ -88,7 +88,7 @@ export function createAsar(folderPath: string, unpackGlobs: string[], destFilena
 			// The file goes inside of xx.asar
 			out.push(file.contents);
 		}
-	}, function (this: any) {
+	}, function () {
 
 		let finish = () => {
 			{
diff --git a/build/lib/compilation.ts b/build/lib/compilation.ts
index eac4e226d5e169258430b863bc5e54f30fbdd5c4..27bce9ff38c6b748108c5606b963328b77f95b5b 100644
--- a/build/lib/compilation.ts
+++ b/build/lib/compilation.ts
@@ -175,7 +175,7 @@ function monacodtsTask(out: string, isWatch: boolean): NodeJS.ReadWriteStream {
 		}));
 	}
 
-	resultStream = es.through(function (this: any, data) {
+	resultStream = es.through(function (data) {
 		const filePath = path.normalize(path.resolve(basePath, data.relative));
 		if (neededFiles[filePath]) {
 			setInputFile(filePath, data.contents.toString());
diff --git a/build/lib/extensions.js b/build/lib/extensions.js
index b8f48515b29ddb05395b7c70248f52ea872ac98f..071fb5258c2887cf7e187b8c9144b9664d1794ee 100644
--- a/build/lib/extensions.js
+++ b/build/lib/extensions.js
@@ -150,11 +150,6 @@ function fromLocalNormal(extensionPath) {
         .catch(function (err) { return result.emit('error', err); });
     return result.pipe(stats_1.createStatsStream(path.basename(extensionPath)));
 }
-function error(err) {
-    var result = es.through();
-    setTimeout(function () { return result.emit('error', err); });
-    return result;
-}
 var baseHeaders = {
     'X-Market-Client-Id': 'VSCode Build',
     'User-Agent': 'VSCode Build',
diff --git a/build/lib/extensions.ts b/build/lib/extensions.ts
index a04c9ff27dc9545706bf9240be871420e3868f49..18020bb63ad7c7f54239f642561c4520d005b319 100644
--- a/build/lib/extensions.ts
+++ b/build/lib/extensions.ts
@@ -110,12 +110,12 @@ function fromLocalWebpack(extensionPath: string, sourceMappingURLBase: string |
 			let relativeOutputPath = path.relative(extensionPath, webpackConfig.output.path);
 
 			return webpackGulp(webpackConfig, webpack, webpackDone)
-				.pipe(es.through(function (this: any, data) {
+				.pipe(es.through(function (data) {
 					data.stat = data.stat || {};
 					data.base = extensionPath;
 					this.emit('data', data);
 				}))
-				.pipe(es.through(function (this: any, data: File) {
+				.pipe(es.through(function (data: File) {
 					// source map handling:
 					// * rewrite sourceMappingURL
 					// * save to disk so that upload-task picks this up
diff --git a/build/lib/i18n.js b/build/lib/i18n.js
index 85ae97a697adfc7dbe4db6f48d91cff62082eb67..52b8aa5c051d8c884de3280eef0aa93fb98e40e0 100644
--- a/build/lib/i18n.js
+++ b/build/lib/i18n.js
@@ -79,20 +79,9 @@ var PackageJsonFormat;
     }
     PackageJsonFormat.is = is;
 })(PackageJsonFormat || (PackageJsonFormat = {}));
-var ModuleJsonFormat;
-(function (ModuleJsonFormat) {
-    function is(value) {
-        var candidate = value;
-        return Is.defined(candidate)
-            && Is.array(candidate.messages) && candidate.messages.every(function (message) { return Is.string(message); })
-            && Is.array(candidate.keys) && candidate.keys.every(function (key) { return Is.string(key) || LocalizeInfo.is(key); });
-    }
-    ModuleJsonFormat.is = is;
-})(ModuleJsonFormat || (ModuleJsonFormat = {}));
 var Line = /** @class */ (function () {
     function Line(indent) {
         if (indent === void 0) { indent = 0; }
-        this.indent = indent;
         this.buffer = [];
         if (indent > 0) {
             this.buffer.push(new Array(indent + 1).join(' '));
@@ -375,7 +364,6 @@ function processCoreBundleFormat(fileHeader, languages, json, emitter) {
     var messageSection = json.messages;
     var bundleSection = json.bundles;
     var statistics = Object.create(null);
-    var total = 0;
     var defaultMessages = Object.create(null);
     var modules = Object.keys(keysSection);
     modules.forEach(function (module) {
@@ -388,7 +376,6 @@ function processCoreBundleFormat(fileHeader, languages, json, emitter) {
         var messageMap = Object.create(null);
         defaultMessages[module] = messageMap;
         keys.map(function (key, i) {
-            total++;
             if (typeof key === 'string') {
                 messageMap[key] = messages[i];
             }
diff --git a/build/lib/i18n.ts b/build/lib/i18n.ts
index c13a2042fed04b622bc928a8b329f85ee786d5d5..041a5120db41f52b6048d59bc5e7bfffa3b34c7d 100644
--- a/build/lib/i18n.ts
+++ b/build/lib/i18n.ts
@@ -1064,7 +1064,7 @@ function pullXlfFiles(apiHostname: string, username: string, password: string, l
 			called = true;
 			const stream = this;
 			resources.map(function (resource) {
-				retrieveResource(language, resource, apiHostname, credentials).then((file: File) => {
+				retrieveResource(language, resource, apiHostname, credentials).then((file: File | null) => {
 					if (file) {
 						stream.emit('data', file);
 					}
diff --git a/build/lib/typings/event-stream.d.ts b/build/lib/typings/event-stream.d.ts
index a39470c5395d302b231a9c6aa8a4320100a0848c..260051be52e5cd29f0ba2648d6fc8f80d4b92b22 100644
--- a/build/lib/typings/event-stream.d.ts
+++ b/build/lib/typings/event-stream.d.ts
@@ -1,6 +1,6 @@
 declare module "event-stream" {
 	import { Stream } from 'stream';
-	import { ThroughStream as _ThroughStream} from 'through';
+	import { ThroughStream as _ThroughStream } from 'through';
 	import * as File from 'vinyl';
 
 	export interface ThroughStream extends _ThroughStream {
@@ -14,14 +14,14 @@ declare module "event-stream" {
 	function concat(...stream: Stream[]): ThroughStream;
 	function duplex(istream: Stream, ostream: Stream): ThroughStream;
 
-	function through(write?: (data: any) => void, end?: () => void,
-		opts?: {autoDestroy: boolean; }): ThroughStream;
+	function through(write?: (this: ThroughStream, data: any) => void, end?: (this: ThroughStream) => void,
+		opts?: { autoDestroy: boolean; }): ThroughStream;
 
 	function readArray<T>(array: T[]): ThroughStream;
-	function writeArray<T>(cb: (err:Error, array:T[]) => void): ThroughStream;
+	function writeArray<T>(cb: (err: Error, array: T[]) => void): ThroughStream;
 
-	function mapSync<I,O>(cb: (data:I) => O): ThroughStream;
-	function map<I,O>(cb: (data:I, cb:(err?:Error, data?: O)=>void) => O): ThroughStream;
+	function mapSync<I, O>(cb: (data: I) => O): ThroughStream;
+	function map<I, O>(cb: (data: I, cb: (err?: Error, data?: O) => void) => O): ThroughStream;
 
-	function readable(asyncFunction: Function): any;
+	function readable(asyncFunction: (this: ThroughStream, ...args: any[]) => any): any;
 }
\ No newline at end of file