Convert gulp files to ts

For #277526

Had to add a few ugly casts in difficult cases but mostly trying to add proper types

build/lib/optimize.ts

@@ -209,7 +209,7 @@ function bundleESMTask(opts: IBundleESMTaskOpts): NodeJS.ReadWriteStream {
 		}));
 }
 
-export interface IBundleESMTaskOpts {
+export interface IBundleTaskOpts {
 	/**
 	 * Destination folder for the bundled files.
 	 */
@@ -220,7 +220,7 @@ export interface IBundleESMTaskOpts {
 	esm: IBundleESMTaskOpts;
 }
 
-export function bundleTask(opts: IBundleESMTaskOpts): () => NodeJS.ReadWriteStream {
+export function bundleTask(opts: IBundleTaskOpts): () => NodeJS.ReadWriteStream {
 	return function () {
 		return bundleESMTask(opts.esm).pipe(gulp.dest(opts.out));
 	};

build/lib/typings/gulp-gunzip.d.ts

@@ -0,0 +1,15 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'gulp-gunzip' {
+	import type { Transform } from 'stream';
+
+	/**
+	 * Gunzip plugin for gulp
+	 */
+	function gunzip(): Transform;
+
+	export = gunzip;
+}

build/lib/typings/gulp-untar.d.ts

@@ -0,0 +1,15 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'gulp-untar' {
+	import type { Transform } from 'stream';
+
+	/**
+	 * Extract TAR files
+	 */
+	function untar(): Transform;
+
+	export = untar;
+}

build/lib/typings/rcedit.d.ts

@@ -0,0 +1,5 @@
+
+declare module 'rcedit' {
+
+	export default function rcedit(exePath, options, cb): Promise<void>;
+}