Upgrade to gulp4

build/gulpfile.extensions.js

@@ -80,6 +80,7 @@ const tasks = compilations.map(function (tsconfigFile) {
 				.pipe(tsFilter)
 				.pipe(util.loadSourcemaps())
 				.pipe(compilation())
+				.pipe(util.toLatestVinylFile())
 				.pipe(build ? nlsDev.rewriteLocalizeCalls() : es.through())
 				.pipe(build ? util.stripSourceMappingURL() : es.through())
 				.pipe(sourcemaps.write('.', {

build/lib/compilation.js

@@ -58,6 +58,7 @@ function createCompile(src, build, emitError) {
             .pipe(tsFilter)
             .pipe(util.loadSourcemaps())
             .pipe(ts(token))
+            .pipe(util.toLatestVinylFile())
             .pipe(noDeclarationsFilter)
             .pipe(build ? nls() : es.through())
             .pipe(noDeclarationsFilter.restore)

build/lib/compilation.ts

@@ -66,6 +66,7 @@ function createCompile(src: string, build: boolean, emitError?: boolean): (token
 			.pipe(tsFilter)
 			.pipe(util.loadSourcemaps())
 			.pipe(ts(token))
+			.pipe(util.toLatestVinylFile())
 			.pipe(noDeclarationsFilter)
 			.pipe(build ? nls() : es.through())
 			.pipe(noDeclarationsFilter.restore)

build/lib/typings/vinyl.d.ts

@@ -11,6 +11,9 @@ declare module "vinyl" {
 	 * A virtual file format.
 	 */
 	class File {
+
+		public static isVinyl(t: any): t is File;
+
 		constructor(options?: {
 			/**
 			* Default: process.cwd()

build/lib/util.js

@@ -98,6 +98,18 @@ function skipDirectories() {
     });
 }
 exports.skipDirectories = skipDirectories;
+/**
+ * gulp does not like anything except the latest VinylFile (it checks for VinylFile.isVinyl)
+ */
+function toLatestVinylFile() {
+    return es.mapSync(f => {
+        if (VinylFile.isVinyl(f)) {
+            return f;
+        }
+        return new VinylFile(f);
+    });
+}
+exports.toLatestVinylFile = toLatestVinylFile;
 function cleanNodeModule(name, excludes, includes) {
     const toGlob = (path) => '**/node_modules/' + name + (path ? '/' + path : '');
     const negate = (str) => '!' + str;

build/lib/util.ts

@@ -129,6 +129,18 @@ export function skipDirectories(): NodeJS.ReadWriteStream {
 	});
 }
 
+/**
+ * gulp does not like anything except the latest VinylFile (it checks for VinylFile.isVinyl)
+ */
+export function toLatestVinylFile(): NodeJS.ReadWriteStream {
+	return es.mapSync<VinylFile, VinylFile>(f => {
+		if (VinylFile.isVinyl(f)) {
+			return f;
+		}
+		return new VinylFile(f);
+	});
+}
+
 export function cleanNodeModule(name: string, excludes: string[], includes?: string[]): NodeJS.ReadWriteStream {
 	const toGlob = (path: string) => '**/node_modules/' + name + (path ? '/' + path : '');
 	const negate = (str: string) => '!' + str;

package.json

@@ -83,23 +83,23 @@
     "express": "^4.13.1",
     "fancy-log": "^1.3.3",
     "glob": "^5.0.13",
-    "gulp": "^3.8.9",
+    "gulp": "^4.0.0",
     "gulp-atom-electron": "^1.19.2",
-    "gulp-azure-storage": "^0.8.2",
+    "gulp-azure-storage": "^0.9.0",
     "gulp-buffer": "0.0.2",
-    "gulp-concat": "^2.6.0",
-    "gulp-cssnano": "^2.1.0",
-    "gulp-eslint": "^3.0.1",
-    "gulp-filter": "^3.0.0",
-    "gulp-flatmap": "^1.0.0",
-    "gulp-json-editor": "^2.2.1",
+    "gulp-concat": "^2.6.1",
+    "gulp-cssnano": "^2.1.3",
+    "gulp-eslint": "^5.0.0",
+    "gulp-filter": "^5.1.0",
+    "gulp-flatmap": "^1.0.2",
+    "gulp-json-editor": "^2.5.0",
     "gulp-plumber": "^1.2.0",
     "gulp-remote-src": "^0.4.4",
     "gulp-rename": "^1.2.0",
     "gulp-replace": "^0.5.4",
-    "gulp-shell": "^0.5.2",
+    "gulp-shell": "^0.6.5",
     "gulp-tsb": "2.0.5",
-    "gulp-tslint": "^8.1.2",
+    "gulp-tslint": "^8.1.3",
     "gulp-uglify": "^3.0.0",
     "gulp-vinyl-zip": "^2.1.2",
     "husky": "^0.13.1",
@@ -119,7 +119,7 @@
     "pump": "^1.0.1",
     "queue": "3.0.6",
     "rcedit": "^1.1.0",
-    "remap-istanbul": "^0.6.4",
+    "remap-istanbul": "^0.13.0",
     "rimraf": "^2.2.8",
     "sinon": "^1.17.2",
     "source-map": "^0.4.4",
@@ -130,8 +130,8 @@
     "typescript-tslint-plugin": "^0.0.7",
     "uglify-es": "^3.0.18",
     "underscore": "^1.8.2",
-    "vinyl": "^0.4.5",
-    "vinyl-fs": "^2.4.3",
+    "vinyl": "^2.0.0",
+    "vinyl-fs": "^3.0.0",
     "vsce": "1.48.0",
     "vscode-nls-dev": "3.2.2",
     "webpack": "^4.16.5",