diff --git a/gulpfile.js b/gulpfile.js
index c6a2c647..4a4490d0 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -2,9 +2,9 @@
 // Licensed under the MIT license. See LICENSE file in the project root for details.
 
 const gulp = require("gulp");
-const log = require('fancy-log');
-const istanbul = require('gulp-istanbul');
-const isparta = require('isparta');
+const log = require("fancy-log");
+const istanbul = require("gulp-istanbul");
+const isparta = require("isparta");
 const sourcemaps = require("gulp-sourcemaps");
 const path = require("path");
 const preprocess = require("gulp-preprocess");
@@ -17,37 +17,37 @@ const minimist = require("minimist");
 const os = require("os");
 const fs = require("fs");
 const Q = require("q");
-const es = require('event-stream');
-const remapIstanbul = require('remap-istanbul/lib/gulpRemapIstanbul');
-const execSync = require('child_process').execSync;
-const nls = require('vscode-nls-dev');
+const es = require("event-stream");
+const remapIstanbul = require("remap-istanbul/lib/gulpRemapIstanbul");
+const execSync = require("child_process").execSync;
+const nls = require("vscode-nls-dev");
 
 const copyright = GulpExtras.checkCopyright;
 const imports = GulpExtras.checkImports;
 const executeCommand = GulpExtras.executeCommand;
 
-const transifexApiHostname = 'www.transifex.com'
-const transifexApiName = 'api';
+const transifexApiHostname = "www.transifex.com"
+const transifexApiName = "api";
 const transifexApiToken = process.env.TRANSIFEX_API_TOKEN;
-const transifexProjectName = 'vscode-extensions';
-const transifexExtensionName = 'vscode-react-native';
+const transifexProjectName = "vscode-extensions";
+const transifexExtensionName = "vscode-react-native";
 
 const defaultLanguages = [
-	{ id: 'zh-tw', folderName: 'cht', transifexId: 'zh-hant' },
-	{ id: 'zh-cn', folderName: 'chs', transifexId: 'zh-hans' },
-	{ id: 'ja', folderName: 'jpn' },
-	{ id: 'ko', folderName: 'kor' },
-	{ id: 'de', folderName: 'deu' },
-	{ id: 'fr', folderName: 'fra' },
-	{ id: 'es', folderName: 'esn' },
-	{ id: 'ru', folderName: 'rus' },
-    { id: 'it', folderName: 'ita' },
+	{ id: "zh-tw", folderName: "cht", transifexId: "zh-hant" },
+	{ id: "zh-cn", folderName: "chs", transifexId: "zh-hans" },
+	{ id: "ja", folderName: "jpn" },
+	{ id: "ko", folderName: "kor" },
+	{ id: "de", folderName: "deu" },
+	{ id: "fr", folderName: "fra" },
+	{ id: "es", folderName: "esn" },
+	{ id: "ru", folderName: "rus" },
+    { id: "it", folderName: "ita" },
 
     // These language-pack languages are included for VS but excluded from the vscode package
-    { id: 'cs', folderName: 'csy' },
-    { id: 'tr', folderName: 'trk' },
-    { id: 'pt-br', folderName: 'ptb', transifexId: 'pt_BR' },
-    { id: 'pl', folderName: 'plk' }
+    { id: "cs", folderName: "csy" },
+    { id: "tr", folderName: "trk" },
+    { id: "pt-br", folderName: "ptb", transifexId: "pt_BR" },
+    { id: "pl", folderName: "plk" }
 ];
 
 var srcPath = "src";
@@ -67,17 +67,27 @@ var options = minimist(process.argv.slice(2), knownOptions);
 
 var tsProject = ts.createProject("tsconfig.json");
 
-// TODO: The file property should point to the generated source (this implementation adds an extra folder to the path)
-// We should also make sure that we always generate urls in all the path properties (We shouldn't have \\s. This seems to
-// be an issue on Windows platforms)
-gulp.task("build", ["check-imports", "check-copyright"], build);
+gulp.task("check-imports", function () {
+    return tsProject.src()
+        .pipe(imports());
+});
 
-gulp.task("quick-build", build);
+gulp.task("check-copyright", function () {
+    return gulp.src([
+        "**/*.ts",
+        "**/*.js",
+        "!**/*.d.ts",
+        "!coverage/**",
+        "!node_modules/**",
+        "!test/**/*.js",
+        "!SampleApplication/**",
+        "!test/resources/sampleReactNative022Project/**/*.js"
+    ])
+        .pipe(copyright());
+});
 
-// Configuring build task
-var failOnError = true;
-var buildNls = true;
-function build(callback) {
+
+function build(failOnError, buildNls) {
     var tsProject = ts.createProject("tsconfig.json");
     var isProd = options.env === "production";
     var preprocessorContext = isProd ? { PROD: true } : { DEBUG: true };
@@ -86,49 +96,62 @@ function build(callback) {
     var tsResult = tsProject.src()
         .pipe(preprocess({ context: preprocessorContext })) //To set environment variables in-line
         .pipe(sourcemaps.init())
-        .pipe(tsProject())
-        .on("error", function (e) {
-            callback(e);
-        });
-
+        .pipe(tsProject());
 
         return tsResult.js
         .pipe(buildNls ? nls.rewriteLocalizeCalls() : es.through())
-        .pipe(buildNls ? nls.createAdditionalLanguageFiles(defaultLanguages, 'i18n', '.') : es.through())
-		.pipe(buildNls ? nls.bundleMetaDataFiles('vsmobile.vscode-react-native', '.') : es.through())
+        .pipe(buildNls ? nls.createAdditionalLanguageFiles(defaultLanguages, "i18n", ".") : es.through())
+		.pipe(buildNls ? nls.bundleMetaDataFiles("vsmobile.vscode-react-native", ".") : es.through())
 		.pipe(buildNls ? nls.bundleLanguageFiles() : es.through())
-        .pipe(sourcemaps.write('.', { includeContent: false, sourceRoot: '.' }))
+        .pipe(sourcemaps.write(".", { includeContent: false, sourceRoot: "." }))
         .pipe(gulp.dest(function (file) {
             return file.cwd;
         }))
-        .once('error', () => {
+        .once("error", () => {
             gotError = true;
         })
-        .once('finish', () => {
+        .once("finish", () => {
             if (failOnError && gotError) {
                 process.exit(1);
             }
         });
 }
 
-gulp.task("watch", ["build"], function (cb) {
+// TODO: The file property should point to the generated source (this implementation adds an extra folder to the path)
+// We should also make sure that we always generate urls in all the path properties (We shouldn"t have \\s. This seems to
+// be an issue on Windows platforms)
+gulp.task("build",  gulp.series("check-imports", "check-copyright", function (done) {
+    build(true, true);
+    done();
+}));
+
+gulp.task("build-dev",  gulp.series("check-imports", "check-copyright", function (done) {
+    build(false, false);
+    done();
+}));
+
+gulp.task("quick-build", build);
+
+gulp.task("watch", gulp.series("build", function () {
     log("Watching build sources...");
-    return gulp.watch(sources, ["build"]);
-});
+    return gulp.watch(sources, gulp.series("build"));
+}));
 
-gulp.task("default", function (callback) {
-    runSequence("clean", "build", "tslint", callback);
+gulp.task("clean", function () {
+    var del = require("del");
+    var pathsToDelete = [
+        "src/**/*.js",
+        "src/**/*.js.map",
+        "test/**/*.js",
+        "test/**/*.js.map",
+        "out/",
+        "!test/resources/sampleReactNative022Project/**/*.js",
+        ".vscode-test/",
+        "nls.*.json"
+    ]
+    return del(pathsToDelete, { force: true });
 });
 
-var lintSources = [
-    srcPath,
-    testPath
-].map(function (tsFolder) { return tsFolder + "/**/*.ts"; });
-lintSources = lintSources.concat([
-    "!src/typings/**",
-    "!test/resources/sampleReactNative022Project/**"
-]);
-
 var libtslint = require("tslint");
 var tslint = require("gulp-tslint");
 gulp.task("tslint", function () {
@@ -141,6 +164,17 @@ gulp.task("tslint", function () {
         .pipe(tslint.report());
 });
 
+gulp.task("default", gulp.series("clean", "build", "tslint"));
+
+var lintSources = [
+    srcPath,
+    testPath
+].map(function (tsFolder) { return tsFolder + "/**/*.ts"; });
+lintSources = lintSources.concat([
+    "!src/typings/**",
+    "!test/resources/sampleReactNative022Project/**"
+]);
+
 function test() {
     // Check if arguments were passed
     if (options.pattern) {
@@ -158,9 +192,9 @@ function test() {
         }));
 }
 
-gulp.task("test", ["build", "tslint"], test);
+gulp.task("test", gulp.series("build", "tslint", test));
 
-gulp.task('coverage:instrument', function () {
+gulp.task("coverage:instrument", function () {
     return gulp.src(["src/**/*.js", "!test/**"])
         .pipe(istanbul({
             // Use the isparta instrumenter (code coverage for ES6)
@@ -171,69 +205,33 @@ gulp.task('coverage:instrument', function () {
         .pipe(istanbul.hookRequire());
 });
 
-gulp.task('coverage:report', function (done) {
+gulp.task("coverage:report", function (done) {
     return gulp.src(
         ["src/**/*.js", "!test/**"],
         { read: false }
     )
         .pipe(istanbul.writeReports({
-            reporters: ['json', 'text-summary']
+            reporters: ["json", "text-summary"]
         }));
 });
 
-gulp.task('coverage:remap', function () {
-    return gulp.src('coverage/coverage-final.json')
+gulp.task("coverage:remap", function () {
+    return gulp.src("coverage/coverage-final.json")
         .pipe(remapIstanbul({
             reports: {
-                'json': 'coverage/coverage.json',
-                'html': 'coverage/html-report'
+                "json": "coverage/coverage.json",
+                "html": "coverage/html-report"
             }
         }));
 });
 
-gulp.task("test:coverage", function (done) {
-    runSequence("quick-build", 'coverage:instrument',
-        "test-no-build", 'coverage:report', 'coverage:remap', done);
-});
-
 gulp.task("test-no-build", test);
 
-gulp.task("check-imports", function (cb) {
-    return tsProject.src()
-        .pipe(imports());
-});
+gulp.task("test:coverage", gulp.series("quick-build", "coverage:instrument", "test-no-build", "coverage:report", "coverage:remap"));
 
-gulp.task("check-copyright", function (cb) {
-    return gulp.src([
-        "**/*.ts",
-        "**/*.js",
-        "!**/*.d.ts",
-        "!coverage/**",
-        "!node_modules/**",
-        "!test/**/*.js",
-        "!SampleApplication/**",
-        "!test/resources/sampleReactNative022Project/**/*.js"
-    ])
-        .pipe(copyright());
-});
-
-gulp.task("watch-build-test", ["build", "build-test"], function () {
-    return gulp.watch(sources, ["build", "build-test"]);
-});
-
-gulp.task("clean", function () {
-    var del = require("del");
-    var pathsToDelete = [
-        "src/**/*.js",
-        "src/**/*.js.map",
-        "test/**/*.js",
-        "test/**/*.js.map",
-        "out/",
-        "!test/resources/sampleReactNative022Project/**/*.js",
-        ".vscode-test/"
-    ]
-    return del(pathsToDelete, { force: true });
-});
+gulp.task("watch-build-test", gulp.series("build", "test", function () {
+    return gulp.watch(sources, gulp.series("build", "test"));
+}));
 
 gulp.task("package", function (callback) {
     var command = path.join(__dirname, "node_modules", ".bin", "vsce");
@@ -241,7 +239,7 @@ gulp.task("package", function (callback) {
     executeCommand(command, args, callback);
 });
 
-gulp.task("release", ["build"], function () {
+gulp.task("release", gulp.series("build", function () {
     var licenseFiles = ["LICENSE.txt", "ThirdPartyNotices.txt"];
     var backupFolder = path.resolve(path.join(os.tmpdir(), "vscode-react-native"));
     if (!fs.existsSync(backupFolder)) {
@@ -273,31 +271,31 @@ gulp.task("release", ["build"], function () {
                 fs.writeFileSync(path.join(__dirname, fileName), fs.readFileSync(path.join(backupFolder, fileName)));
             });
         });
-});
+}));
 
 // Creates package.i18n.json files for all languages to {workspaceRoot}/i18n folder
-gulp.task('add-i18n', function () {
-    return gulp.src(['package.nls.json'])
-        .pipe(nls.createAdditionalLanguageFiles(defaultLanguages, 'i18n'))
-        .pipe(gulp.dest('.'));
+gulp.task("add-i18n", function () {
+    return gulp.src(["package.nls.json"])
+        .pipe(nls.createAdditionalLanguageFiles(defaultLanguages, "i18n"))
+        .pipe(gulp.dest("."));
 });
 
 // Gathers all strings to Transifex readable .xliff file for translating and pushes them to Transifex
-gulp.task('transifex-push', ['build'], function () {
-    return gulp.src(['package.nls.json', 'nls.metadata.header.json','nls.metadata.json'])
+gulp.task("transifex-push", gulp.series("build", function () {
+    return gulp.src(["package.nls.json", "nls.metadata.header.json","nls.metadata.json"])
         .pipe(nls.createXlfFiles(transifexProjectName, transifexExtensionName))
         .pipe(nls.pushXlfFiles(transifexApiHostname, transifexApiName, transifexApiToken));
-});
+}));
 
 // Creates Transifex readable .xliff file and saves it locally
-gulp.task('transifex-push-test', ['build'], function() {
-    return gulp.src(['package.nls.json', 'nls.metadata.header.json','nls.metadata.json'])
+gulp.task("transifex-push-test", gulp.series("build", function() {
+    return gulp.src(["package.nls.json", "nls.metadata.header.json","nls.metadata.json"])
         .pipe(nls.createXlfFiles(transifexProjectName, transifexExtensionName))
-        .pipe(gulp.dest(path.join('..', `${transifexExtensionName}-push-test`)));
-});
+        .pipe(gulp.dest(path.join("..", `${transifexExtensionName}-push-test`)));
+}));
 
 // Gets the files with localized strings from Transifex
-gulp.task('transifex-pull', function () {
+gulp.task("transifex-pull", function () {
     return es.merge(defaultLanguages.map(function(language) {
         return nls.pullXlfFiles(transifexApiHostname, transifexApiName, transifexApiToken, language, [{ name: transifexExtensionName, project: transifexProjectName }]).
             pipe(gulp.dest(`../${transifexExtensionName}-localization/${language.folderName}`));
@@ -305,10 +303,10 @@ gulp.task('transifex-pull', function () {
 });
 
 // Imports localization from raw localized Transifex strings to VS Code .i18n.json files
-gulp.task('i18n-import', function() {
+gulp.task("i18n-import", function() {
     return es.merge(defaultLanguages.map(function(language) {
         return gulp.src(`../${transifexExtensionName}-localization/${language.folderName}/**/*.xlf`)
             .pipe(nls.prepareJsonFiles())
-            .pipe(gulp.dest(path.join('./i18n', language.folderName)));
+            .pipe(gulp.dest(path.join("./i18n", language.folderName)));
     }));
 });
diff --git a/package-lock.json b/package-lock.json
index 0ea00251..2ea54ffe 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -366,12 +366,30 @@
 			"integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
 			"dev": true
 		},
+		"arr-filter": {
+			"version": "1.1.2",
+			"resolved": "https://registry.npmjs.org/arr-filter/-/arr-filter-1.1.2.tgz",
+			"integrity": "sha1-Q/3d0JHo7xGqTEXZzcGOLf8XEe4=",
+			"dev": true,
+			"requires": {
+				"make-iterator": "^1.0.0"
+			}
+		},
 		"arr-flatten": {
 			"version": "1.1.0",
 			"resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
 			"integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
 			"dev": true
 		},
+		"arr-map": {
+			"version": "2.0.2",
+			"resolved": "https://registry.npmjs.org/arr-map/-/arr-map-2.0.2.tgz",
+			"integrity": "sha1-Onc0X/wc814qkYJWAfnljy4kysQ=",
+			"dev": true,
+			"requires": {
+				"make-iterator": "^1.0.0"
+			}
+		},
 		"arr-union": {
 			"version": "3.1.0",
 			"resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
@@ -408,6 +426,41 @@
 			"integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
 			"dev": true
 		},
+		"array-initial": {
+			"version": "1.1.0",
+			"resolved": "https://registry.npmjs.org/array-initial/-/array-initial-1.1.0.tgz",
+			"integrity": "sha1-L6dLJnOTccOUe9enrcc74zSz15U=",
+			"dev": true,
+			"requires": {
+				"array-slice": "^1.0.0",
+				"is-number": "^4.0.0"
+			},
+			"dependencies": {
+				"is-number": {
+					"version": "4.0.0",
+					"resolved": "https://registry.npmjs.org/is-number/-/is-number-4.0.0.tgz",
+					"integrity": "sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==",
+					"dev": true
+				}
+			}
+		},
+		"array-last": {
+			"version": "1.3.0",
+			"resolved": "https://registry.npmjs.org/array-last/-/array-last-1.3.0.tgz",
+			"integrity": "sha512-eOCut5rXlI6aCOS7Z7kCplKRKyiFQ6dHFBem4PwlwKeNFk2/XxTrhRh5T9PyaEWGy/NHTZWbY+nsZlNFJu9rYg==",
+			"dev": true,
+			"requires": {
+				"is-number": "^4.0.0"
+			},
+			"dependencies": {
+				"is-number": {
+					"version": "4.0.0",
+					"resolved": "https://registry.npmjs.org/is-number/-/is-number-4.0.0.tgz",
+					"integrity": "sha512-rSklcAIlf1OmFdyAqbnWTLVelsQ58uvZ66S/ZyawjWqIviTWCjg2PzVGw8WUA+nNuPTqb4wgA+NszrJ+08LlgQ==",
+					"dev": true
+				}
+			}
+		},
 		"array-map": {
 			"version": "0.0.0",
 			"resolved": "https://registry.npmjs.org/array-map/-/array-map-0.0.0.tgz",
@@ -426,6 +479,25 @@
 			"integrity": "sha512-B1qMD3RBP7O8o0H2KbrXDyB0IccejMF15+87Lvlor12ONPRHP6gTjXMNkt/d3ZuOGbAe66hFmaCfECI24Ufp6w==",
 			"dev": true
 		},
+		"array-sort": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/array-sort/-/array-sort-1.0.0.tgz",
+			"integrity": "sha512-ihLeJkonmdiAsD7vpgN3CRcx2J2S0TiYW+IS/5zHBI7mKUq3ySvBdzzBfD236ubDBQFiiyG3SWCPc+msQ9KoYg==",
+			"dev": true,
+			"requires": {
+				"default-compare": "^1.0.0",
+				"get-value": "^2.0.6",
+				"kind-of": "^5.0.2"
+			},
+			"dependencies": {
+				"kind-of": {
+					"version": "5.1.0",
+					"resolved": "https://registry.npmjs.org/kind-of/-/kind-of-5.1.0.tgz",
+					"integrity": "sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw==",
+					"dev": true
+				}
+			}
+		},
 		"array-union": {
 			"version": "1.0.2",
 			"resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
@@ -486,6 +558,26 @@
 			"integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
 			"dev": true
 		},
+		"async-done": {
+			"version": "1.3.1",
+			"resolved": "https://registry.npmjs.org/async-done/-/async-done-1.3.1.tgz",
+			"integrity": "sha512-R1BaUeJ4PMoLNJuk+0tLJgjmEqVsdN118+Z8O+alhnQDQgy0kmD5Mqi0DNEmMx2LM0Ed5yekKu+ZXYvIHceicg==",
+			"dev": true,
+			"requires": {
+				"end-of-stream": "^1.1.0",
+				"once": "^1.3.2",
+				"process-nextick-args": "^1.0.7",
+				"stream-exhaust": "^1.0.1"
+			},
+			"dependencies": {
+				"process-nextick-args": {
+					"version": "1.0.7",
+					"resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-1.0.7.tgz",
+					"integrity": "sha1-FQ4gt1ZZCtP5EJPyWk8q2L/zC6M=",
+					"dev": true
+				}
+			}
+		},
 		"async-each": {
 			"version": "1.0.1",
 			"resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
@@ -497,6 +589,15 @@
 			"resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
 			"integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg=="
 		},
+		"async-settle": {
+			"version": "1.0.0",
+			"resolved": "https://registry.npmjs.org/async-settle/-/async-settle-1.0.0.tgz",
+			"integrity": "sha1-HQqRS7Aldb7IqPOnTlCA9yssDGs=",
+			"dev": true,
+			"requires": {
+				"async-done": "^1.2.2"
+			}
+		},
 		"asynckit": {
 			"version": "0.4.0",
 			"resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -792,6 +893,23 @@
 			"integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
 			"dev": true
 		},
+		"bach": {
+			"version": "1.2.0",
+			"resolved": "https://registry.npmjs.org/bach/-/bach-1.2.0.tgz",
+			"integrity": "sha1-Szzpa/JxNPeaG0FKUcFONMO9mIA=",
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@@ -11195,9 +11381,9 @@
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diff --git a/package.json b/package.json
index 215e27dc..7fe8c696 100644
--- a/package.json
+++ b/package.json
@@ -541,11 +541,11 @@
 		"del": "^2.2.0",
 		"event-stream": "3.3.4",
 		"fancy-log": "^1.3.2",
-		"gulp": "^3.9.1",
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 		"gulp-install": "^1.1.0",
 		"gulp-istanbul": "^1.1.2",
-		"gulp-mocha": "^3.0.1",
-		"gulp-preprocess": "^2.0.0",
+		"gulp-mocha": "^6.0.0",
+		"gulp-preprocess": "^3.0.1",
 		"gulp-sequence": "1.0.0",
 		"gulp-sourcemaps": "^1.6.0",
 		"gulp-tslint": "^8.1.2",
@@ -554,8 +554,8 @@
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 		"jest-cli": "^22.1.4",
 		"minimist": "^1.2.0",
-		"mocha": "^3.2.0",
-		"mocha-teamcity-reporter": "^1.0.0",
+		"mocha": "^4.1.0",
+		"mocha-teamcity-reporter": "^2.5.1",
 		"mock-fs": "^4.4.1",
 		"plugin-error": "^1.0.1",
 		"remap-istanbul": "^0.9.5",
@@ -572,7 +572,7 @@
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 		"typescript": "^2.8.3",
 		"vsce": "^1.3.0",
-		"vscode": "^1.1.22",
+		"vscode": "^1.1.24",
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 	},
 	"extensionDependencies": [