Merged PR 47608: Update gulp to version 4.0 in powerbi-javascript

update gulp to version 4.0

Related work items: #205807

Author: johaddad

gulpfile.js

@@ -1,6 +1,7 @@
-var gulp = require('gulp-help')(require('gulp'));
+var gulp = require('gulp');
 var ghPages = require('gulp-gh-pages'),
   header = require('gulp-header'),
+  help = require('gulp-help-four'),
   rename = require('gulp-rename'),
   concat = require('gulp-concat'),
   uglify = require('gulp-uglify'),
@@ -18,10 +19,12 @@ var ghPages = require('gulp-gh-pages'),
   webpackStream = require('webpack-stream'),
   webpackConfig = require('./webpack.config'),
   webpackTestConfig = require('./webpack.test.config'),
-  runSequence = require('run-sequence'),
+  runSequence = require('gulp4-run-sequence'),
   argv = require('yargs').argv;
 ;
 
+help(gulp, undefined);
+
 var package = require('./package.json');
 var webpackBanner = package.name + " v" + package.version + " | (c) 2016 Microsoft Corporation " + package.license;
 var gulpBanner = "/*! " + webpackBanner + " */\n";

package.json

@@ -35,19 +35,20 @@
   "devDependencies": {
     "del": "^2.2.2",
     "es6-promise": "^3.2.1",
-    "gulp": "^3.9.0",
+    "gulp": "^4.0.2",
     "gulp-concat": "^2.6.0",
     "gulp-flatten": "^0.2.0",
     "gulp-gh-pages": "^0.5.4",
     "gulp-header": "^1.8.7",
-    "gulp-help": "^1.6.1",
+    "gulp-help-four": "^0.2.3",
     "gulp-rename": "^1.2.2",
     "gulp-replace": "^0.5.4",
     "gulp-sourcemaps": "^1.6.0",
     "gulp-tslint": "^4.3.4",
     "gulp-typedoc": "^2.0.0",
     "gulp-typescript": "^2.12.1",
     "gulp-uglify": "^1.5.1",
+    "gulp4-run-sequence": "^1.0.0",
     "http-server": "^0.11.1",
     "ignore-loader": "^0.1.1",
     "jasmine": "^2.4.1",
@@ -63,7 +64,6 @@
     "karma-spec-reporter": "0.0.23",
     "moment": "^2.14.1",
     "phantomjs-prebuilt": "^2.1.3",
-    "run-sequence": "^1.1.5",
     "ts-loader": "^0.8.1",
     "tslint": "^3.6.0",
     "typedoc": "^0.15.0",