MOBILE-2597 gulp: Update gulp to v4

gulpfile.js

@@ -157,7 +157,7 @@ function buildLangs(filenames, langPaths, buildDest, done) {
             return path + language + '.json';
         });
 
-        gulp.src(paths)
+        gulp.src(paths, { allowEmpty: true })
             .pipe(slash())
             .pipe(clipEmptyFiles())
             .pipe(through(function(file) {
@@ -220,16 +220,6 @@ var appLangFiles = ['ar.json', 'bg.json', 'ca.json', 'cs.json', 'da.json', 'de.j
         config: './src/config.json',
     };
 
-gulp.task('default', ['lang', 'config']);
-
-gulp.task('watch', function() {
-    var langsPaths = paths.lang.map(function(path) {
-        return path + '*.json';
-    });
-    gulp.watch(langsPaths, { interval: 500 }, ['lang']);
-    gulp.watch(paths.config, { interval: 500 }, ['config']);
-});
-
 // Build the language files into a single file per language.
 gulp.task('lang', function(done) {
     // Get filenames to know which languages are available.
@@ -292,6 +282,16 @@ gulp.task('config', function(done) {
         .on('end', done);
 });
 
+gulp.task('default', gulp.parallel('lang', 'config'));
+
+gulp.task('watch', function() {
+    var langsPaths = paths.lang.map(function(path) {
+        return path + '*.json';
+    });
+    gulp.watch(langsPaths, { interval: 500 }, gulp.parallel('lang'));
+    gulp.watch(paths.config, { interval: 500 }, gulp.parallel('config'));
+});
+
 var templatesSrc = [
         './src/components/**/*.html',
         './src/core/**/components/**/*.html',
@@ -306,7 +306,7 @@ var templatesSrc = [
 gulp.task('copy-component-templates', function(done) {
     deleteFolderRecursive(templatesDest);
 
-    gulp.src(templatesSrc)
+    gulp.src(templatesSrc, { allowEmpty: true })
         .pipe(flatten())
         .pipe(gulp.dest(templatesDest))
         .on('end', done);

ionic.config.json

@@ -1,10 +1,10 @@
 {
   "name": "moodlemobile",
-  "app_id": "com.moodle.moodlemobile",
-  "type": "ionic-angular",
   "integrations": {
     "cordova": {},
     "gulp": {}
   },
-  "watchPatterns": []
-}
+  "type": "ionic-angular",
+  "watchPatterns": [],
+  "pro_id": "com.moodle.moodlemobile"
+}

package.json

@@ -93,11 +93,12 @@
   "devDependencies": {
     "@ionic/app-scripts": "3.1.9",
     "electron-rebuild": "^1.8.1",
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.0",
     "gulp-clip-empty-files": "^0.1.2",
     "gulp-flatten": "^0.4.0",
     "gulp-rename": "^1.2.2",
     "gulp-slash": "^1.1.3",
+    "gulp-util": "^3.0.8",
     "node-loader": "^0.6.0",
     "through": "^2.3.8",
     "typescript": "~2.6.2",
@@ -168,4 +169,4 @@
       "confinement": "classic"
     }
   }
-}
+}

upgrade.txt

@@ -1,6 +1,11 @@
 This files describes API changes in the Moodle Mobile app,
 information provided here is intended especially for developers.
 
+=== 3.6.0 ===
+
+- gulp was updated to v4. In order for gulp to work, you need to install gulp-cli: npm install -g gulp-cli
+  It's also recommended to update ionic cli to v4, otherwise some errors could be raised while building: npm install -g ionic
+
 === 3.5.2 ===
 
 - CoreChartDirective changed from directive to component (CoreChartComponent) and the selector to use it changed from canvas[core-chart] to core-chart.