Fix #210: Issues with gulp4

gulpfile.js

@@ -163,15 +163,15 @@ gulp.task('locales', function() {
 
 gulp.task('watch', function() {
     debug = true;
-    var watcher = gulp.watch(paths.scripts, ['scripts']);
+    var watcher = gulp.watch(paths.scripts, gulp.series('scripts'));
     watcher.on('change', function(event) {
         if (event.type === 'deleted') {
             delete cached.caches.scripts[event.path];
             remember.forget('scripts', event.path);
         }
     });
-    gulp.watch(paths.styles, ['styles']);
-    gulp.watch(paths.layersConfig, ['layers_config']);
+    gulp.watch(paths.styles, gulp.series('styles'));
+    gulp.watch(paths.layersConfig, gulp.series('layers_config'));
 });
 
 // Print paths to console, for manually debugging the gulp build
@@ -203,11 +203,6 @@ gulp.task('inject', function() {
         .pipe(gulp.dest('.'));
 });
 
-gulp.task('debug', function() {
-    debug = true;
-    gulp.start('default');
-});
-
 var pkg = require('./package.json');
 var tags = { patch: 'patch', minor: 'minor', major: 'major' };
 var nextVersion;
@@ -381,6 +376,14 @@ gulp.task(
     )
 );
 
+gulp.task(
+    'debug',
+    gulp.series(function(done) {
+        debug = true;
+        done();
+    }, 'default')
+);
+
 gulp.task(
     'release:zip',
     gulp.series('release:tag', 'default', function() {

package.json

@@ -9,7 +9,8 @@
         "transifex-pull": "tx pull --all --minimum-perc 1 --force && (git add locales/*.json && git commit locales/*.json -m 'Update translations' || true)",
         "layers": "node layers/josm/extract.js && node layers/collection/extract.js",
         "test": "gulp",
-        "prettier": "prettier --write '**/*'"
+        "prettier": "prettier --write '**/*'",
+        "watch": "gulp && gulp watch"
     },
     "husky": {
         "hooks": {