add sourcemaps

gulpfile.js

@@ -1,6 +1,7 @@
 var gulp = require('gulp'),
 	concat = require('gulp-concat'),
-	eslint = require('gulp-eslint');
+	eslint = require('gulp-eslint'),
+	sourcemaps = require('gulp-sourcemaps');
 
 gulp.task('js', function() {
 	return gulp.src([
@@ -10,9 +11,15 @@ gulp.task('js', function() {
 			'js/services/**/*.js',
 			'js/filters/**/*.js'
 			])
+		// ESlint
 		.pipe(eslint())
 		.pipe(eslint.format())
-		.pipe(concat('script.js'))
+
+		// concat (+sourcemaps)
+		.pipe(sourcemaps.init())
+			.pipe(concat('script.js'))
+		.pipe(sourcemaps.write())
+
 		.pipe(gulp.dest('js/public'));
 });
 

package.json

@@ -17,8 +17,9 @@
   },
   "homepage": "https://github.com/owncloud/contacts#readme",
   "devDependencies": {
-    "gulp": "^3.9.0",
-    "gulp-concat": "^2.6.0",
-    "gulp-eslint": "^2.0.0"
+	  "gulp": "^3.9.0",
+      "gulp-concat": "^2.6.0",
+      "gulp-eslint": "^2.0.0",
+      "gulp-sourcemaps": "^1.6.0"
   }
 }