Moved dependency declaration into extra config file

Signed-off-by: Jim Martens <github@2martens.de>

_assets/gulp_config/dependencies.js

@@ -0,0 +1,13 @@
+"use strict";
+
+let dependencies = {};
+
+dependencies.files = [
+    "./node_modules/echo-js/dist/echo",
+    "./node_modules/popper.js/dist/popper",
+    "./node_modules/bootstrap/js/dist/util",
+    "./node_modules/bootstrap/js/dist/collapse",
+    "./node_modules/bootstrap/js/dist/tooltip",
+];
+
+module.exports = dependencies;

_assets/javascripts/main.js

@@ -1,11 +1,5 @@
 "use strict";
 
-//= require popper.js/dist/popper
-//= require echo-js/dist/echo
-//= require bootstrap/js/dist/util
-//= require bootstrap/js/dist/collapse
-//= require bootstrap/js/dist/tooltip
-
 $(function() {
     let mainMenu = $("#mainmenuNavbar");
     mainMenu.on("show.bs.collapse", function () {

gulpfile.js

@@ -21,6 +21,7 @@ const terser = require("gulp-terser");
 
 // Include paths file.
 const paths = require("./_assets/gulp_config/paths");
+const dependencies = require("./_assets/gulp_config/dependencies");
 
 // Uses Sass compiler to process styles, adds vendor prefixes, minifies, then
 // outputs file to the appropriate location.
@@ -64,6 +65,7 @@ gulp.task("clean:styles", function () {
 gulp.task("build:scripts:global", function () {
     return gulp.src([
         "node_modules/babel-polyfill/dist/polyfill.js",
+        dependencies.files,
         paths.jsFiles + "/global/lib" + paths.jsPattern,
         paths.jsFiles + "/global/*.js",
         paths.jsFiles + "/main.js"