Prepare frontend dev stack

.bowerrc

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+{
+    "directory": "Resources/public/vendor"
+}

.editorconfig

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+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

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+Resources/public/admin/css/style.css binary -merge
+Resources/public/admin/css/*.css.map binary -merge

.gitignore

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 .idea/
+.tmp/
 coverage/
 extension/
-vendor/
+node_modules/
+/vendor/
 var/
 composer.phar
 composer.lock

Gruntfile.js

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+'use strict';
+
+module.exports = function (grunt) {
+    // Time how long tasks take. Can help when optimizing build times
+    require('time-grunt')(grunt);
+
+    // Automatically load required grunt tasks
+    require('jit-grunt')(grunt, {
+        lockfile: 'grunt-lock'
+    });
+
+    // Configurable paths
+    var config = {
+        sass_dir: 'Resources/sass/admin',
+        public_dir: 'Resources/public/admin'
+    };
+
+    // Define the configuration for all the tasks
+    grunt.initConfig({
+        // Project settings
+        config: config,
+
+        //Prevent multiple grunt instances
+        lockfile: {
+            grunt: {
+                path: 'grunt.lock'
+            }
+        },
+
+        // Watches files for changes and runs tasks based on the changed files
+        watch: {
+            gruntfile: {
+                files: ['Gruntfile.js'],
+                options: {
+                    reload: true
+                }
+            },
+            sass: {
+                files: ['<%= config.sass_dir %>/{,*/}*.{scss,sass}'],
+                tasks: ['sass', 'postcss']
+            }
+        },
+
+        // Compiles Sass to CSS and generates necessary files if requested
+        sass: {
+            options: {
+                sourceMap: true,
+                sourceMapEmbed: true,
+                sourceMapContents: true,
+                includePaths: ['.']
+            },
+            dist: {
+                files: [{
+                    expand: true,
+                    cwd: '<%= config.sass_dir %>',
+                    src: ['*.{scss,sass}'],
+                    dest: '.tmp/css',
+                    ext: '.css'
+                }]
+            }
+        },
+
+        postcss: {
+            options: {
+                map: true,
+                processors: [
+                    // Add vendor prefixed styles
+                    require('autoprefixer-core')({
+                        browsers: ['> 1%', 'last 3 versions', 'Firefox ESR', 'Opera 12.1']
+                    })
+                ]
+            },
+            dist: {
+                files: [{
+                    expand: true,
+                    cwd: '.tmp/css/',
+                    src: '{,*/}*.css',
+                    dest: '<%= config.public_dir %>/css'
+                }]
+            }
+        }
+    });
+
+    grunt.registerTask('serve', 'Start the server and preview your app', function () {
+        grunt.task.run([
+            'lockfile',
+            'sass:dist',
+            'postcss',
+            'watch'
+        ]);
+    });
+
+    grunt.registerTask('default', [
+        'serve'
+    ]);
+};

Resources/public/vendor/jquery/.bower.json

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+{
+  "name": "jquery",
+  "main": "dist/jquery.js",
+  "license": "MIT",
+  "ignore": [
+    "package.json"
+  ],
+  "keywords": [
+    "jquery",
+    "javascript",
+    "browser",
+    "library"
+  ],
+  "homepage": "https://github.com/jquery/jquery-dist",
+  "version": "3.1.1",
+  "_release": "3.1.1",
+  "_resolution": {
+    "type": "version",
+    "tag": "3.1.1",
+    "commit": "1b30f3ad466ebf2714d47eda34dbd7fdf6849fe3"
+  },
+  "_source": "https://github.com/jquery/jquery-dist.git",
+  "_target": "^3.0",
+  "_originalSource": "jquery"
+}