Init package.json + setup prettier and eslint

.editorconfig

@@ -0,0 +1,14 @@
+# Editor configuration, see http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

.eslintrc.json

@@ -0,0 +1,25 @@
+{
+    "env": {
+        "browser": true,
+        "es6": true,
+        "greasemonkey": true,
+        "jquery": true
+    },
+    "extends": ["eslint:recommended", "plugin:prettier/recommended"],
+    "rules": {
+        "prettier/prettier": "error",
+        "prefer-template": "error",
+        "no-console": "off",
+        "no-empty": "warn",
+        "no-inner-declarations": "warn",
+        "no-global-assign": "warn",
+        "no-redeclare": "warn",
+        "no-self-assign": "warn",
+        "no-undef": "warn",
+        "no-useless-concat": "warn",
+        "no-useless-escape": "warn",
+        "no-unused-vars": "warn",
+        "no-var": "warn",
+        "use-isnan": "warn"
+    }
+}

.gitignore

@@ -4,3 +4,6 @@
 # JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
 .idea/
 *.iml
+
+# NPM
+node_modules/

.prettierrc.json

@@ -0,0 +1,7 @@
+{
+    "printWidth": 140,
+    "singleQuote": true,
+    "tabWidth": 4,
+    "useTabs": false,
+    "arrowParens": "avoid"
+}

package.json

@@ -0,0 +1,39 @@
+{
+    "name": "musicbrainz-userscripts",
+    "version": "1.0.0",
+    "description": "Collection of userscripts for MusicBrainz",
+    "main": "index.js",
+    "directories": {
+        "lib": "lib"
+    },
+    "scripts": {
+        "prettier:format": "prettier --write '{,**/}*.{js,json,md}'",
+        "lint": "npm run eslint",
+        "lint-fix": "npm run eslint -- --fix",
+        "eslint": "eslint ."
+    },
+    "repository": {
+        "type": "git",
+        "url": "git+https://github.com/murdos/musicbrainz-userscripts.git"
+    },
+    "keywords": [
+        "musicbrainz",
+        "userscripts",
+        "import",
+        "ui",
+        "improvements"
+    ],
+    "author": "Aurélien Mino <aurelien.mino@gmail.com>",
+    "license": "SEE LICENSE IN individual userscripts",
+    "bugs": {
+        "url": "https://github.com/murdos/musicbrainz-userscripts/issues"
+    },
+    "homepage": "https://github.com/murdos/musicbrainz-userscripts#readme",
+    "devDependencies": {
+        "eslint": "^5.9.0",
+        "eslint-config-prettier": "^3.3.0",
+        "eslint-plugin-import": "^2.14.0",
+        "eslint-plugin-prettier": "^3.0.0",
+        "prettier": "^1.15.2"
+    }
+}