frontend: Use eslint with mozilla rules (#146)

Author: La0

frontend/.eslintrc.yml

@@ -0,0 +1,19 @@
+env:
+  browser: true
+  es6: true
+plugins:
+  - prettier
+  - mozilla
+extends:
+  - standard
+  - prettier
+  - plugin:mozilla/recommended
+globals:
+  Atomics: readonly
+  SharedArrayBuffer: readonly
+parserOptions:
+  ecmaVersion: 2018
+  sourceType: module
+rules:
+  max-len: off
+  prettier/prettier: "error"

frontend/package.json

@@ -27,9 +27,20 @@
     "babel-polyfill": "^6.26.0",
     "clean-webpack-plugin": "^3.0.0",
     "css-loader": "^3.0.0",
+    "eslint": "^6.2.2",
+    "eslint-config-prettier": "^6.2.0",
+    "eslint-config-standard": "^14.1.0",
+    "eslint-loader": "^3.0.0",
+    "eslint-plugin-fetch-options": "0.0.5",
+    "eslint-plugin-html": "^6.0.0",
+    "eslint-plugin-mozilla": "^2.1.0",
+    "eslint-plugin-no-unsanitized": "^3.0.2",
+    "eslint-plugin-prettier": "^3.1.0",
     "html-webpack-plugin": "^3.2.0",
     "mini-css-extract-plugin": "^0.8.0",
     "optimize-css-assets-webpack-plugin": "^5.0.3",
+    "prettier": "1.18.2",
+    "standard": "^14.1.0",
     "terser-webpack-plugin": "^1.3.0",
     "webpack": "^4.35.3",
     "webpack-cli": "^3.3.6",