add javascript and css linting

.eslintrc.json

@@ -0,0 +1,36 @@
+{
+    "plugins": ["compat"],
+    "extends": ["plugin:compat/recommended"],
+    "env": {
+      "browser": true,
+      "es6": true
+    },
+    "ignorePatterns":[
+      "/assets/js/sse.js",
+      "/assets/js/polyfills/*.js",
+      "/assets/videojs/*",
+      "**/*.min.js"
+    ],
+    "rules": {
+      "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
+      "eol-last": ["error", "always"],
+      "indent": ["error", 4, { "SwitchCase": 1 }],
+      "linebreak-style": ["error", "unix"],
+      "no-multiple-empty-lines": "error",
+      "no-trailing-spaces": "error",
+      "no-mixed-spaces-and-tabs": "error",
+      "operator-linebreak": ["error", "after"],
+      "semi": ["error", "always"],
+      "comma-dangle": ["error", "never"]
+    },
+    "settings": {
+      "polyfills": [
+        "Array.from",
+        "Math.sign",
+        "URL",
+        "URLSearchParams",
+        "Symbol.iterator",
+        "location.origin"
+      ]
+    }
+}

.gitignore

@@ -7,3 +7,4 @@
 /invidious
 /sentry
 /config/config.yml
+/node_modules/

.stylelintrc.json

@@ -0,0 +1,21 @@
+{
+    "plugins": [
+        "@double-great/stylelint-a11y"
+    ],
+    "ignoreFiles": [
+        "assets/**/quality-selector.css",
+        "assets/**/*min.css",
+        "assets/videojs/**"
+    ],
+    "rules": {
+        "a11y/media-prefers-reduced-motion": true,
+        "color-no-invalid-hex": true,
+        "font-family-no-duplicate-names": true,
+        "function-calc-no-unspaced-operator": true,
+        "length-zero-no-unit": true,
+        "media-query-no-invalid": true,
+        "no-invalid-double-slash-comments": true,
+        "no-irregular-whitespace": true,
+        "string-no-newline": true
+    }
+}

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "invidious-lint",
+  "version": "1.0.0",
+  "description": "Lint invidious js and css files",
+  "scripts": {
+    "lint-js": "eslint --ext .js ./assets/js/",
+    "lint-css": "stylelint \"./assets/**/*.css\""
+  },
+  "devDependencies": {
+    "@double-great/stylelint-a11y": "^2.0.2",
+    "eslint": "^8.56.0",
+    "eslint-plugin-compat": "^4.2.0",
+    "stylelint": "^15.11.0"
+  },
+  "browserslist": [
+    "ie >= 9",
+    "chrome >= 45",
+    "ChromeAndroid >= 45",
+    "Firefox >= 45",
+    "samsung 4",
+    "safari >= 10",
+    "ios >= 8"
+  ]
+}