migrate from jshint to eslint

.eslintrc.json

@@ -0,0 +1,29 @@
+{
+    "env": {
+        "browser": true,
+        "es2021": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 12,
+        "sourceType": "module"
+    },
+    "rules": {
+        "indent": [
+            "error",
+            4
+        ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "quotes": [
+            "error",
+            "double"
+        ],
+        "semi": [
+            "error",
+            "always"
+        ]
+    }
+}

.jshintrc

@@ -1,11 +0,0 @@
-{
-    "browser": true,
-    "module": true,
-    "curly": true,
-    "devel": true,
-    "esversion": 6,
-    "freeze": true,
-    "futurehostile": true,
-    "strict": "global",
-    "varstmt": true
-}

package.json

@@ -1,8 +1,8 @@
 {
   "dependencies": {
     "csso-cli": "^3.0.0",
+    "eslint": "^7.13.0",
     "html-minifier": "^4.0.0",
-    "jshint": "^2.11.1",
     "stylelint": "^13.6.1",
     "stylelint-config-standard": "^20.0.0",
     "terser": "^4.8.0"

validate_static

@@ -7,6 +7,6 @@ export PATH="$PWD/node_modules/.bin:$PATH"
 
 json_verify < static/manifest.webmanifest >/dev/null
 xmllint --noout static/**/*.@(html|svg|xml)
-jshint --verbose static/**/*.js
+eslint static/**/*.js
 stylelint static/**/*.css
 validatornu --Werror --also-check-css --also-check-svg static/**/*.@(css|html|svg)