Add .eslintrc.json

And fix issues

.eslintrc.json

@@ -0,0 +1,24 @@
+{
+    "root": true,
+    "env": {
+        "es2022": true,
+        "browser": true
+    },
+    "parserOptions": {
+        "ecmaVersion": 2022,
+        "sourceType": "module"
+    },
+    "extends": "eslint:recommended",
+    "rules": {
+        "semi": ["error", "never"],
+        "indent": ["warn", 4, { "flatTernaryExpressions": true, "SwitchCase": 1 }],
+        "quotes": ["warn", "single"],
+        "comma-dangle": ["warn", "always-multiline"],
+        "no-trailing-spaces": "warn",
+        "no-unused-vars": "warn",
+        "no-console": ["warn", { "allow": ["debug", "warn", "error", "assert"] }],
+        "no-constant-condition": ["error", { "checkLoops": false }],
+        "no-empty": ["error", { "allowEmptyCatch": true }]
+    },
+    "reportUnusedDisableDirectives": true
+}

fb2.js

@@ -248,7 +248,7 @@ export const makeFB2 = async blob => {
         modified: getDate($('document-info date')),
         description: annotation ? converter.convert(annotation,
             { annotation: ['div', SECTION] }).innerHTML : null,
-        subject: $$('title-info genre').map(getElementText)
+        subject: $$('title-info genre').map(getElementText),
     }
     book.getCover = () => fetch(getImageSrc($('coverpage image')))
         .then(res => res.blob())

reader.js

@@ -176,7 +176,7 @@ class Reader {
                     this.layout.flow = value
                     this.setAppearance()
                 },
-            }
+            },
         ])
         menu.element.classList.add('menu')