Update eslint config (#9457)

* Update eslint config

* Switch off max classes restriction
* Enforce tab indent, semicolon
* Warn when there exists unused vars

* Update change note

* Update change note

* Update change note

editions/tw5.com/tiddlers/releasenotes/5.4.0/leilei332-update-eslint-config.tid

@@ -0,0 +1,12 @@
+title: $:/changenotes/5.4.0/#9457
+description: Update eslint configuration
+release: 5.4.0
+tags: $:/tags/ChangeNote
+change-type: enhancement
+change-category: developer
+github-links: https://github.com/TiddlyWiki/TiddlyWiki5/pull/9457
+github-contributors: Leilei332
+
+* Enforce tab indentation, semicolon
+* Switch off `max-classes-per-file`
+* Show warning for unused variables

eslint.config.mjs

@@ -100,7 +100,7 @@ js.configs.recommended,
         "id-length": "off",
         "id-match": "error",
         "@stylistic/implicit-arrow-linebreak": "error",
-        "@stylistic/indent": "off",
+        "@stylistic/indent": ["error", "tab"],
         "init-declarations": "off",
         "@stylistic/jsx-quotes": "error",
         "@stylistic/key-spacing": "off",
@@ -121,7 +121,7 @@ js.configs.recommended,
         "@stylistic/lines-around-comment": "off",
         "@stylistic/lines-around-directive": "off",
         "@stylistic/lines-between-class-members": "error",
-        "max-classes-per-file": "error",
+        "max-classes-per-file": "off",
         "max-depth": "off",
         "@stylistic/max-len": "off",
         "max-lines": "off",
@@ -266,7 +266,7 @@ js.configs.recommended,
         "require-jsdoc": "off",
         "require-unicode-regexp": "off",
         "@stylistic/rest-spread-spacing": "error",
-        "@stylistic/semi": "off",
+        "@stylistic/semi": ["error", "always"],
         "@stylistic/semi-spacing": "off",
         "@stylistic/semi-style": "off",
         "sort-imports": "error",
@@ -293,7 +293,7 @@ js.configs.recommended,
         yoda: "off",
         // temporary rules
         "no-useless-escape": "off",
-        "no-unused-vars": "off",
+        "no-unused-vars": "warn",
         "no-empty": "off",
         "@stylistic/no-extra-semi": "off",
         "no-redeclare": "off",