Add ESLint and StyleLint

.eslintrc.js

@@ -0,0 +1,73 @@
+module.exports = {
+    env: {
+        browser: true,
+        commonjs: true,
+        es2017: true,
+        node: true,
+    },
+    extends: [
+        "eslint:recommended",
+        "plugin:vue/vue3-recommended",
+    ],
+    parserOptions: {
+        ecmaVersion: 2018,
+        sourceType: "module",
+    },
+    rules: {
+        // override/add rules settings here, such as:
+        // 'vue/no-unused-vars': 'error'
+        indent: ["error", 4],
+        quotes: ["warn", "double"],
+        //semi: ['off', 'never'],
+        "vue/html-indent": ["warn", 4], // default: 2
+        "vue/max-attributes-per-line": "off",
+        "no-multi-spaces": ["error", {
+            ignoreEOLComments: true,
+        }],
+        "curly": "error",
+        "object-curly-spacing": ["error", "always"],
+        "object-curly-newline": ["error", {
+            "ObjectExpression": {
+                "minProperties": 1,
+            },
+            "ObjectPattern": {
+                "multiline": true,
+                "minProperties": 2,
+            },
+            "ImportDeclaration": {
+                "multiline": true,
+            },
+            "ExportDeclaration": {
+                "multiline": true,
+                //'minProperties': 2,
+            },
+        }],
+        "object-property-newline": "error",
+        "comma-spacing": "error",
+        "brace-style": "error",
+        "no-var": "error",
+        "key-spacing": "warn",
+        "keyword-spacing": "warn",
+        "space-infix-ops": "warn",
+        "arrow-spacing": "warn",
+        "no-trailing-spaces": "warn",
+        "space-before-blocks": "warn",
+        //'no-console': 'warn',
+        "no-extra-boolean-cast": "off",
+        "no-multiple-empty-lines": ["warn", {
+            "max": 1,
+            "maxBOF": 0,
+        }],
+        "lines-between-class-members": ["warn", "always", {
+            exceptAfterSingleLine: true,
+        }],
+        "no-unneeded-ternary": "error",
+        "no-else-return": ["error", {
+            "allowElseIf": false,
+        }],
+        "array-bracket-newline": ["error", "consistent"],
+        "eol-last": ["error", "always"],
+        //'prefer-template': 'error',
+        "comma-dangle": ["warn", "always-multiline"],
+    },
+}

.stylelintrc

@@ -0,0 +1,3 @@
+{
+  "extends": "stylelint-config-recommended",
+}

package.json

@@ -45,11 +45,16 @@
         "vue-toastification": "^2.0.0-rc.1"
     },
     "devDependencies": {
-        "@vitejs/plugin-legacy": "^1.4.4",
-        "@vitejs/plugin-vue": "^1.2.5",
+        "@vitejs/plugin-legacy": "^1.5.0",
+        "@vitejs/plugin-vue": "^1.3.0",
         "@vue/compiler-sfc": "^3.1.5",
         "core-js": "^3.15.2",
-        "sass": "^1.35.2",
-        "vite": "^2.4.2"
+        "eslint": "^7.31.0",
+        "eslint-plugin-vue": "^7.14.0",
+        "sass": "^1.36.0",
+        "stylelint": "^13.13.1",
+        "stylelint-config-recommended": "^5.0.0",
+        "stylelint-config-standard": "^22.0.0",
+        "vite": "^2.4.4"
     }
 }