feat: add javascript linter format

eslint.config.mjs

@@ -0,0 +1,49 @@
+import { defineConfig, globalIgnores } from 'eslint/config'
+import globals from 'globals'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import js from '@eslint/js'
+import { FlatCompat } from '@eslint/eslintrc'
+
+const __filename = fileURLToPath(import.meta.url)
+const __dirname = path.dirname(__filename)
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all
+})
+
+export default defineConfig([globalIgnores([
+  'node_modules',
+  'client/lib'
+]), {
+  extends: compat.extends('airbnb-base'),
+
+  languageOptions: { ecmaVersion: 13 },
+
+  rules: {
+    semi: ['error', 'never'],
+
+    'max-len': ['error', { code: 104 }],
+
+    'vars-on-top': 'off',
+    'class-methods-use-this': 'off',
+    'import/no-unresolved': 'off',
+    'import/extensions': ['error', 'always'],
+    'import/prefer-default-export': ['off'],
+    'no-use-before-define': ['off'],
+    eqeqeq: ['error', 'smart'],
+    'comma-dangle': ['error', 'never'],
+
+    'object-curly-newline': ['error', { multiline: true }],
+
+    'func-names': ['error', 'never'],
+    'space-before-function-paren': ['error', 'never'],
+
+    'lines-between-class-members': ['error', 'always', { exceptAfterSingleLine: true }],
+
+    'no-new': 'off',
+    'no-restricted-syntax': 'off',
+    'guard-for-in': 'off'
+  }
+}])