Package update

.prettierrc

@@ -0,0 +1,8 @@
+{
+  "printWidth": 100,
+  "trailingComma": "es5",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": true,
+  "endOfLine": "lf"
+}

eslint.config.mjs

@@ -0,0 +1,23 @@
+import globals from 'globals';
+import pluginJs from '@eslint/js';
+import pluginReact from 'eslint-plugin-react';
+
+export default [
+  { files: ['**/*.{js,mjs,cjs,jsx}'] },
+  { languageOptions: { globals: globals.browser } },
+  pluginJs.configs.recommended,
+  pluginReact.configs.flat.recommended,
+  {
+    settings: {
+      react: {
+        version: 'detect',
+      },
+    },
+  },
+  {
+    rules: {
+      'react/react-in-jsx-scope': 'off', // React v18では不要
+      'react/prop-types': 'off', //prop-typesは使用していないのでoff
+    },
+  },
+];