refactor: migrate development environment

eslint.config.js

@@ -0,0 +1,33 @@
+import { defineConfig } from "eslint/config";
+import globals from "globals";
+import js from "@eslint/js";
+import eslintConfigPrettier from "eslint-config-prettier/flat";
+import vitest from "@vitest/eslint-plugin";
+
+export default defineConfig([
+  eslintConfigPrettier,
+  js.configs.recommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.es2020,
+        ...globals.vitest,
+      },
+      ecmaVersion: 12,
+    },
+    rules: {
+      "no-console": "off",
+    },
+  },
+  {
+    files: ["tests/**"],
+    plugins: {
+      vitest,
+    },
+    rules: {
+      ...vitest.configs.recommended.rules,
+      "vitest/no-conditional-expect": "off",
+    },
+  },
+]);

index.js

@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-// eslint-disable-next-line import/extensions
+
 import cli from "./lib/cli.js";
 
 cli(process.argv.slice(2)).catch(console.error);

lib/cli.js

@@ -44,7 +44,6 @@ const onLoad = async (targetDir, version, argv) => {
     `${targetDir.replace(/\\/g, "/")}/**/.npmignore`,
   );
   await Promise.all(
-    // eslint-disable-next-line arrow-body-style
     npmIgnoreFiles.map((fileName) => {
       return fs.rename(
         fileName,
@@ -86,7 +85,7 @@ const onLoad = async (targetDir, version, argv) => {
       type: "input",
       name: "customLang",
       message: "Enter custom language code",
-      // eslint-disable-next-line
+
       when: ({ langChoice }) => !argv.lang && langChoice === langListOut[1],
     },
     {