feat: prevent overwriting non-empty directories

Author: morinokami

packages/cta-cli/src/options.ts

@@ -1,4 +1,5 @@
-import { intro } from '@clack/prompts'
+import fs from 'node:fs'
+import { cancel, intro } from '@clack/prompts'
 
 import {
   finalizeAddOns,
@@ -42,6 +43,15 @@ export async function promptForCreateOptions(
   options.framework = getFrameworkById(cliOptions.framework || 'react-cra')!
 
   options.projectName = cliOptions.projectName || (await getProjectName())
+  if (
+    fs.existsSync(options.projectName) &&
+    fs.readdirSync(options.projectName).length > 0
+  ) {
+    cancel(
+      `The directory ${options.projectName} is not empty. Please choose a different project name.`,
+    )
+    process.exit(1)
+  }
 
   // Router type selection
   if (forcedMode) {

packages/cta-cli/src/ui-prompts.ts

@@ -16,7 +16,6 @@ import {
 import type { AddOn, PackageManager } from '@tanstack/cta-engine'
 
 import type { Framework } from '@tanstack/cta-engine/dist/types/types.js'
-import { InitialData } from '../../cta-ui/src/types'
 
 export async function getProjectName(): Promise<string> {
   const value = await text({