feat: prevent overwriting non-empty directories

packages/cta-cli/src/cli.ts

@@ -373,6 +373,11 @@ Remove your node_modules directory and package lock file and re-install.`,
       '--add-on-config <config>',
       'JSON string with add-on configuration options',
     )
+    .option(
+      '-f, --force',
+      'force project creation even if the target directory is not empty',
+      false,
+    )
 
   program.action(async (projectName: string, options: CliOptions) => {
     if (options.listAddOns) {

packages/cta-cli/src/options.ts

@@ -1,4 +1,5 @@
-import { intro } from '@clack/prompts'
+import fs from 'node:fs'
+import { cancel, confirm, intro, isCancel } from '@clack/prompts'
 
 import {
   finalizeAddOns,
@@ -42,6 +43,21 @@ export async function promptForCreateOptions(
   options.framework = getFrameworkById(cliOptions.framework || 'react-cra')!
 
   options.projectName = cliOptions.projectName || (await getProjectName())
+  if (
+    !cliOptions.force &&
+    fs.existsSync(options.projectName) &&
+    fs.readdirSync(options.projectName).length > 0
+  ) {
+    const shouldContinue = await confirm({
+      message: `Target directory ${options.projectName} is not empty. Do you want to continue?`,
+      initialValue: true,
+    })
+
+    if (isCancel(shouldContinue) || !shouldContinue) {
+      cancel('Operation cancelled.')
+      process.exit(0)
+    }
+  }
 
   // Router type selection
   if (forcedMode) {

packages/cta-cli/src/types.ts

@@ -21,4 +21,5 @@ export interface CliOptions {
   interactive?: boolean
   ui?: boolean
   addOnConfig?: string
+  force?: boolean
 }

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({