Added a check to see if export target folder is empty

CHANGELOG.md

@@ -1 +1,2 @@
+- Fixed an issue where `emulators:export` did not check if the target folder is empty. (#6313)
 - Fix "Could not find the next executable" on Next.js deployments (#6372)

src/emulator/controller.ts

@@ -34,7 +34,7 @@ import { LoggingEmulator } from "./loggingEmulator";
 import * as dbRulesConfig from "../database/rulesConfig";
 import { EmulatorLogger } from "./emulatorLogger";
 import { EmulatorHubClient } from "./hubClient";
-import { promptOnce } from "../prompt";
+import { confirm } from "../prompt";
 import {
   FLAG_EXPORT_ON_EXIT_NAME,
   JAVA_DEPRECATION_WARNING,
@@ -961,17 +961,19 @@ export async function exportEmulatorData(exportPath: string, options: any, initi
 
   // Check if there is already an export there and prompt the user about deleting it
   const existingMetadata = HubExport.readMetadata(exportAbsPath);
-  if (existingMetadata && !(options.force || options.exportOnExit)) {
+  const isExportDirEmpty = fs.readdirSync(exportAbsPath).length === 0;
+  if ((existingMetadata || !isExportDirEmpty) && !(options.force || options.exportOnExit)) {
     if (options.noninteractive) {
       throw new FirebaseError(
         "Export already exists in the target directory, re-run with --force to overwrite.",
         { exit: 1 }
       );
     }
 
-    const prompt = await promptOnce({
-      type: "confirm",
-      message: `The directory ${exportAbsPath} already contains export data. Exporting again to the same directory will overwrite all data. Do you want to continue?`,
+    const prompt = await confirm({
+      message: `The directory ${exportAbsPath} is not empty. Existing files in this directory will be overwritten. Do you want to continue?`,
+      nonInteractive: options.nonInteractive,
+      force: options.force,
       default: false,
     });