Cannot read properties of undefined (reading 'length') with @UploadedFile

[markusdostal]

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Expected Behavior

Current Behavior

In an express application I have an endpoint which expects form-data. Text fields and file fields are mixed.
Whenever I try to send a request to this endpoint I get the error in "expressTemplateService" which is shown below. This error has first shown up in version 6.1.0. Older releases of tsoa worked as expected.

As is shown below, i have a file with the name "avatar":

But to access the requestedFiles "username" is used, which is the name of a text field. This is why "fileArgs" is undefined and why the check of the length fails.

Possible Solution

Steps to Reproduce

Add an Endpoint like this:

@Put()
  public async updateUser(
    @FormField("username") username: string,
    @UploadedFile("avatar") avatar: File
  ): Promise<void> {
    console.log("username", username);
    console.log("avatar", avatar);
    return;
  }

an send a request to this endpoint with Postman

This should generate the following console output:

Example app listening at http://localhost:3000
TypeError: Cannot read properties of undefined (reading 'length')
    at D:\Tests\tsoa_test\node_modules\@tsoa\runtime\dist\routeGeneration\templates\express\expressTemplateService.js:59:41
    at Array.map (<anonymous>)
    at ExpressTemplateService.getValidatedArgs (D:\Tests\tsoa_test\node_modules\@tsoa\runtime\dist\routeGeneration\templates\express\expressTemplateService.js:32:44)
    at UsersController_updateUser (D:\Tests\tsoa_test\build\build\routes.js:99:45)
    at Layer.handle [as handle_request] (D:\Tests\tsoa_test\node_modules\express\lib\router\layer.js:95:5)
    at next (D:\Tests\tsoa_test\node_modules\express\lib\router\route.js:149:13)
    at done (D:\Tests\tsoa_test\node_modules\multer\lib\make-middleware.js:45:7)
    at indicateDone (D:\Tests\tsoa_test\node_modules\multer\lib\make-middleware.js:49:68)
    at Multipart.<anonymous> (D:\Tests\tsoa_test\node_modules\multer\lib\make-middleware.js:166:7)
    at Multipart.emit (node:events:518:28)

Context (Environment)

Version of the library: @tsoa/runtime: ^6.1.1 / @tsoa/cli: ^6.1.1
Version of NodeJS: v20.11.1

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Detailed Description

Breaking change?

[github-actions]

Hello there markusdostal 👋

Thank you for opening your very first issue in this project.

We will try to get back to you as soon as we can.👀