Can not process upload of 2 files with @tsed/platform-multer

[AlexDede]

Describe the bug

The code below works fine with @tsed/* version of 8.6.0 but has problems after migration to version 8.7.0 and @tsed/platform-multer

To Reproduce

1. create a controller like this

import {Controller} from '@tsed/di';
import {MultipartFile, type PlatformMulterFile} from '@tsed/platform-multer';
import {Description, Post, Returns} from '@tsed/schema';

@Controller('/api/1.0')
export class MyController {

    @Returns(201)
    @Post('/test')
    @Description('Upload files')
    public async uploadFiles(@MultipartFile('file1') file1: PlatformMulterFile, @MultipartFile('file2') file2: PlatformMulterFile): Promise<void> {
    // some logic here
    }

}

2. try to call this API from Postman or unit test
3. The error will thrown:

Error: Unexpected end of form
    at Multipart._final (/Users/Work/Projects/test/node_modules/busboy/lib/types/multipart.js:588:17)
    at prefinish (node:internal/streams/writable:916:14)
    at finishMaybe (node:internal/streams/writable:930:5)
    at Multipart.Writable.end (node:internal/streams/writable:845:5)
    at onend (node:internal/streams/readable:948:10)
    at processTicksAndRejections (node:internal/process/task_queues:85:11) {
  storageErrors: []
}

Expected behavior

The server should process 2 files without any error

OS

MacOS

Node version

Node 22.14.0

Library version

8.7.0

Additional context

If the code above will be changed to

public async uploadFiles(@MultipartFile('files') files: PlatformMulterFile[]): Promise<void> {
    // some logic here
}

Everything will work fine. But this is not acceptable for my API.

[Romakita]

Haaa I see where the problem is. I haven’t this usecase in the integration test. When you use decorator twice, multer will be added twice, but to work, multer must be added only one time. I’ll fix that!

Thanks @AlexDede for the feedback.