TS2353: Object literal may only specify known properties, and 'multiple' does not exist in type Field

[falk-stefan]

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Expected Behavior

As far as I am aware, I did not change anything on my end recently which could have caused this but today, all of a sudden, the TypeScript compiler is compalining about the generated routes.ts file.

Taking a look at an earlier version, I see that there's a difference in how the multer.Multer object gets used/updated:

Working version

        // WARNING: This file was auto-generated with tsoa. Please do not modify it. Re-run tsoa to re-generate this file: https://github.com/lukeautry/tsoa
        app.put('/api/user/image',
            authenticateMiddleware([{"bearerAuth":["guide:admin"]}]),
            upload.single('file'),
            ...(fetchMiddlewares<RequestHandler>(UserController)),
            ...(fetchMiddlewares<RequestHandler>(UserController.prototype.uploadUserImage)),

Offended version

        // WARNING: This file was auto-generated with tsoa. Please do not modify it. Re-run tsoa to re-g
        app.put('/api/user/image',                                                                      
            authenticateMiddleware([{"bearerAuth":["guide:admin"]}]),                                   
            upload.fields([{"name":"file","maxCount":1,"multiple":false}]),                             
            ...(fetchMiddlewares<RequestHandler>(UserController)),                                      
            ...(fetchMiddlewares<RequestHandler>(UserController.prototype.uploadUserImage)),            

The latter throws the following TS error:

TS2353: Object literal may only specify known properties, and 'multiple' does not exist in type Field

What I don't get here is that I can't see what exactly caused this issue. All deployments re-generate this file and, so far, there were no complaints from the compiler. Not sure what I changed on my end which is causing the issue all of a sudden.

Possibly related

#1651

[jackey8616]

@falk-stefan
v 6.5.0 is fired, you can give it a shot.

[falk-stefan]

@jackey8616 thank you for the hint!

Unfortunately, I am now getting a bunch of errors relating to annotations:

src/controller/user/user.controller.ts:14:1 - error TS1238: Unable to resolve signature of class decorator when called as an expression.
  The runtime will invoke the decorator with 1 arguments, but the decorator expects 3.

14 @Tags('User')
   ~~~~~~~~~~~~~

  node_modules/typescript/lib/lib.decorators.legacy.d.ts:21:52
    21 declare type MethodDecorator = <T>(target: Object, propertyKey: string | symbol, descriptor: TypedPropertyDescriptor<T>) => TypedPropertyDescriptor<T> | void;
                                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    An argument for 'propertyKey' was not provided.

src/controller/user/user.controller.ts:14:2 - error TS1270: Decorator function return type 'void | TypedPropertyDescriptor<unknown>' is not assignable to type 'void | typeof UserController'.
  Type 'TypedPropertyDescriptor<unknown>' is not assignable to type 'void | typeof UserController'.

14 @Tags('User')
    ~~~~~~~~~~~~

This is what my tsconfig.json looks like:

{
  "compilerOptions": {
    "target": "es2022",
    "module": "NodeNext",
    "moduleResolution": "NodeNext",
    "rootDir": "./src",
    "sourceMap": true,
    "outDir": "./dist",
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "noImplicitAny": false,
    "skipLibCheck": true,
    "allowJs": true,
    "checkJs": false,
    "experimentalDecorators": true
  },
  "include": [
    "src/**/*.ts",
    "src/**/*.js"
  ],
  "exclude": [
    "node_modules"
  ]
}

I tried to play arround by setting

"emitDecoratorMetadata": true,
"experimentalDecorators": true

but none of the settings would work.

[jackey8616]

@falk-stefan
we will track this issue at #1702 .

[falk-stefan]

@jackey8616 thank you 👍

[jackey8616]

@falk-stefan
The 6.5.1 is released, can you check it out?
If everything is okay, then we will close this issue soon.

[falk-stefan]

@jackey8616 I gave it a quick test. Looks good so far. I war able to create a local build. Looks good 👍