GraphQL upload files issue | NestJS | Page 1

As a newbie in NestJS + GraphQL, I'm having trouble with uploading files through GraphQL. I have such resolver:

@Mutation(() => Group)
  async sendMessageToGroup(
    @AuthToken() token: string,
    @Args('input') message: CreateMessageInput,
    @Args({ name: 'files', type: () => [UploadFileScalar], nullable: true })
    files?: FileUpload[],
  ) {
    const payload = this.tokenService.decodeToken(token);
    return this.messageService.sendMessageToGroup(
      { ...message, files: files },
      payload.sub,
    );
  }

UploadFileScalar class:

@Scalar('UploadFileScalar')
export class UploadFileScalar {
  description = 'File upload scalar type';

  parseValue(value: any): any {
    return value;
  }

  serialize(value: any): any {
    return value;
  }
  
  parseLiteral(ast: any): any {
    return ast.value;
  }
}

FileUpload interface:

export interface FileUpload {
  filename: string;
  mimetype: string;
  encoding: string;
  createReadStream(): ReadStream;
}

Since the apollo client doesn't support uploading files, I tried to do it through Altair, but I keep getting this error. I suppose, error is somehow related to the "Content-Type" header, which is set to "multipart/form-data" by default, but i don't see other options for this. Would be very grateful if someone could help solve this problem.

#GraphQL upload files issue