Next.js reflection fails to destructure @Arg() decorator InputType variables

[redbaron76]

Describe the Bug
I don't understand if it's an issue related to TypeGraphQL or it involves some Babel plugins used to transpile my Next.js application. But when I use @Arg("input") { var1, var2 }: MyInputType as a single parameter in a @Mutation() method in a @Resolver() class and I try to inline destructure my Input type, TypeGraphQL reflection seems to crash with Cannot read property '0' of undefined.

To Reproduce
This is my method that generates the error (and my workaround to fix it):

@Resolver((of) => User)
export class UserResolver {
  
  .....

  @Mutation((returns) => User)
  async register(
    // @Arg("input") { firstName, lastName, email, password }: RegisterInput ---> ERROR!!!
    @Arg("input") registerInput: RegisterInput ---> IT WORKS
  ): Promise<User> {
    const { firstName, lastName, email, password } = registerInput;
    const hashedPassword = await bcrypt.hash(password, 12);

    const user = await User.create({
      firstName,
      lastName,
      email,
      password: hashedPassword,
    }).save();

    return user;
  }
}

.babelrc file in my Next.js project root

{
  "presets": ["next/babel"],
  "plugins": [
    "babel-plugin-transform-typescript-metadata",
    ["@babel/plugin-proposal-decorators", { "legacy": true }],
    "babel-plugin-parameter-decorator"
  ]
}

Expected Behavior
It should work as expected also destructuring variables from the incoming input type.

Environment

• OS: OSX 10.15.7 Catalina
• Node 10.22.0
• Package version 1.0.0
• TypeScript version 4.0.3

Additional Context

• Next.js 9.5.4
• TypeORM 0.2.28
• Postgres

[MichalLytek]

It's related to the babel plugin as it looks like the reflection plugin couldn't handle the destructuring syntax.

All the babel and JS discussion in happening in #55, so closing this one as duplicate 🔒