Mutation return type Promise<boolean> not inferreed as boolean

[etudor]

Describe the bug
Promise not resolved in mutation and this error is produced:

Error: You need to provide explicit type for default_1#deleteOrder !

To Reproduce

  @Authorized()
  @Mutation()
  async deleteOrder(
    @Arg('id', type => Int) id: number
  ): Promise<boolean> {
    const order = await OrderRepository.findById(id)
    order.deletedAt = new Date()

    await OrderRepository.save(order)

    return true
  }

Expected behavior
The output of the mutation should be inferred as boolean from the return type

Logs
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You can paste the errors with stack trace that were printed when the error occured.

Enviorment (please complete the following information):

• OS: Docker on Windows
• Node: v13.6.0
• Package version: 0.17.5
• TypeScript version: 3.7.3

Additional context
Add any other context about the problem here.

[MichalLytek]

Duplicate of #296 🔒

[etudor]

@MichalLytek I agree this is duplicate. But I find it to be a bug and not an enhancement. Because Boolean is not a type in type-graphql how can I manually set the return type in my case?

@Mutation(returns => Boolean) ### this won't work

Is there a quick solution for this until the enhancement is added?

[MichalLytek]

@etudor this has to work

  @Mutation(returns => Boolean)
  async deleteOrder(
    @Arg('id', type => Int) id: number
  ): Promise<boolean> {}

https://typegraphql.com/docs/scalars.html#aliases