Generic type inference from parameter/object without function

I have a generic type:

type Alpha<T> = {
  enabled: boolean;
  params: T;
};

I want to create a variable like so:

const alpha: Alpha = {
  enabled: true,
  params: {
    title: "hello",
  },
};

But that won’t work because Alpha expects a type as argument. However, my whole point here is that I would like it to be infered directly.

Of course I could use a function like that:

const createA = <T>(params: T): Alpha<T> => {
  return {
    enabled: true,
    params,
  };
};

const beta = createA({ funny: "title" });

But I would like to avoid having to create a function to do that. Is that doable ?

>Solution :

TL;DR;
No, it’s not doable.

Currently, there is no ideal way other than a dummy generic function to infer the type correctly. The only valid option without a function would be to manually pass the generic parameter to the type:

const alpha: Alpha<{title: string}> = {
  enabled: true,
  params: {
    title: "hello",
  },
};