TypeScript: get type of instance method of class

Question

I'm trying to get the type of an instance method of a class. Is there a built-in (better) way other than looking up the type in the prototype of the class?

class MyClass
{
    private delegate: typeof MyClass.prototype.myMethod; // gets the type ( boolean ) => number;

    public myMethod( arg: boolean )
    {
        return 3.14;
    }
}

Thanks in advance!

Answer 1

You could use TypeScript's built in InstanceType for that:

class MyClass
{
  private delegate: InstanceType<typeof MyClass>['myMethod']; // gets the type (boolean) => number;

  public myMethod( arg: boolean )
  {
    return 3.14;
  }
}