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You can specify the result type generically in Typescript by using a generic type parameter.

For example, let's say you have a function that returns an array of a certain type:

function toArray<T>(arg: T): T[] {
  return [arg];
}

In this example, the function takes in a generic argument arg and returns an array of T type.

You can also specify the generic type parameter when calling the function, like so:

const myArray = toArray<number>(42);

In this case, myArray will be of type number[], since we specified the generic type parameter as number.

By using generic type parameters, you can make your functions more flexible and reusable, since they can work with different types of data.