Understanding Effect and async code interaction

import { input } from "@inquirer/prompts";

// Get input text from user with Inquirer. `input` returns CancelablePromise<string>
const getInputAsync = (promptMessage: string) =>
  input({ message: promptMessage });

// String validation predicate
const checkIfIsLongerThan0 = (str: string): Boolean => str.length > 0;

const getInputUntilIsLongerThan0 = async (
  promptMessage: string
): Promise<string> => {
  const input = await getInputAsync(promptMessage);
  return checkIfIsLongerThan0(input)
    ? input
    : getInputUntilIsLongerThan0(promptMessage);
};

const mainAsyncWithoutEffect = async () => {
  const stringFromUser1 = await getInputUntilIsLongerThan0(
    "What's your user name?"
  );
  console.log(`Name: is ${stringFromUser1}`);

  const stringFromUser2 = await getInputUntilIsLongerThan0(
    "What's your email adress?"
  );
  console.log(`Email is: ${stringFromUser2}`);
};

mainAsyncWithoutEffect();