Build a co-author commit trailer from just a GitHub username

getCoAuthorTrailer.js

/**
 * @param {string} username - GitHub username
 * @returns {string} Co-author commit trailer, using the user's noreply.github.com address
 */
const getCoAuthorTrailer = async username => {
  const response = await fetch(`https://api.github.com/users/${username}`);
  const { id, login, name } = await response.json();
  return `Co-authored-by: ${name || login} <${id}+${login}@users.noreply.github.com>`;
};