@salaros/is-biz-mail/tsconfig.node.json

isBizMail tells you whether a given email address is free (gmail.com, yahoo.es, yandex.ru etc) or not

{
  "compilerOptions": {
    "strict": false,
    "composite": true,
    "module": "ESNext",
    "moduleResolution": "Node",
    "forceConsistentCasingInFileNames": true
  },
}