normalizeEmail can break with quoted "@" in user part

[geoffreak]

When running normalizeEmail on email addresses that contain a quoted @ in the user part (which is legal and correctly identified by isEmail), it will return an invalid email address.

const validator = require('validator');

let email = '"test@example"@example.com';
console.log(validator.isEmail(email)); // true

let normalized = validator.normalizeEmail(email);
console.log(normalized); // "test@example"
console.log(validator.isEmail(normalized)); // false

Expected output for the last two lines:

console.log(normalized); // "test@example"@example.com
console.log(validator.isEmail(normalized)); // true

I would advise splitting the email in this fashion instead of assuming that a .split('@') would return an array of length 2:

let domainSplit = email.split('@');
let domain = domainSplit[domainSplit.length - 1];
let user = domainSplit.slice(0, domainSplit.length - 1).join('@');

[chriso]

Thanks for reporting.