Challenge 2 — Solution

Task: Write the contents of a file validator.js with a default
export — a function isValidEmail(email) doing a simple check for
the presence of "@" and ".". Then write main.js importing it under
the name checkEmail (a different name than it was defined with) and
testing it with two example strings.

// validator.js
export default function isValidEmail(email) {
    return email.includes('@') && email.includes('.');
}


// main.js
import checkEmail from './validator.js';

console.log(checkEmail("philip@example.com"));
console.log(checkEmail("not-an-email"));


Expected output:

true
false


Notes:
- Even though the function was defined as isValidEmail in
  validator.js, importing it as checkEmail works perfectly — a
  default export has no fixed name on the importing side, unlike a
  named export, which must be imported using its exact original name.
- includes() (a String method) checks whether a substring appears
  anywhere in the string — this is intentionally a very simple
  validity check, not real email validation.
- Only ONE default export is allowed per file — trying to add a
  second "export default" in validator.js would be a syntax error.