Mutually recursive modules

even.js

import odd from './odd';

export default function even(n) {
  if (n === 0) {
    return true;
  }
  return !odd(n - 1);
}

odd.js

import even from './even';

export default function odd(n) {
  if (n === 0) {
    return true;
  }
  return !even(n - 1);
}

test.js

import even from './even';

console.log(even(5));