Strict deep compare javascript objects.

compare.js

function compare(a,b) {
  if (typeof a != typeof b) return false;
  function compareObjects(a, b) {
    const ka = Object.keys(a);
    const kb = Object.keys(b);
    if (ka.length != kb.length) return false;
    for (let k of ka) {
      if (!(k in b) || !compare(a[k], b[k])) return false;
    }
    return true;
  }
  function compareArrays(a, b) {
    if (a.length != b.length) return false;
    for (let i = 0; i < a.length; i++) {
      if (!compare(a[i], b[i])) return false;
    }
  }
  if (Array.isArray(a) && Array.isArray(b)) {
    return compareArrays(a, b);
  }
  if (typeof a == "object") {
    return compareObjects(a, b);
  }
  return Object.is(a, b);
}