assertObj.js

/**
 * Assert if objects are equal. This function also considers `not`
 * @return true if obj1 and obj2 are equal, otherwise false
 */
function _objEquals(obj1, obj2) {
  const keys1 = obj1.getOwnPropertyNames().sort(sortByCharCode),
        keys2 = obj2.getOwnPropertyNames().sort(sortByCharCode),
        sortByCharCode = function(key1, key2) {
          if (key1 < key2) {
            return -1;
          } else if (key1 > key2) {
            return 1;
          } else {
            return 0;
          }
        };
  //
  // Check keys are the same
  //
  if (keys1.length !== keys2.length) {
    return false;
  }
  keys1.forEach(function(element, i) {
  if (keys1[i] !== keys2[i]) {
      return false;
    }
  });

  //
  // Check values
  //
  for (const key of obj1.getOwnPropertyNames()) {
    const property1 = obj1[key],
          property2 = obj2[key];
    if (Array.isArray(property1)) {
      property1.forEach(function(element, i) {
        if (!this._objEquals(property1[i], property2[i])) {
          return false;
        }
      });
    } else if (typeof property1 === "object" && (property1.type === "not" || property2.type === "not")) {
      // Should NOT be equal
      if (property1.value === property2
        || property1 === property2.value
        || property1.value === property2.value
      ) {
        return false;
      }
    } else if (typeof property1 === "object") {
      if (!this._objEquals(property1, property2)) {
        return false;
      }
    } else {
      if (property1 !== property2) { // eslint-disable-line no-lonely-if
        return false;
      }
    }
  }

  return true;
}

See also: Node.js's assert.deepStrictEqual()