simple-deep-equal.js

/**
 * Simple deep equal function. Note that this expects a JSON-like config object;
 * it is not designed for anything more complex.
 *
 * @param {any} a
 * @param {any} b
 * @returns {boolean}
 */
export function deepEqual(a, b) {
  if (Object.is(a, b)) {
    return true;
  } else if (isObject(a) && isObject(b)) {
    if (Object.keys(a).length !== Object.keys(b).length) {
      return false;
    }

    for (let key in a) if (!deepEqual(a[key], b[key])) return false;

    return true;
  } else {
    return false;
  }
}

/**
 * @param {any} subject
 * @returns {boolean}
 */
export function isObject(subject) {
  return subject instanceof Object && subject !== null;
}