Function deepMerge

packages/styletron-react/src/index.tsx:582–596

(a, b)

}

function deepMerge(a, b) {
  const result = assign({}, a);

  for (const key in b) {
    const val = b[key];

    if (isObject(val) && isObject(a[key])) {
      result[key] = deepMerge(a[key], val);
    } else {
      result[key] = val;
    }
  }

  return result;
}

function shallowMerge(a, b) {
  return assign(assign({}, a), b);