@20minutes/draft-convert/esm/util/accumulateFunction.js

Extensibly serialize & deserialize Draft.js ContentState

export default (function (newFn, rest) {
  return function () {
    var newResult = newFn.apply(void 0, arguments);
    if (newResult !== undefined && newResult !== null) {
      return newResult;
    }
    return rest.apply(void 0, arguments);
  };
});