Function useCallback

test/neverland.js:517–521

(fn, guards)

    return stack[i].current;
  };
  var useCallback = function useCallback(fn, guards) {
    return useMemo(function () {
      return fn;
    }, guards);
  };

  /*! (c) Andrea Giammarchi - ISC */
  var useReducer = function useReducer(reducer, value, init, options) {