higher-order-reducers/lib/utils/sanity-check.js

A library of simple everyday reducer utility functions

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _warn = require('./warn');

var _warn2 = _interopRequireDefault(_warn);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var isReducer = function isReducer(reducer) {
  return typeof reducer === 'function';
};

var handlesUndefined = function handlesUndefined(reducer) {
  return reducer(undefined, { type: '@@PROBE' }) !== undefined;
};

var isSane = function isSane(reducer, context) {
  if (!isReducer(reducer)) {
    (0, _warn2.default)(context + '. Supplied reducer is not a function');
    return false;
  }
  if (!handlesUndefined(reducer)) {
    (0, _warn2.default)(context + '. Supplied reducer returned returned "undefined" for state undefined');
    return false;
  }
  return true;
};

exports.default = isSane;