npmコマンドがSyntaxError…{

http://shuzo-kino.hateblo.jp/entry/2015/06/13/233720

Module not found: Error: Can't resolve …パス通ってるのに！

https://qiita.com/toris-birds/items/c0874a66865f7e3a09ee

expected a string (for built-in components) or a class/function (for composite components) but got: undefined.　Import Export　関係

https://teratail.com/questions/100553
型がreact.elementでないとはかれるエラー

react.development.jsの以下の行でブレークポイントはるとタイプおかしいやつ捕まえられる。

react.development.js

function createElementWithValidation(type, props, children) {
  var validType = isValidElementType(type);//*************ここで型のチェックしてる

  // We warn in this case but don't throw. We expect the element creation to
  // succeed and there will likely be errors in render.
  if (!validType) {     //*************ここが捕まえやすい
    var info = '';
    if (type === undefined || typeof type === 'object' && type !== null && Object.keys(type).length === 0) {
      info += ' You likely forgot to export your component from the file ' + "it's defined in, or you might have mixed up default and named imports.";
    }

npmコマンドがSyntaxError…{

Module not found: Error: Can't resolve …パス通ってるのに！

expected a string (for built-in components) or a class/function (for composite components) but got: undefined. Import Export 関係

reduserの分割問題について

expected a string (for built-in components) or a class/function (for composite components) but got: undefined.　Import Export　関係