TypeError: undefined is not an object in React

Question

I am beginner with React, do not know how to fix this, to get my first app up and running:

TypeError: undefined is not an object (evaluating 'react__WEBPACK_IMPORTED_MODULE_0__["PropTypes"].func')

Following this tutorial: Lynda - Building and Deploying a Full-Stack React Application. Googled the error message. I tried to add this line: import PropTypes from 'prop-types'; Apparently it did not help.

Along with the answer below: reactjs.org/docs/typechecking-with-proptypes.html — SakoBu
– SakoBu, Commented Aug 22, 2019 at 14:47

Dupocas · Accepted Answer · 2019-08-22 14:45:30Z

3

prop-types is a npm package and does not come in the default installation using create-react-app. It must be install using npm or yarn and imported like this

import PropTypes from 'prop-types'

answered Aug 22, 2019 at 14:45

Dupocas

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3 Comments

János Over a year ago

Hi! Thanks! Meantime I installed prop-types, but still when I put in import PropTypes from 'prop-types' i.e. in the index.js, it did not help but get warning: 'PropTypes' is defined but never used. What am I doing wrong?

Dupocas Over a year ago

You need to import where you're using. Inside InternalPropTypes.js

János Over a year ago

Hi! I am still stuck. Applied your suggestion, but I do not know what else I need to do: stackoverflow.com/questions/57671024/how-to-fix-proptypes-issue I do not found any InternalPropTypes.js file.

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