How do you add a link to CodePen?

#How to Add an External Resource Click the gear in the upper left corner of the JS or CSS editor . You’ll see the options pane for that editor. There is a text input where you can add the URL for your resource. If you don’t have a URL to add, you can use our resource search to find the library you need.

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Why React is not defined?

To fix the ‘Uncaught ReferenceError: React is not defined’ error when developing React apps, we can add the ‘react’ property to the externals property in webpack. config. json . Also, we can add import React from ‘react’; to the top of each component file to fix the error.

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