When you encounter an error saying ‘ReactDOM’ is not defined, it means that your application is can’t find the variable ReactDOM because it hasn’t been initialized yet . Generally, “X is not defined error” is caused by wrong import and different letter case between import and the imported variable call.16 Eki 2020
Read moreWhy is ReactDOM undefined?
When you encounter an error saying ‘ReactDOM’ is not defined, it means that your application is can’t find the variable ReactDOM because it hasn’t been initialized yet . Generally, “X is not defined error” is caused by wrong import and different letter case between import and the imported variable call.16 Eki 2020
Read moreHow do I import React into CodePen?
You can import React (any pretty much any other npm package) from Skypack like this: import React from “https://cdn.skypack.dev/[email protected]”; CodePen will help you fix imports like that automatically. You’ll see an icon like this come up, which you click to open and are offered a button to click to fix the issue.
Read moreHow do I import CodePen?
Simply drag-and-drop CSS, JS, or preprocessor versions of those files onto the Assets area and they will upload . Then click the file name to get the URL and copy-and-paste it into external resources.
Read moreHow do I run JavaScript on CodePen?
How to run code in CodePen
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