Requires Babel “7.0.0-0” but was loaded with “6.26.3”

by

Test which version you are running with cmd

babel -V

If it is not verion 7 or higher

npm uninstall babel-cli -g
npm uninstall babel-core -g

And 

npm install @babel/cli -g
npm install @babel/core -g

If you are using Jest run

npm install [email protected] --save-dev

Uninstall and reinstall @babel/node solves the problem if you do node development.

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