Uncaught TypeError: _react2.default.createContext is not a function


question is caused by react version, update your react version, it will be ok.

use "npm update react" and ""npm update react-dom""

//before:

"react": "^16.2.0",
"react-dom": "^16.2.0",
 
//after update:
 
"react": "^16.7.0",
"react-dom": "^16.7.0",


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