Answers for "cannot read property of undefined (reading 'push') react"

cannot read property of undefined (reading 'push') react

import { useHistory } from "react-router-dom";

  let history = useHistory();

history.push('/asdfg')

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TypeError: Cannot read property 'push' of undefined npm

const router = express.Router();
// 'express.Router()' must have parenthesis, will throw errors w/o