Cannot read property 'history' of undefined (useHistory hook of React Router 5)

问题

I am using the new useHistory hook of React Router, which came out a few weeks ago. My React-router version is 5.1.2. My React is at version 16.10.1. You can find my code at the bottom.

Yet when I import the new useHistory from react-router, I get this error:

Uncaught TypeError: Cannot read property 'history' of undefined

which is caused by this line in React-router

function useHistory() {
  if (process.env.NODE_ENV !== "production") {
    !(typeof useContext === "function") ? process.env.NODE_ENV !== "production" ? invariant(false, "You must use React >= 16.8 in order to use useHistory()") : invariant(false) : void 0;
  }

  return useContext(context).history; <---------------- ERROR IS ON THIS LINE !!!!!!!!!!!!!!!!!
}

Since it is related to useContext and perhaps a conflict with context is at fault, I tried completely removing all calls to useContext, creating the provider, etc. However, that did nothing. Tried with React v16.8; same thing. I have no idea what could be causing this, as every other feature of React router works fine.

***Note that the same thing happens when calling the other React router hooks, such as useLocation or useParams.

Has anyone else encountered this? Any ideas to what may cause this? Any help would be greatly appreciated, as I found nothing on the web related to this issue.

import React, {useEffect, useContext} from 'react';
import { BrowserRouter as Router, Route, Link } from "react-router-dom";
import { Switch, useHistory } from 'react-router'
import { useTranslation } from 'react-i18next';

import lazyLoader from 'CommonApp/components/misc/lazyLoader';
import {AppContext} from 'CommonApp/context/context';

export default function App(props) {
    const { i18n } = useTranslation();
    const { language } = useContext(AppContext);
    let history = useHistory();

    useEffect(() => {
        i18n.changeLanguage(language);
    }, []);

    return(
        <Router>
            <Route path="/">
                <div className={testClass}>HEADER</div>
            </Route>
        </Router>
    )
}

回答1:

Its because the react-router context isn't set in that component. Since its the <Router> component that sets the context you could use useHistory in a sub-component, but not in that one.

回答2:

Note to other people that run into this problem and already have wrapped the component with Router component. Make sure that Router and the useHistory hook are imported from the same package. The same error can be thrown when one of them are imported from react-router and the other one from react-router-dom and the package versions of those packages don't match. Don't use both of them, read about the difference here.

回答3:

I updated my react-router-dom from 5.0.0 to ^5.1.2 and it's been solved. You may notice that the useHistory is in a sub-component.

来源：https://stackoverflow.com/questions/58220995/cannot-read-property-history-of-undefined-usehistory-hook-of-react-router-5