React Native Context Function is 'not a function' - reactjs

Question

I'm attempting to import a function defined in a 'context' file so I can access the user data across the whole app easily.
When importing it, and calling it in my 'useEffect' however, it's claiming it isn't a function - when it clearly is.
For reference, here is the component which I'm calling the context function from:
import { Context } from '../context/authContext';
const LoadingScreen = ({ navigation }) => {
const { checkSignedIn } = useContext(Context)
useEffect(() => {
checkSignedIn()
}, [])
return (
<View style={styles.mainView}>
<ActivityIndicator style={styles.indicator} />
</View>
)
}
Here is the context file itself (in full):
import createDataContext from './createDataContext';
import { navigate } from '../navigationRef';
import { Magic } from '#magic-sdk/react-native';
const m = new Magic('API key');
const authReducer = (state, reducer) => {
switch (action.type) {
case 'checkComplete':
return { ...state, userDetails: action.payload };
default:
return state;
}
};
const checkSignedIn = dispatch => {
return async () => {
// Set variable which calls Magic to check if signed in
const checkMagic = await m.user.isLoggedIn();
// If user signed in, redirect to dashboard and save details in state
if (checkMagic === true) {
const { issuer, email } = await m.user.getMetaData();
dispatch({
type: 'checkComplete',
payload: [issuer, email]
});
navigate('authorisedFlow');
// If user not signed in, redirect to welcome page and set state as null
}
else {
navigate('loginFlow');
}
};
};
export const { Context, Provider } = createDataContext( authReducer, { checkSignedIn }, { userDetails: null } );
Here is the 'helper' function called 'createDataContext' which iterates over the dispatch and defines it without having to repeat create context code:
import React, { useReducer } from 'react';
export default (reducer, actions, defaultValue) => {
const Context = React.createContext();
const Provider = ({ children }) => {
const [state, dispatch] = useReducer(reducer, defaultValue);
const boundActions = {};
for (let key in actions) {
boundActions[key] = actions[key].dispatch;
}
return (
<Context.Provider value={{ state, ...boundActions }}>
{children}
</Context.Provider>
)
};
return { Context, Provider }
};
I don't think the navigate helper is necessary to show here, but happy to put in if needed. It seems to be more of a problem with the function itself!
If anybody can point out what I'm doing wrong here it'd be much appreciated!
Please let me know if any of that is unclear.