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 import axios from 'axios';
import * as jwt from 'jsonwebtoken';
import Action from 'routing-controllers';
import Connection from 'typeorm';

import env from '../env';

export function authorizationChecker( connection: Connection): (action: Action, roles: any) => Promise<boolean> | boolean 
 let validationKey: any = axios.get(env.auth.jwksUri).then(response => 
 validationKey = response.data.keys[0].value;
 ).catch();
 return async function innerAuthorizationChecker(
 action: Action,
 roles: string
 ): Promise<boolean> 
 // here you can use request/response objects from action
 // also if decorator defines roles it needs to access the actio
 // you can use them to provide granular access check
 // checker must return either boolean (true or false)
 // either promise that resolves a boolean value
 try 
 const token = (action.request.headers.token catch (e) 
 return false;
 
 ;

This is my error:

error: [app] Application is crashed: TypeError: self._callback.apply is not a function
(node:512) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): TypeError: Cannot read property '0' of undefined
(node:512) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js
process with a non-zero exit code.

I'm trying to get the validation key set from a specific URL from a service, but somehow (without calling the function) it says that the response data is undefined. On top of that, I'm having this error: self._callback.apply is not a function.

Has someone dealt with such a callback error before? I couldn't find anything on stackoverflow relating to my problem.