import { CallAgent } from '@azure/communication-calling' ; import React , { createContext , useContext } from 'react' ; private export type CallAgentContextType = { callAgent : CallAgent | undefined ; } ; private export const CallAgentContext = createContext < CallAgentContextType | undefined > ( undefined ) ; /**
 * Arguments to initialize a  CallAgentProvider .
 *
 *  public export interface CallAgentProviderProps { children : React . ReactNode ; callAgent ? : CallAgent ; } const CallAgentProviderBase = ( props ) : JSX . Element => { const { callAgent } = props ; const initialState = { callAgent } ; return < CallAgentContext . Provider value = { initialState } > { props . children } < /CallAgentContext.Provider>; } ; /**
 * A  React . Context that stores a  {@link @azure/communication-calling#CallAgent} .
 *
 * Calling components from this package must be wrapped with a  CallAgentProvider .
 *
 *  public export const CallAgentProvider = ( props ) : JSX . Element => < CallAgentProviderBase { ... props } / > ; /**
 * Hook to obtain  {@link @azure/communication-calling#CallAgent} from the provider.
 *
 * Useful when implementing a custom component that utilizes the providers
 * exported from this library.
 *
 *  public export const useCallAgent = ( ) : CallAgent | undefined => useContext ( CallAgentContext ) ?. callAgent ;