Custom Apollo/Graphql network interface

networkInterface.js

import { printAST } from 'apollo-client';
import Config from 'react-native-config';

const isConnected = true;

export default () => {
	return {
		async query(request) {
			if (!isConnected) {
				return new Promise.reject(new Error('no-connection'))
			} else {
				try {
					const response = await fetch(Config.API_URL, {
						headers: { Accept: 'application/json' },
						body: JSON.stringify({
							query: printAST(request.query),
							variables: JSON.stringify(request.variables || {}),
							debugName: JSON.stringify(request.debugName || ''),
							operationName: JSON.stringify(request.operationName || '')
						}),
						method: 'POST',
					});
					return await response.json();
				} catch (error) {
					return new Promise.reject(error);
				}
			}
		}
	}
};