Repro

App.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 *
 * @format
 * @flow
 */

import React, { useEffect } from 'react';
import {
  SafeAreaView,
  StyleSheet,
  ScrollView,
  View,
  Text,
  StatusBar,
} from 'react-native';

import {
  Header,
  LearnMoreLinks,
  Colors,
  DebugInstructions,
  ReloadInstructions,
} from 'react-native/Libraries/NewAppScreen';

import AWSAppSyncClient from 'aws-appsync'
import AppSyncConfig from './aws-exports' 

import graphql from 'graphql-tag';

import { listTodos } from './src/graphql/queries';

import { createTodo } from './src/graphql/mutations';

const client = new AWSAppSyncClient({
  url: AppSyncConfig.aws_appsync_graphqlEndpoint,
  region: AppSyncConfig.aws_appsync_region,
  auth: {
    type: AppSyncConfig.aws_appsync_authenticationType,
    apiKey: AppSyncConfig.aws_appsync_apiKey,
    // jwtToken: async () => token, // Required when you use Cognito UserPools OR OpenID Connect. token object is obtained previously
  }
})

const App: () => React$Node = () => {

  useEffect(()=>{
    client.query({
      query: graphql(listTodos),
      variables: {
        limit: 100
      }
    }).then( (c) => {
      console.log(`items: `, c.data.listTodos.items);
    })

    // client.mutate({
    //   mutation: graphql(createTodo),
    //   //fetchPolicy: 'cache-and-network',
    //   variables: {
    //     input: {
    //       name: 'Use AppSync',
    //       description: 'Realtime and Offline',
    //     }
    //   }
    // }).then( (res) => {
    //   console.log(`DATA:`, res);
    // });
    
  }, []);

  return (
    <>
      <StatusBar barStyle="dark-content" />
      <SafeAreaView>
        <ScrollView>
          <Text>
          Hello
          </Text>
        </ScrollView>
      </SafeAreaView>
    </>
  );
};

const styles = StyleSheet.create({
  scrollView: {
    backgroundColor: Colors.lighter,
  },
  engine: {
    position: 'absolute',
    right: 0,
  },
  body: {
    backgroundColor: Colors.white,
  },
  sectionContainer: {
    marginTop: 32,
    paddingHorizontal: 24,
  },
  sectionTitle: {
    fontSize: 24,
    fontWeight: '600',
    color: Colors.black,
  },
  sectionDescription: {
    marginTop: 8,
    fontSize: 18,
    fontWeight: '400',
    color: Colors.dark,
  },
  highlight: {
    fontWeight: '700',
  },
  footer: {
    color: Colors.dark,
    fontSize: 12,
    fontWeight: '600',
    padding: 4,
    paddingRight: 12,
    textAlign: 'right',
  },
});

export default App;

mutations.js

/* eslint-disable */
// this is an auto generated file. This will be overwritten

export const createTodo = `mutation CreateTodo(
  $input: CreateTodoInput!
  $condition: ModelTodoConditionInput
) {
  createTodo(input: $input, condition: $condition) {
    id
    name
    description
  }
}
`;
export const updateTodo = `mutation UpdateTodo(
  $input: UpdateTodoInput!
  $condition: ModelTodoConditionInput
) {
  updateTodo(input: $input, condition: $condition) {
    id
    name
    description
  }
}
`;
export const deleteTodo = `mutation DeleteTodo(
  $input: DeleteTodoInput!
  $condition: ModelTodoConditionInput
) {
  deleteTodo(input: $input, condition: $condition) {
    id
    name
    description
  }
}
`;

package.json

{
  "name": "repro",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "android": "react-native run-android",
    "ios": "react-native run-ios",
    "start": "react-native start",
    "test": "jest",
    "lint": "eslint ."
  },
  "dependencies": {
    "@react-native-community/netinfo": "4",
    "aws-appsync": "2.0.0",
    "graphql-tag": "^2.10.3",
    "react": "16.9.0",
    "react-native": "0.61.5"
  },
  "devDependencies": {
    "@babel/core": "^7.6.2",
    "@babel/runtime": "^7.6.2",
    "@react-native-community/eslint-config": "^0.0.5",
    "babel-jest": "^24.9.0",
    "eslint": "^6.5.1",
    "jest": "^24.9.0",
    "metro-react-native-babel-preset": "^0.56.0",
    "react-test-renderer": "16.9.0"
  },
  "jest": {
    "preset": "react-native"
  }
}

queries.js

export const getTodo = `query GetTodo($id: ID!) {
  getTodo(id: $id) {
    id
    name
    description
  }
}
`;
export const listTodos = `query ListTodos(
  $filter: ModelTodoFilterInput
  $limit: Int
  $nextToken: String
) {
  listTodos(filter: $filter, limit: $limit, nextToken: $nextToken) {
    items {
      id
      name
      description
    }
  }
}
`;

schema

type Todo @model {
  id: ID!
  name: String!
  description: String
}