可能性のある未処理プロミス拒否（ID：0）：ReferenceError：変数を見つけることができません：エラー

Question

フェッチ要求が正常に動作し、データを返しますが、未処理の約束拒否警告も発生します。私は要求の最後にcatchを追加し、catch関数はいくつかのデータを返しますが、警告は消え去っていないようです。それはまた、参照エラーと言うと、変数エラーを見つけることができない、私はどの変数を参照して理解していない。私はリソースを調べましたが、通常は処理されていない約束の拒否はキャッチがないか、キャッチが何も返されないことがわかりましたが、フェッチ要求には両方があります。ここで

は私の要求フェッチである：ここでは

fetch(this.request) 
    .then(response => response.json()) 
    .then(response => { 

     if(response.token === null){ 
      return { 
       status:false, 
       message:"Incorrect login credentials", 
       token:response.token 
      } 
     } 

     return { 
      status:true, 
      message:"Login successful" 
     } 
    }, 
    reject => ({ 
     status:false, 
     message:"Something is wrong with the server in reject", 
     reject:reject 
    })) 
    .catch(networkError => ({ 
     status:false, 
     message:"Something is wrong with the server in catch", 
     networkError 
    })) 

をエラーログです：

Possible Unhandled Promise Rejection (id: 0): 
ReferenceError: Can't find variable: error 
_callee$@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:87622:38 
tryCatch@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:13836:44 
invoke@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:14024:30 
http://192.168.2.102:19001/./node_modules/react-native-scripts/build/bin/crna- 
entry.bundle?platform=android&dev=true&hot=false&minify=false:13861:28 
tryCatch@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:13836:44 
invoke@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:13894:28 
http://192.168.2.102:19001/./node_modules/react-native-scripts/build/bin/crna- 
entry.bundle?platform=android&dev=true&hot=false&minify=false:13902:19 
tryCallOne@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:15825:14 
http://192.168.2.102:19001/./node_modules/react-native-scripts/build/bin/crna- 
entry.bundle?platform=android&dev=true&hot=false&minify=false:15911:25 
http://192.168.2.102:19001/./node_modules/react-native-scripts/build/bin/crna- 
entry.bundle?platform=android&dev=true&hot=false&minify=false:6735:24 
_callTimer@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:6649:15 
callImmediatesPass@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:6877:19 
callImmediates@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:6888:39 
__callImmediates@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:6248:30 
http://192.168.2.102:19001/./node_modules/react-native-scripts/build/bin/crna- 
entry.bundle?platform=android&dev=true&hot=false&minify=false:6134:32 
__guard@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:6234:11 
flushedQueue@http://192.168.2.102:19001/./node_modules/react-native- 
scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:6133:19 
flushedQueue@[native code] 
callFunctionReturnFlushedQueue@http://192.168.2.102:19001/./node_modules/react 
-native-scripts/build/bin/crna-entry.bundle? 
platform=android&dev=true&hot=false&minify=false:6103:31 
callFunctionReturnFlushedQueue@[native code] 

Answer 1

fetch(this.request) 
    .then(response => response.json()) 
    .then(response => { 

     if(response.token === null){ 
      return({ 
       status:false, 
       message:"Incorrect login credentials", 
       token:response.token 
      }); 
     } 

     return({ 
      status:true, 
      message:"Login successful" 
     }); 
    }) 
    .catch(networkError => (
    return(
    { 
     status:false, 
     message:"Something is wrong with the server in catch", 
     networkError 
    } 
    ) 
    )) 

ブラケットを開閉するには、いくつかの浮き沈みがあるかもしれません。