需要帮助弄清楚如何写有条件的承诺

Question

这就是我想要做的

isAuthorized(params){
  return new Promise(function(resolve, reject) {
    if(params.property){
       doSomething().then(function(e){
         if(e){
            resolve(true);
         } else {
           reject(false);
         }
    } else {
      doSomethingElse().then(function(e){
         if(e){
            resolve(true);
         } else {
           reject(false);
         }
    }
}

但我收到警告："a promise was created at handler but was not returned from" 而函数按预期运行。

我也试过了

isAuthorized(params){
  if(params.property){
    return new Promise(function(resolve, reject) {
       doSomething().then(function(e){
         if(e){
            resolve(true);
         } else {
           reject(false);
         }
    });
  } else {
    return new Promise(function(resolve, reject) {
      doSomethingElse().then(function(e){
         if(e){
            resolve(true);
         } else {
           reject(false);
         }
    });
  }
}

如果您需要更多信息，请告诉我.. 谢谢 :)

Answer 1

https://github.com/petkaantonov/bluebird/blob/master/docs/docs/warning-explanations.md#warning-a-promise-was-created-in-a-handler-but-was-not-returned-from-it

这是在抱怨你没有在任何地方返回内在的 doSomething() 承诺。要避免 promise-callback anti-pattern，请尝试这样的操作：

function isAuthorized(params) {
  function resolveIfTruthy(e) {
    if (e) return Promise.resolve(true);
    else return Promise.reject(false);
  }
  if (params.property) {
    return doSomething()
      .then(resolveIfTruthy);
  } else {
    return doSomethingElse()
      .then(resolveIfTruthy);
  }
}

需要帮助弄清楚如何写有条件的承诺

Need help figuring out how to write promise with conditional

javascript

promise

typescript

ecmascript-6

bluebird