如何找到未在Node.js UnhandledPromiseRejectionWarning中处理的承诺? [英] How to find which promises are unhandled in Node.js UnhandledPromiseRejectionWarning?

问题描述

第7版的Node.js具有用于处理诺言的async/await语法糖，现在在我的代码中经常出现以下警告:

Node.js from version 7 has async/await syntactic sugar for handling promises and now in my code the following warning comes up quite often:

(node:11057) UnhandledPromiseRejectionWarning: Unhandled promise 
rejection (rejection id: 1): ReferenceError: Error: Can't set headers 
after they are sent.
(node:11057) DeprecationWarning: Unhandled promise rejections are 
deprecated. In the future, promise rejections that are not handled 
will terminate the Node.js process with a non-zero exit code.

不幸的是，没有引用到丢失渔获物的那一行. 有没有找到所有方法而无需检查每个try/catch块的方法?

Unfortunately there's no reference to the line where the catch is missing. Is there any way to find it without checking every try/catch block?

推荐答案

听 unhandledRejection 流程事件.

listen unhandledRejection event of process.

process.on('unhandledRejection', (reason, p) => {
  console.log('Unhandled Rejection at: Promise', p, 'reason:', reason);
  // application specific logging, throwing an error, or other logic here
});

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