typescript unhandledRejection Promise

Question

我使用 typescript 调用外部进程，如下所示：

import { execSync } from 'child_process'
execSync('/my/executable/here')

但可执行文件中存在错误，导致 execSync 失败。有没有办法捕获错误（作为字符串）并将其打印或分配给变量？

我试过这样做，但代码仍然说“unhandledRejection Promise”

let promise = new Promise((resolve, reject) => {
    execSync('/my/executable/here')
})
promise.then(result => console.log('CALL RAN'))
promise.catch(error => console.log('FOUND ERROR'))

我得到的错误如下所示：

2019-11-26T00:17:23.060 ERROR (pid:36622) [server] - unhandledRejection  Promise {
  <rejected> Error: Command failed: /my/executable/here

Answer 1

您需要捕获错误，然后酌情解决/拒绝。

例如

// Try to use const where possible
const promise = new Promise((resolve, reject) => {
  try {  
    execSync('/my/executable/here');
    resolve();
  } catch(e) {
    reject(e);
  }
})

// Chain the promise handlers
promise
  .then(result => console.log('CALL RAN'))
  .catch(error => console.log('FOUND ERROR'));