除了错误消息之外，您还应该如何访问从 Promise.allSettled() 返回的对象数组中的堆栈跟踪？

Question

Promise.allSettled() returns 状态为已完成或已拒绝的对象及其原因的数组，例如：'[{status: 'rejected', reason: 'Error: some error message}, ...]'

如果您 console.log 错误输出，您可以看到原因和堆栈跟踪。但是，当您将输出保存到日志文件时，您只会看到原因，而不是完整的堆栈跟踪。您还如何保存堆栈跟踪？

Answer 1

原因给你错误信息。对于完整的堆栈跟踪，请使用 reason.stack，如下所示。这里的例子是批处理大量的承诺，以免运行内存不足，堆栈跟踪也被保存：

const fs = require('fs');

const batch = async myArr => {
    const res = [];

    for (let i = 0; i < myArr.length; i += 2) {
        const requests = myArr.slice(i, i + 2).map(num => {
            if (num % 2 === 0) {
                return Promise.resolve(num);
            }

            if (num % 2 === 1) {
                return Promise.reject(Error(`Rejected promise in for loop at num ${ num }`));
            }
        });

        // eslint-disable-next-line no-await-in-loop
        await Promise.allSettled(requests)
            .then(response => res.push(response));
    }

    return res.flat();
};

batch([1, 2, 3, 4, 5, 6])
    .then(res => {
        let failed = [];

        failed = res.filter(re => (re.status === 'rejected'));

        for (let i = 0; i < failed.length; i += 1) {
            fs.appendFileSync('reasons.txt', `${ failed[i].reason }\n`);
            fs.appendFileSync('stack-traces.txt', `${ failed[i].reason.stack }\n`);
        }
    });

除了错误消息之外，您还应该如何访问从 Promise.allSettled() 返回的对象数组中的堆栈跟踪？

How should you access the stack trace returned in the array of objects from Promise.allSettled() in addition to the error message?

node.js

es6-promise