async until不进入iteratee (async 3.0.1)

Question

从不调用async.until函数的迭代器

在Windows10上尝试使用node.js 10.16.0、async 3.0.1 (1809)

const async = require('async');
var counter = 0;

async.until(() => {
    console.log('here?')
    return (counter > 10)
}, (cb) => {
    console.log('not here?');
    counter++;
    cb()
}, () => {
    console.log('the end');
})

终端输出

PS C:\Users\hofman\Desktop\Tools\GIT\test> node .
here?
PS C:\Users\hofman\Desktop\Tools\GIT\test>

Answer 1

test参数应该是异步函数，如下所示

const async = require('async');
var counter = 0;

async.until(async () => {
    console.log('here?')
    return (counter > 10)
}, (cb) => {
    console.log('not here?');
    counter++;
    cb()
}, () => {
    console.log('the end');
})

请参阅此处的文档：https://caolan.github.io/async/v3/docs.html#until

或者使用普通的Node风格的异步函数，如下所示

const async = require('async');
var counter = 0;

async.until((cb) => {
    console.log('here?')
    cb(null, counter > 10)
}, (cb) => {
    console.log('not here?');
    counter++;
    cb()
}, () => {
    console.log('the end');
})

在版本2.x中，test参数被定义为一个普通的函数https://caolan.github.io/async/v2/docs.html#until

下面是v3.0的Changelog：https://github.com/caolan/async/blob/master/CHANGELOG.md#breaking-changes

whilst、doWhilst、until和doUntil现在具有异步测试函数