cheerio-with-promises.js

const cheerio = require('cheerio')
const html = `
<ul>
  <li>Hello A</li>
  <li>Hello B</li>
  <li>Hello C</li>
</ul>
`
const $ = cheerio.load(html)

function parse (input) {
  return Promise.resolve(input.replace('Hello', 'Goodbye'))
}

console.log($.html())

Promise.all(
  $('li')
    .map((i, el) => parse($(el).html()))
    .get()
).then(intros => {
  console.log(intros)
})

Here's a variant that actually mutates the $(el) HTML on the fly:

const cheerio = require('cheerio')
const html = `
<ul>
  <li>Hello A</li>
  <li>Hello B</li>
  <li>Hello C</li>
</ul>
`
const $ = cheerio.load(html)

function parse (input) {
  return Promise.resolve(input.replace('Hello', 'Goodbye'))
}

console.log('\n\nBefore')
console.log($.html())

Promise.all(
  $('li')
    .map((i, el) => {
      return parse($(el).html()).then(parsed => {
        return $(el).html(parsed)
      })
    })
    .get()
).then(intros => {
  console.log('\n\nAfter')
  console.log($.html())
})