Make multiple screenshots with nightmare-screenshot-selector

Question

I have a web-page with set of 'li' elements. I need to make screenshots for each 'li' element and save it to a new files. I'm trying to use nightmare-screenshot-selector for it. But I get a few files with the same screenshot but with different names (from my array).

Here is my code.

const Nightmare     = require('nightmare');
const fs            = require('fs');
const screenshotSelector = require('nightmare-screenshot-selector');
Nightmare.action('screenshotSelector', screenshotSelector);

function savePicture(picture) {
    picture = ['v1', 'v2', 'v3'];
    let browser = Nightmare({
        show: false,
        webPreferences: {
            partition: 'nopersist'
        }
    });
    browser   
        .goto('https://www.google.com')
    picture.forEach(v => {  
        browser   
            .wait(7000)
            .screenshotSelector(`li[class="${v}"]`) 
            .then(function (data) {                 
                fs.writeFileSync(`img/${v}.png`, data)
            })
            .catch((error) => {
                console.log('Error loading the page', error)
            })
    })
    browser.end();
}

Answer 1

I inserted a .end() call, works for me. Slightly modified code, grabs two regions of Google home page:

function savePicture(picture) {
    picture = ['div#hplogo', 'div.tsf-p'];
    let browser = Nightmare({
        show: false,
        webPreferences: {
            partition: 'nopersist'
        }
    });
    browser   
        .goto('https://www.google.com')
    picture.forEach(v => {  
        browser   
            .wait(2000)
            .screenshotSelector(v) 
            .then(function (data) {                 
                fs.writeFileSync(`img/${v}.png`, data)
            })
            .then(()=> {
                browser.end();
            })
            .catch((error) => {
                console.log('Error loading the page', error)
            })
        })
    }