script.js

/**
 * Script that gets a screenshot of every file linked in a Markdown file
 */
var fs = require('fs');
var visit = require('unist-util-visit');
var Pageres = require('pageres');
var remark = require('remark');
var ast = remark.parse(fs.readFileSync('DOCS.md', 'utf8'));

var urls = [];
visit(ast, 'link', function(link) {
  urls.push(link.url);
});

const pageres = new Pageres({delay: 2})
  .dest('output');

pageres = urls
  .filter(url => !url.match(/twitter/))
  .reduce((memo, url) => pageres.src(url, ['1280x1024']), pageres);

pageres.on('warn', err => console.error(err));

pageres.run()
  .then(() => console.log('done'));