log( "CHILD: url received from parent process", url) Ĭonst browser = await puppeteer. The code snippet below is a simple example of running parallel downloads with Puppeteer.Ĭonst downloadPath = path. 💡 If you are not familiar with how child process work in Node I highly encourage you to give this article a read. We can combine the child process module with our Puppeteer script and download files in parallel. Theres a project called Jest Puppeteer, which allows QA and developers to run tests created for Jest with Puppeteer.It offers an easy way to run your tests with Puppeteer and provides specific matchers, tailored to Puppeteer, called expect-puppeteer. Child process is how Node.js handles parallel programming. We can fork multiple child_proces in Node. Our CPU cores can run multiple processes at the same time. 💡 Learn more about the single threaded architecture of node here Therefore if we have to download 10 files each 1 gigabyte in size and each requiring about 3 mins to download then with a single process we will have to wait for 10 x 3 = 30 minutes for the task to finish. It can only execute one process at a time. You see Node.js in its core is a single-threaded system. However, if you have to download multiple large files things start to get complicated. In this next part, we will dive deep into some of the advanced concepts. The problem is I haven't found any Puppeteer configuration I can use for such purpose.Const browser = await puppeteer. Force my users to download Chromium at runtime (at first usage for example).Download Chromium selectively at packaging time (still on dev machine).Download all-platform Chromium when npm install (on dev machine).Output from some of the examples: codecoverage.js Test lazy loading strategy by seeing CSS/JS code coverage usage across page load.
I should be able to do one of the following: Examples for using Puppeteer to do big, bold things. Being current platform Linux, this very version of Chromium is then shipped regardlessly on every platform's app. Click any example below to run it instantly proxy whatsapp-web. The problem is: Chromium is downloaded at npm install time, and it's done selectively based on the current platform. Puppeteer Examples and Templates Use this online puppeteer playground to view and fork puppeteer example apps and templates on CodeSandbox. It works nice-and-smooth except for this issue:Ĭhromium is not downloaded exception is thrown when the app is executed on a platform different than the one the app has been packaged on.īetter said, I'm developing on a Linux environment and I'm packaging my app for both Linux and Windows, Linux app works fine, Windows app doesn't.
I'm building a UI-automator with Puppeteer and I'm shipping it as a Electron-packaged app.
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