Run your tests directly in the latest version of Chrome using the latest JavaScript and browser features.
Create an up-to-date, automated testing environment. Automate form submission, UI testing, keyboard input, etc. Crawl a SPA (Single-Page Application) and generate pre-rendered content (i.e. Generate screenshots and PDFs of pages. Most things that you can do manually in the browser can be done using Puppeteer! Here are a few examples to get you started: Puppeteer runs headless by default, but can be configured to run full (non-headless) Chrome or Chromium. > Puppeteer is a Node library which provides a high-level API to control Chrome or Chromium over the DevTools Protocol. Hopefully it's clear now that if you have production code, you can't rely on NPM actually maintaining your dependencies for you.API | FAQ | Contributing | Troubleshooting A few days ago, somebody unpublished all of their packages ( ) which broke React, Babel, and just about everything else. I've received a lot of flak for my response, specifically that I check in the packages that my code depends on. 
To install packages from package-lock.json instead of package.json use the command npm ci. Therefore you can leave out checking in packages, because the package-lock.json tracks the exact versions of your node_modules, you're currently using. Nowadays you can use package-lock.json file, which is automatically generated when npm modifies your node_modules directory.
I usually install most packages locally so that they get checked in along with my project code. Is app.js located under home/dave/src/server/? If not and you want to use the module from any directory, you need to install it globally using npm install -g. Using npm install installs the module into the current directory only (in a subdirectory called node_modules).
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