Bun extends JavaScriptCore, the performance-minded JS engine built for Safari. In edge computing environments, reducing cold start times is critical. There are many more classes and methods with Puppeteer, and a full list can be found here.Bun is a new JavaScript runtime built from scratch to serve the modern JavaScript ecosystem, with three major design goals: Separating the selectors and methods adds to further readability and makes the tests easier to maintain. We are using CSS selectors and the innerText pageFunction to evaluate the selector and return its inner text. This allows us to use the method elementHandle.$eval(selector, pageFunction, rewritten as app.$eval(introSelector, el => el.innerText).

In this example, we've created an elementHandle instance from our app page object. The Puppeteer API has classes with methods that allow us to interact with a page. If you want to skip this section and add this set-up to your current project, you can jump to Adding to an Existing Project. To see Puppeteer in action, let's take a look at a sample project. However, it offers much faster and less-flaky browser automation than Selenium-Webdriver. There are a couple of limitations – Puppeteer is JavaScript-only (it’s a node.js library), and currently limited to Chromium or Chrome (though at time of writing there is an experimental puppeteer-firefox package). It runs headless by default but can easily be configured to run in a browser. Developed by Google, Puppeteer controls Chromium or Chrome through a high-level API. Puppeteer is a powerful tool for UI automation. It uses Jest as a test runner, modern JavaScript features and the page object model, and shows how easy it is to get Puppeteer up and running. This project provides a simple way to add Puppeteer to a create-react-app generated app.

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