![]() If you use the default react-scripts test command, CRA will not run the tests and give you a big red error that they don't support the "testEnvironment" setting. Changing the test command to jest and adding the configuration above triggers the issue. I compared an empty repo with only jest installed with a CRA repo, which comes with jest. And voilà, it solved the problem.Īpparently setting the "testEnvironment" configuration to the same thing as its default changes Jest's running environment, which is very counterintuitive and confusing to me.Įdit: This is caused by Create React App. Hours later, in a ditch effort of desperation I decided to remove it. According to the docs, however, it's the default, so I didn't think anything of it. Simply remove "testEnvironment": "node" (inside "jest": ) and it was set to: "testEnvironment": "node". Does anyone have any idea what is going on?Īfter more digging I 'fixed' the issue. I've been at this for hours and it seems nobody on the internet has had this problem. Run console.log(process.env) at the start of the test and check what Node version is being used -> All references to Node had that same version: 16.13.0.Remove all other versions of Node installed except v16.13.0.Make Node v16.13.0 the default version using nvm.It seems that when Jest runs it is not using the same environment compared to when I manually run my app with Node. This error did not occur with the polyfill. I am using TypeScript 4.4.4, in case that's relevant (this is not a TypeScript error). Express is run in a Node environment, and hence can run on any platform that runs Node. Fnm is developed with the Node. Visual Studio Code has support for the JavaScript and TypeScript languages out-of-the-box as well as Node.js debugging. Node.js is the runtime and npm is the Package Manager for Node.js modules. It enables developers to simply switch between several Node.js versions and provides an easy means to install, manage, and switch. Node.js is a platform for building fast and scalable server applications using JavaScript. Almost any personal computer should have the necessary performance to run Node during development. Fast Node Manager (fnm) is a command-line utility for managing several Node.js versions on a single system. There is a full list on the Node.js Downloads page. Node v16 comes with its own AbortController, so I removed the polyfill. Node can be run on Windows, macOS, many flavors of Linux, Docker, etc. I had been using a polyfill for a mock AbortController because I was using Node v12 before the upgrade. I upgraded all my packages to the newest versions during the upgrade to v16. NPM integration makes trying out new libraries quick and easy. RunJS is a fantastic tool for prototyping and testing JavaScript and TypeScript code. ![]() Whereas running the code manually with Node worked fine. With access to both Node.js and Browser APIs, RunJS is a very versatile environment to tinker in. ReferenceError: AbortController is not defined After an upgrade to Node v16.13.0 (the LTS version) from v12, I got the following error: ![]()
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