You don't have to require or import anything to use them. In your test files, jest puts each of these methods and objects into the global environment. Jest documentation uses yarn commands, but npm will also work.
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It works with projects using: In this section, we'd like to link to community posts. You can compare yarn and npm commands in the yarn docs, here.
Babel, typescript, node, react, angular,.
Jest is a delightful javascript testing framework with a focus on simplicity. Jest is a universal testing platform, with the ability to adapt to any javascript library or framework.