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Oct 7, 2020 - JavaScript
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React (also known as React.js or ReactJS) is a JavaScript library that makes developing interactive user interfaces simple.
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This is a good first PR!
We should add some tests to cover #7036. They should cover both JavaScript and TypeScript support.
They can probably be added to test/fixtures.
The examples/with-emotion example is using Emotion 10.
According to the Emotion SSR docs, the _document.js file is no longer required:

Created by Jordan Walke
Released March 2013
Latest release 7 months ago
PR #19108 caused some Suspense-related DevTools regressions (more info available on #19368) which we did not catch because of the fact that DevTools tests are only run against the version of React in master.
We should follow the precedent of the regression fixtures tests and have CI run DevTools tests against multiple