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Andrew Clark
163e81c1f8
* Extract `act` environment check into function `act` checks the environment to determine whether to fire a warning. We're changing how this check works in React 18. As a first step, this refactors the logic into a single function. No behavior changes yet. * Use IS_REACT_ACT_ENVIRONMENT to disable warnings If `IS_REACT_ACT_ENVIRONMENT` is set to `false`, we will suppress any `act` warnings. Otherwise, the behavior of `act` is the same as in React 17: if `jest` is defined, it warns. In concurrent mode, the plan is to remove the `jest` check and only warn if `IS_REACT_ACT_ENVIRONMENT` is true. I have not implemented that part yet.
react
React is a JavaScript library for creating user interfaces.
The react package contains only the functionality necessary to define React components. It is typically used together with a React renderer like react-dom for the web, or react-native for the native environments.
Note: by default, React will be in development mode. The development version includes extra warnings about common mistakes, whereas the production version includes extra performance optimizations and strips all error messages. Don't forget to use the production build when deploying your application.
Example Usage
var React = require('react');