React version 17 will deprecate several of the class component API
lifecycles: componentWillMount, componentWillReceiveProps, and
componentWillUpdate. A couple of new lifecycles are also being added
to better support async rendering mode.
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Typically, this type of change would require third party libraries to
release a new major version in order to adhere to semver. However,
the react-lifecycles-compat polyfill offers a way to use the new
lifecycles with older versions of React as well (0.14.9+) so no
breaking release is required. This enables shared libraries to
support both older and newer versions of React simultaneously.
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Node.js is an event-based server-side JavaScript engine.
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