mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Andrew Clark
9b5e0517b4
* Remove deprecated folder mapping Node v16 deprecated the use of trailing "/" to define subpath folder mappings in the "exports" field of package.json. The recommendation is to explicitly list all our exports. We already do that for all our public modules. I believe the only reason we have a wildcard pattern is because our package.json files are also used at build time (by Rollup) to resolve internal source modules that don't appear in the final npm artifact. Changing trailing "/" to "/*" fixes the warnings. See https://nodejs.org/api/packages.html#subpath-patterns for more info. Since the wildcard pattern only exists so our build script has access to internal at build time, I've scoped the wildcard to "/src/*". Because our public modules are located outside the "src" directory, this means deep imports of our modules will no longer work: only packages that are listed in the "exports" field. The only two affected packages are react-dom and react. We need to be sure that all our public modules are still reachable. I audited the exports by comparing the entries to the "files" field in package.json, which represents a complete list of the files that are included in the final release artifact. At some point, we should add an e2e packaging test to prevent regressions; for now, we should have decent coverage because in CI we run our Jest test suite against the release artifacts. * Remove umd from exports Our expectation is that if you're using the UMD builds, you're not loading them through a normal module system like require or import. Instead you're probably copying the files directly or loading them from a CDN like unpkg.
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');