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**This API is not intended to ship. This is a temporary unstable hook for internal performance profiling.** This PR exposes `unstable_useContextWithBailout`, which takes a compare function in addition to Context. The comparison function is run to determine if Context propagation and render should bail out earlier. `unstable_useContextWithBailout` returns the full Context value, same as `useContext`. We can profile this API against `useContext` to better measure the cost of Context value updates and gather more data around propagation and render performance. The bailout logic and test cases are based on https://github.com/facebook/react/pull/20646 Additionally, this implementation allows multiple values to be compared in one hook by returning a tuple to avoid requiring additional Context consumer hooks. |
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| .. | ||
| __tests__ | ||
| codes.json | ||
| extract-errors.js | ||
| invertObject.js | ||
| README.md | ||
| transform-error-messages.js | ||
| Types.js | ||
The error code system substitutes React's error messages with error IDs to provide a better debugging support in production. Check out the blog post here.
codes.jsoncontains the mapping from IDs to error messages. This file is generated by the Gulp plugin and is used by both the Babel plugin and the error decoder page in our documentation. This file is append-only, which means an existing code in the file will never be changed/removed.extract-errors.jsis an node script that traverses our codebase and updatescodes.json. You can test it by runningyarn extract-errors. It works by crawling the build artifacts directory, so you need to have either run the build script or downloaded pre-built artifacts (e.g. withyarn download build). It works with partial builds, too.transform-error-messagesis a Babel pass that rewrites error messages to IDs for a production (minified) build.