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Hermes parser is the preferred parser for Flow code going forward. We need to upgrade to this parser to support new Flow syntax like function `this` context type annotations or `ObjectType['prop']` syntax. Unfortunately, there's quite a few upgrades here to make it work somehow (dependencies between the changes) - ~Upgrade `eslint` to `8.*`~ reverted this as the React eslint plugin tests depend on the older version and there's a [yarn bug](https://github.com/yarnpkg/yarn/issues/6285) that prevents `devDependencies` and `peerDependencies` to different versions. - Remove `eslint-config-fbjs` preset dependency and inline the rules, imho this makes it a lot clearer what the rules are. - Remove the turned off `jsx-a11y/*` rules and it's dependency instead of inlining those from the `fbjs` config. - Update parser and dependency from `babel-eslint` to `hermes-eslint`. - `ft-flow/no-unused-expressions` rule replaces `no-unused-expressions` which now allows standalone type asserts, e.g. `(foo: number);` - Bunch of globals added to the eslint config - Disabled `no-redeclare`, seems like the eslint upgrade started making this more precise and warn against re-defined globals like `__EXPERIMENTAL__` (in rollup scripts) or `fetch` (when importing fetch from node-fetch). - Minor lint fixes like duplicate keys in objects.
react-server
This is an experimental package for creating custom React streaming server renderers.
Its API is not as stable as that of React, React Native, or React DOM, and does not follow the common versioning scheme.
Use it at your own risk.