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Published 20 hours ago • verified publisher icon ImmoweltGroup

TASK: Update dependency react-redux to v8

Open renovate[bot] opened this issue 2 years ago • 0 comments

Mend Renovate

This PR contains the following updates:

Package Change Age Adoption Passing Confidence
react-redux 5.1.2 -> 8.1.1 age adoption passing confidence

Release Notes

reduxjs/react-redux (react-redux)

v8.1.1

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This bugfix release tweaks the recent lazy context setup logic to ensure a single React context instance per React version, and removes the recently added RTK peerdep to fix an issue with Yarn workspaces.

Changelog
React Context Singletons

React Context has always relied on reference identity. If you have two different copies of React or a library in a page, that can cause multiple versions of a context instance to be created, leading to problems like the infamous "Could not find react-redux context" error.

In v8.1.0, we reworked the internals to lazily create our single ReactReduxContext instance to avoid issues in a React Server Components environment.

This release further tweaks that to stash a single context instance per React version found in the page, thus hopefully avoiding the "multiple copies of the same context" error in the future.

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v8.1.0...v8.1.1

v8.1.0

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This feature release adds new development-mode safety checks for common errors (like poorly-written selectors), adds a workaround to fix crash errors when React-Redux hooks are imported into React Server Component files, and updates our hooks API docs page with improved explanations and updated links.

Changelog

Development Mode Checks for useSelector

We've had a number of users tell us over time that it's common to accidentally write selectors that have bad behavior and cause performance issues. The most common causes of this are either selectors that unconditionally return a new reference (such as state => state.todos.map() without any memoization ), or selectors that actually return the entire root state ( state => state ).

We've updated useSelector to add safety checks in development mode that warn if these incorrect behaviors are detected:

  • Selectors will be called twice with the same inputs, and useSelector will warn if the results are different references
  • useSelector will warn if the selector result is actually the entire root state

By default, these checks only run once the first time useSelector is called. This should provide a good balance between detecting possible issues, and keeping development mode execution performant without adding many unnecessary extra selector calls.

If you want, you can configure this behavior globally by passing the enum flags directly to <Provider>, or on a per-useSelector basis by passing an options object as the second argument:

// Example: globally configure the root state "noop" check to run every time
<Provider store={store} noopCheck="always">
  {children}
</Provider>

// Example: configure `useSelector` to specifically run the reference checks differently:
function Component() {
  // Disable check entirely for this selector
  const count = useSelector(selectCount, { stabilityCheck: 'never' })
  // run once (default)
  const user = useSelector(selectUser, { stabilityCheck: 'once' })
  // ...
}

This goes along with the similar safety checks we've added to Reselect v5 alpha as well.

Context Changes

We're still trying to work out how to properly use Redux and React Server Components together. One possibility is using RTK Query's createApi to define data fetching endpoints, and using the generated thunks to fetch data in RSCs, but it's still an open question.

However, users have reported that merely importing any React-Redux API in an RSC file causes a crash, because React.createContext is not defined in RSC files. RTKQ's React-specific createApi entry point imports React-Redux, so it's been unusable in RSCs.

This release adds a workaround to fix that issue, by using a proxy wrapper around our singleton ReactReduxContext instance and lazily creating that instance on demand. In testing, this appears to both continue to work in all unit tests, and fixes the import error in an RSC environment. We'd appreciate further feedback in case this change does cause any issues for anyone!

We've also tweaked the internals of the hooks to do checks for correct <Provider> usage when using a custom context, same as the default context checks.

Docs Updates

We've cleaned up some of the Hooks API reference page, and updated links to the React docs.

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v8.0.7...v8.1.0

v8.0.7

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This release updates the peer dependencies to accept Redux Toolkit, and accept the ongoing RTK and Redux core betas as valid peer deps.

Note: These changes were initially in 8.0.6, but that had a typo in the peer deps that broke installation. Sorry!

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v8.0.5...v8.0.7

v8.0.6

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~~This release updates the peer dependencies to accept Redux Toolkit, and accept the ongoing RTK and Redux core betas as valid peer deps.~~

This release has a peer deps typo that breaks installation - please use 8.0.7 instead !

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v8.0.5...v8.0.6

v8.0.5

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This release fixes a few minor TS issues.

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v8.0.4...v8.0.5

v8.0.4

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This patch release fixes some minor TS types issues, and updates the rarely-used areStatesEqual option for connect to now pass through ownProps for additional use in determining which pieces of state to compare if desired.

Note: 8.0.3 was accidentally published without one of these fixes. Use 8.0.4 instead.

Changelog

TS Fixes

We've fixed an import of React that caused issues with the allowSyntheticDefaultImports TS compiler flag in user projects.

connect already accepted a custom context instance as props.context, and had runtime checks in case users were passing through a real value with app data as props.context instead. However, the TS types did not handle that case, and this would fail to compile. If your own component expects props.context with actual data, connect's types now use that type instead.

The ConnectedProps<T> type had a mismatch with React's built-in React.ComponentProps<Component> type, and that should now work correctly.

Other Changes

The areStatesEqual option to connect now receives ownProps as well, in case you need to make a more specific comparison with certain sections of state.

The new signature is:

{
  areStatesEqual?: (
    nextState: State,
    prevState: State,
    nextOwnProps: TOwnProps,
    prevOwnProps: TOwnProps
  ) => boolean
}

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v8.0.2...v8.0.4

v8.0.3

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This release was accidentally published without an intended fix - please use v8.0.4 instead

v8.0.2

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This patch release tweaks the behavior of connect to print a one-time warning when the obsolete pure option is passed in, rather than throwing an error. This fixes crashes caused by libraries such as react-beautiful-dnd continuing to pass in that option (unnecessarily) to React-Redux v8.

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v8.0.1...v8.0.2

v8.0.1

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This release fixes an incorrect internal import of our Subscription type, which was causing TS compilation errors in some user projects. We've also listed @types/react-dom as an optional peerDep. There are no runtime changes in this release.

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v8.0.0...v8.0.1

v8.0.0

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This major version release updates useSelector, connect, and <Provider> for compatibility with React 18, rewrites the React-Redux codebase to TypeScript (obsoleting use of @types/react-redux), modernizes build output, and removes the deprecated connectAdvanced API and the pure option for connect.

npm i react-redux@latest

yarn add react-redux@latest

Overview, Compatibility, and Migration

Our public API is still the same ( <Provider>, connect and useSelector/useDispatch), but we've updated the internals to use the new useSyncExternalStore hook from React. React-Redux v8 is still compatible with all versions of React that have hooks (16.8+, 17.x, and 18.x; React Native 0.59+), and should just work out of the box.

In most cases, it's very likely that the only change you will need to make is bumping the package version to "react-redux": "^8.0".

If you are using the rarely-used connectAdvanced API, you will need to rewrite your code to avoid that, likely by using the hooks API instead. Similarly, the pure option for connect has been removed.

If you are using Typescript, React-Redux is now written in TS and includes its own types. You should remove any dependencies on @types/react-redux.

While not directly tied to React-Redux, note that the recently updated @types/react@18 major version has changed component definitions to remove having children as a prop by default. This causes errors if you have multiple copies of @types/react in your project. To fix this, tell your package manager to resolve @types/react to a single version. Details:

React issue #​24304: React 18 types broken since release

Additionally, please see the React post on How to Ugprade to React 18 for details on how to migrate existing apps to correctly use React 18 and take advantage of its new features.

Changelog

React 18 Compatibility

React-Redux now requires the new useSyncExternalStore API in React 18. By default, it uses the "shim" package which backfills that API in earlier React versions, so React-Redux v8 is compatible with all React versions that have hooks (16.8+, and React Native 0.59+) as its acceptable peer dependencies.

We'd especially like to thank the React team for their extensive support and cooperation during the useSyncExternalStore development effort. They specifically designed useSyncExternalStore to support the needs and use cases of React-Redux, and we used React-Redux v8 as a testbed for how useSyncExternalStore would behave and what it needed to cover. This in turn helped ensure that useSyncExternalStore would be useful and work correctly for other libraries in the ecosystem as well.

Our performance benchmarks show parity with React-Redux v7.2.5 for both connect and useSelector, so we do not anticipate any meaningful performance regressions.

useSyncExternalStore and Bundling

The useSyncExternalStore shim is imported directly in the main entry point, so it's always included in bundles even if you're using React 18. This adds roughly 600 bytes minified to your bundle size.

If you are using React 18 and would like to avoid that extra bundle cost, React-Redux now has a new /next entry point. This exports the exact same APIs, but directly imports useSyncExternalStore from React itself, and thus avoids including the shim. You can alias "react-redux": "react-redux/next" in your bundler to use that instead.

SSR and Hydration

React 18 introduces a new hydrateRoot method for hydrating the UI on the client in Server-Side Rendering usage. As part of that, the useSyncExternalStore API requires that we pass in an alternate state value other than what's in the actual Redux store, and that alternate value will be used for the entire initial hydration render to ensure the initial rehydrated UI is an exact match for what was rendered on the server. After the hydration render is complete, React will then apply any additional changes from the store state in a follow-up render.

React-Redux v8 supports this by adding a new serverState prop for <Provider>. If you're using SSR, you should pass your serialized state to <Provider> to ensure there are no hydration mismatch errors:

import { hydrateRoot } from 'react-dom/client'
import { configureStore } from '@&#8203;reduxjs/toolkit'
import { Provider } from 'react-redux'

const preloadedState = window.__PRELOADED_STATE__

const clientStore = configureStore({
  reducer: rootReducer,
  preloadedState,
})

hydrateRoot(
  document.getElementById('root'),
  <Provider store={clientStore} serverState={preloadedState}>
    <App />
  </Provider>
)
TypeScript Migration and Support

The React-Redux library source has always been written in plain JS, and the community maintained the TS typings separately as @types/react-redux.

We've (finally!) migrated the React-Redux codebase to TypeScript, using the existing typings as a starting point. This means that the @types/react-redux package is no longer needed, and you should remove that as a dependency.

Note Please ensure that any installed copies of redux and @types/react are de-duped. You are also encouraged to update to the latest versions of Redux Toolkit (1.8.1+) or Redux (4.1.2), to ensure consistency between installed types and avoid problems from types mismatches.

We've tried to maintain the same external type signatures as much as possible. If you do see any compile problems, please file issues with any apparent TS-related problems so we can review them.

The TS migration was a great collaborative effort, with many community members contributing migrated files. Thank you to everyone who helped out!

In addition to the "pre-typed" TypedUseSelectorHook, there's now also a Connect<State = unknown> type that can be used as a "pre-typed" version of connect as well.

As part of the process, we also updated the repo to use Yarn 3, copied the typetests files from DefinitelyTyped and expanded them, and improved our CI setup to test against multiple TS versions.

Removal of the DefaultRootState type

The @types/react-redux package, which has always been maintained by the community, included a DefaultRootState interface that was intended for use with TS's "module augmentation" capability. Both connect and useSelector used this as a fallback if no state generic was provided. When we migrated React-Redux to TS, we copied over all of the types from that package as a starting point.

However, the Redux team specifically considers use of a globally augmented state type to be an anti-pattern. Instead, we direct users to extract the RootState and AppDispatch types from the store setup, and create pre-typed versions of the React-Redux hooks for use in the app.

Now that React-Redux itself is written in TS, we've opted to remove the DefaultRootState type entirely. State generics now default to unknown instead.

Technically the module augmentation approach can still be done in userland, but we discourage this practice.

Modernized Build Output

We've always targeted ES5 syntax in our published build artifacts as the lowest common denominator. Even the "ES module" artifacts with import/export keywords still were compiled to ES5 syntax otherwise.

With IE11 now effectively dead and many sites no longer supporting it, we've updated our build tooling to target a more modern syntax equivalent to ES2017, which shrinks the bundle size slightly.

If you still need to support ES5-only environments, please compile your own dependencies as needed for your target environment.

Removal of Legacy APIs

We announced in 2019 that the legacy connectAdvanced API would be removed in the next major version, as it was rarely used, added internal complexity, and was also basically irrelevant with the introduction of hooks. As promised, we've removed that API.

We've also removed the pure option for connect, which forced components to re-render regardless of whether props/state had actually changed if it was set to false. This option was needed in some cases in the early days of the React ecosystem, when components sometimes relied on external mutable data sources that could change outside of rendering. Today, no one writes components that way, the option was barely used, and React 18's useSyncExternalStore strictly requires immutable updates. So, we've removed the pure flag.

Given that both of these options were almost never used, this shouldn't meaningfully affect anyone.

Changes

Due to the TS migration effort and number of contributors, this list covers just the major changes:

v7.2.9

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This patch release updates the rarely-used areStatesEqual option for connect to now pass through ownProps for additional use in determining which pieces of state to compare if desired.

The new signature is:

{
  areStatesEqual?: (
    nextState: State,
    prevState: State,
    nextOwnProps: TOwnProps,
    prevOwnProps: TOwnProps
  ) => boolean
}

What's Changed

Full Changelog: https://github.com/reduxjs/react-redux/compare/v7.2.8...v7.2.9

v7.2.8

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This release fixes a bug in the 7.x branch that caused <Provider> to unsubscribe and stop updating completely when used inside of React 18's <StrictMode>. The new "strict effects" behavior double-mounts components, and the subscription needed to be set up inside of a useLayoutEffect instead of a useMemo. This was previously fixed as part of v8 development, and we've backported it.

Note: If you are now using React 18, we strongly recommend using the React-Redux v8 beta instead of v7.x!. v8 has been rewritten internally to work correctly with React 18's Concurrent Rendering capabilities. React-Redux v7 will run and generally work okay with existing code, but may have rendering issues if you start using Concurrent Rendering capabilities in your code.

Now that React 18 is out, we plan to finalize React-Redux v8 and release it live within the next couple weeks. Per an update yesterday in the "v8 roadmap" thread, React-Redux v8 will be updated in the next couple days to ensure support for React 16.8+ as part of the next beta release. We would really appreciate final feedback on using React-Redux v8 beta with React 18 before we publish the final version.

Full Changelog: https://github.com/reduxjs/react-redux/compare/v7.2.7...v7.2.8

v7.2.7

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This release updates React-Redux v7's peer dependencies to accept React 18 as a valid version, only to avoid installation errors caused by NPM's "install all the peer deps and error if they don't match" behavior.

Note: If you are now using React 18, we strongly recommend using the React-Redux v8 beta instead of v7.x!. v8 has been rewritten internally to work correctly with React 18's Concurrent Rendering capabilities. React-Redux v7 will run and generally work okay with existing code, but may have rendering issues if you start using Concurrent Rendering capabilities in your code.

Now that React 18 is out, we plan to finalize React-Redux v8 and release it live within the next couple weeks. We would really appreciate final feedback on using React-Redux v8 beta with React 18 before we publish the final version.

v7.2.6

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Just a quick fix for a Yarn install warning. Sorry about the noise!

Changes

  • Remove workspaces from our package.json to silence a Yarn warning (@​timdorr)

v7.2.5

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This release shrinks the size of our internal Subscription class, and updates useSelector to avoid an unnecessary selector call on mount.

Changes

Subscription Size Refactor

Our internal Subscription implementation has been written as a class ever since it was added in v5. By rewriting it as a closure factory, we were able to shave a few bytes off the final bundle size.

useSelector Mount Optimization

A user noticed that useSelector had never been given an early "bail out if the root state is the same" check to match how connect works. This resulted in a usually-unnecessary second call to the provided selector on mount. We've added that check.

Entry Point Consolidation

We've consolidated the list of exported public APIs into a single file, and both the index.js and alternate-renderers.js entry points now re-export everything from that file. No meaningful change here, just shuffling lines of code around for consistency.

Other Updates

React-Redux v8 and React 18 Development

With the announcement of React 18, we've been working with the React team to plan our migration path to keep React-Redux fully compatible with React's upcoming features.

We've already migrated the React-Redux main development branch to TypeScript, and are prototyping compatibility implementation updates. We'd appreciate any assistance from the community in testing out these changes so that we can ensure React-Redux works great for everyone when React 18 is ready!

Internal Tooling Updates

Our master branch now uses Yarn v2 for package management, is built with TypeScript, and we've made CI updates to test against multiple TS versions.

The 7.x branch has also been updated to use Yarn v2 for consistency.

These only affect contributors to the React-Redux package itself.

Changelog

v7.2.4

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This release drops our dependency on the core redux package by inlining bindActionCreators, and tweaks useSelector to ensure that selectors aren't run an extra time while re-rendering.

Changelog

Redux Dependency Removal

React-Redux has always imported the bindActionCreators utility from the core redux package for use in connect. However, that meant that we had to have a peer dependency on redux, and this was the only reason we actually required that redux be installed. This became more annoying with the arrival of Redux Toolkit, which has its own dependency on redux internally, and thus users typically saw peer dependency warnings saying that "redux isn't listed as a dependency in your app".

Code reuse across separate packages is a great thing, but sometimes the right thing to do is duplicate code. So, we've inlined bindActionCreators directly into React-Redux, and we've completely dropped the dependency on Redux. This means that React-Redux will no longer produce a peerDep warning when used with Redux Toolkit, and <Provider> and connect really only need a Redux-store-compatible value to work right.

useSelector Fixes

Users reported that useSelector was re-running selector functions again unnecessarily while rendering after a dispatch. We've tweaked the logic to ensure that doesn't happen.

useSelector also now has checks in development to ensure that selector and equalityFn are functions.

Changes

v7.2.3

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This release improves behavior in useSelector by returning the existing reference if the newly returned selector result passes the equality check, and adds a hard dependency on the @types/react-redux package to ensure TS users always have the typedefs installed.

Changes

useSelector Results Reuse

Issue #​1654 reported that useSelector was returning new references from a selector even if the equality comparison function returned true. This is because the equality check was only ever being performed during the action dispatch process.

We now run the equality comparison against the value calculated by the selector while rendering, and return the existing reference for consistency if the old and new values are considered equal. This should improve some cases where further derived values where being recalculated unnecessarily.

TS Types Now Included

React-Redux has always been written in plain JS, and the typedefs maintained by the community in DefinitelyTyped. We plan on eventually rewriting the library in TypeScript in a future React-Redux v8 release, but until then the types can stay in DT.

However, having to always manually install @types/react-redux is annoying, and some users have gotten confused by that. This release adds a hard dependency on @types/react-redux, so that if you install react-redux, you automatically get the types as well. This should simplify the process for TS users.

Docs Updates

We've made several docs updates recently:

  • Renamed "Quick Start" to "Getting Started" and "Static Typing" to "Usage with TypeScript"
  • Dropped the docs API versioning setup, as the legacy API version docs pages were rarely viewed and the versioning setup confused docs contributors
  • Moved the old "Intro > Basic Tutorial" to "Tutorials > Connect" and marked it as semi-obsolete

We are currently working on a new React-Redux tutorial that will teach the React-Redux hooks as the primary approach, based on the "UI and React" page in the Redux docs "Fundamentals" tutorial.

Changelog

v7.2.2

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This release allows you to use React Redux with React 17 without a warning when installing. That's about it.

Changes

v7.2.1

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This release improves useSelector value display in the React DevTools, fixes a potential race condition, and fixes a couple additional minor issues.

useSelector DevTools Display

The React DevTools normally show custom hooks with their inspected name (such as "Selector" for useSelector), and any calls to core hooks inside. This is not always informative, so React has the useDebugValue hook to allow custom hooks to specify what value should be shown instead.

useSelector now calls useDebugValue to specifically show the current selected value instead of its internal hooks usage.

Bug Fixes

This release has a few different bug fixes:

  • A potential race condition when dispatching actions from child components in the commit phase vs selecting data in a parent
  • Removed an excess new object creation when forcing a re-render
  • Our internal prop name for a forwarded ref is now reactReduxForwardedRef to avoid a rare situation where someone else might be passing down a field named forwardedRef
  • Fixed a typo in a useSelector error message
Changes

v7.2.0

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This release fixes two bugs, an algorithmic problem with unsubscribing components and a memory leak with connect. It also has optimizations for production bundle size, and adds a couple small improvements to developer readability while debugging.

Bug Fixes

connect in v7 is implemented using hooks, and the hooks usage captures numerous values from the surrounding scope. We received a PR informing us that the way we were capturing these values would likely result in a copy of the first version of its props being kept alive indefinitely.

This memory leak has been fixed by extracting a custom hook that receives all the necessary values as arguments, so that they're not captured via closure.

We also received a PR letting us know that the unsubscribe logic had a quadratic algorithm in it, as removing a subscriber would use an indexOf(listener) check to remove that callback. If there were a large number of subscribers, that line's runtime would increase rapidly, causing slowdowns.

This algorithm has been replaced with tracking subscribers via a linked list, which drastically improves the runtime of this section of the code even with large numbers of subscribers.

Thanks to @​larrylin28 and @​wurstbonbon for finding these bugs and submitting PRs to fix them!

Bundle Size Improvements

We've made a number of small tweaks to the codebase to improve the ability of bundlers to shake and minimize the final included size in a bundle. The net result is that [email protected] is smaller than 7.1.3, dropping 1.3K min and 0.6K min+gzip. (In fact, it's even smaller than the pre-hooks 7.0.0 when gzipped!)

Thanks to @​Andarist for doing most of the work on this!

Debugging Improvements

The ReactReduxContext instance now has a displayName set, so it should show up in the React DevTools as ReactRedux.Provider.

Also, when an error is caught in useSelector and re-thrown, we now append the original stack trace.

Thanks to @​pieplu and @​r3dm1ke for these!

Changes

v7.1.3

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Forgot to remove a console statement before I published 7.1.2. Oops!

Lint your source code before publishing, folks.

Changes

v7.1.2

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This releases fixes a subtle timing bug with connect and useSelector in React Native environments, and adds the ability to pass through non-Redux-store values as a store prop.

Fixed Store Subscriptions in React Native

Our current implementation requires cascading updates down through connected components. This is primarily done during React's "commit phase" via the useLayoutEffect hook. Unfortunately, React warns when useLayoutEffect is called in SSR environments, so we try to feature-detect that and fall back to useEffect just to avoid that warning.

Unfortunately, a tweak to the feature detection conditions during the pre-7.1.0 work caused the check to accidentally fail in React Native environments. This meant that useEffect was actually being used all the time, and this led to occasional timing bugs such as #​1313 and #​1437 . This affected the previous v7.1.x releases.

We've fixed that issue, and added additional test cases to ensure that our code works correctly under React Native.

See #​1444 for more details on the feature detection and the fix.

Passing Through Non-Store Values

connect has always accepted passing a Redux store directly to connected components as a prop named store (with the exception of v6). As a result, the store prop has effectively been treated as a "reserved" prop, in much the same way that key and ref are "reserved" prop names handled by React.

Some users may be using the word "store" to describe their domain data, and have asked to allow variables that aren't a Redux store through the store prop to the component (#​1393). We've finally been able to implement that capability.

Changes

v7.1.1

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This release includes some new APIs for those that want to use a custom React Context with our Hooks API, a small memory optimization, and has a fix for when the store changes on a Provider with incompatible children.

Changes

v7.1.0

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Hooks!

After much discussion, we've decided these Hook things are probably going to stick around, so we might as well add some. Many thanks to @​MrWolfZ, @​josepot, @​perrin4869, and @​mpeyper for their contributions and to everyone else that offered feedback, ideas, and critiques as we built them out. Go open source!

Changes

v7.0.3

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This release includes a bugfix for a timing issue in connect(), and also lowers our React peer dependency slightly to allow better usage with React Native 0.59.

Changes

v7.0.2

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This is a bug fix release with a small performance improvement and fix for nested component unmounting.

Changes

v7.0.1

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React-Redux version 7 resolves the performance issues that were reported with version 6, and lays the groundwork for us to design and ship a public useRedux()-type Hooks API in a later 7.x release.

The major change for this release is that connect is now implemented using Hooks internally. Because of this, we now require a minimum React version of 16.8.4 or higher.

This release has undergone extensive performance benchmarking, and we're confident that it's the fastest version of React-Redux yet! We've also expanded our test suite to cover a number of additional use cases and scenarios.

npm install react-redux@latest

For discussion on the reasons for the major version change and the development process, see:

issue #​1177 - React-Redux Roadmap: v6, Context, Subscriptions, and Hooks.

For discussion on the possible design of a future public hooks API, see:

issue #​1179: Discussion: Potential hooks API design

Changes

This release should be public-API-compatible with version 6. The only public breaking change is the update of our React peer dependency from 16.4 to 16.8.4.

Note: connect now uses React.memo() internally, which returns a special object rather than a function. Any code that assumed React components are only functions is wrong, and has been wrong since the release of React 16.6. If you were using PropTypes to check for valid component types, you should change from PropTypes.func to PropTypes.elementType instead.

Internal Changes
Direct Component Subscriptions

In v6, we switched from individual components subscribing to the store, to having <Provider> subscribe and components read the store state from React's Context API. This worked, but unfortunately the Context API isn't as optimized for frequent updates as we'd hoped, and our usage patterns led to some folks reporting performance issues in some scenarios.

In v7, we've switched back to using direct subscriptions internally, which should improve performance considerably.

(This does result in some changes that are visible to user-facing code, in that updates dispatched in React lifecycle methods are immediately reflected in later component updates. Examples of this include components dispatching while mounting in an SSR environment. This was the behavior through v5, and is not considered part of our public API.)

Batched Updates

React has an unstable_batchedUpdates API that it uses to group together multiple updates from the same event loop tick. The React team encouraged us to use this, and we've updated our internal Redux subscription handling to leverage this API. This should also help improve performance, by cutting down on the number of distinct renders caused by a Redux store update.

connect Rewritten with Hooks

We've reimplemented our connect wrapper component to use hooks internally. While it may not be visible to you, it's nice to know we can take advantage of the latest React goodies!

Public API Changes
Return of store as a Prop

We've brought back the ability to pass a store as a prop directly to connected components. This was removed in version 6 due to internal implementation changes (components no longer subscribed to the store directly). Some users expressed concerns that working with context

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renovate[bot] avatar Apr 16 '22 19:04 renovate[bot]