Bug Fixes (from CHANGELOG.md)

• Guarantee Concast cleanup without Observable cancelled prematurely rejection, potentially solving long-standing issues involving that error. @benjamn in #9701

• Ensure useSubscription subscriptions are properly restarted after unmounting/remounting by React 18 in <StrictMode>. @kazekyo in #9707

Improvements (from CHANGELOG.md)

• Internalize useSyncExternalStore shim, for more control than use-sync-external-store provides, fixing some React Native issues. @benjamn in #9675 and #9709

• Provide @apollo/client/**/*.cjs.native.js versions of every @apollo/client/**/*.cjs bundle (including dependencies ts-invariant and zen-observable-ts) to help React Native's Metro bundler automatically resolve CommonJS entry point modules. These changes should render unnecessary the advice we gave in the v3.5.4 section below about metro.config.js. @benjamn in #9716

• Handle falsy incoming data more gracefully in offetLimitPagination().merge function. @shobhitsharma in #9705

What's Changed (auto-generated by GitHub)

• Poll interval docs update by @jpvajda in https://github.com/apollographql/apollo-client/pull/9687
• [docs] Fix markdown bug in rest link by @ryanrhee in https://github.com/apollographql/apollo-client/pull/9698
• Internalize useSyncExternalStore shim, for more control than use-sync-external-store provides by @benjamn in https://github.com/apollographql/apollo-client/pull/9675
• Guarantee Concast cleanup without Observable cancelled prematurely rejection by @benjamn in https://github.com/apollographql/apollo-client/pull/9701
• docs: fix code snippet by @santiph in https://github.com/apollographql/apollo-client/pull/9703
• Update example headers with authentication by @theill in https://github.com/apollographql/apollo-client/pull/9621
• Fix a misplaced semicolon by @mlocher in https://github.com/apollographql/apollo-client/pull/9498
• Correct GraphQL variable name "text" to "type" by @FumioNonaka-ksj in https://github.com/apollographql/apollo-client/pull/9529
• Add apollo-multi-endpoint-link to community links by @jean9696 in https://github.com/apollographql/apollo-client/pull/9301
• readQuery clarification by @avinoamsn in https://github.com/apollographql/apollo-client/pull/9195
• Update authentication.mdx by @volokolamskspb in https://github.com/apollographql/apollo-client/pull/8630
• Add apollo-link-observable to community links by @dragozin in https://github.com/apollographql/apollo-client/pull/8234
• apollo-codegen is deprecated, but the tooling documentation still suggests it by @krainboltgreene in https://github.com/apollographql/apollo-client/pull/7517
• chore: corrected body params by @jpvajda in https://github.com/apollographql/apollo-client/pull/9711
• useSyncExternalStore refinements by @benjamn in https://github.com/apollographql/apollo-client/pull/9709
• Help React Native import @apollo/client/main.cjs and other CommonJS bundles by @benjamn in https://github.com/apollographql/apollo-client/pull/9716
• Revamping the "Why Apollo Client" article by @rkoron007 in https://github.com/apollographql/apollo-client/pull/9719
• Fix useSubscription bug in React v18 StrictMode (#9664) by @kazekyo in https://github.com/apollographql/apollo-client/pull/9707

New Contributors

• @ryanrhee made their first contribution in https://github.com/apollographql/apollo-client/pull/9698
• @santiph made their first contribution in https://github.com/apollographql/apollo-client/pull/9703
• @theill made their first contribution in https://github.com/apollographql/apollo-client/pull/9621
• @mlocher made their first contribution in https://github.com/apollographql/apollo-client/pull/9498
• @FumioNonaka-ksj made their first contribution in https://github.com/apollographql/apollo-client/pull/9529
• @jean9696 made their first contribution in https://github.com/apollographql/apollo-client/pull/9301
• @avinoamsn made their first contribution in https://github.com/apollographql/apollo-client/pull/9195
• @volokolamskspb made their first contribution in https://github.com/apollographql/apollo-client/pull/8630
• @dragozin made their first contribution in https://github.com/apollographql/apollo-client/pull/8234
• @krainboltgreene made their first contribution in https://github.com/apollographql/apollo-client/pull/7517
• @kazekyo made their first contribution in https://github.com/apollographql/apollo-client/pull/9707

Full Changelog: https://github.com/apollographql/apollo-client/compare/v3.6.3...v3.6.4