https://github.com/pmndrs/jotai/blob/v3/docs/guides/migrating-to-v3.mdx

What's Changed

• [v3] drop old TS by @dai-shi in https://github.com/pmndrs/jotai/pull/3336
• [v3] drop UMD and SystemJS builds by @dai-shi in https://github.com/pmndrs/jotai/pull/3338
• [v3] drop old node by @dai-shi in https://github.com/pmndrs/jotai/pull/3339
• [v3] module-first package by @dai-shi in https://github.com/pmndrs/jotai/pull/3340
• [v3] drop CJS by @dai-shi in https://github.com/pmndrs/jotai/pull/3341
• [v3] use NODE_ENV directly by @dai-shi in https://github.com/pmndrs/jotai/pull/3342
• [v3] drop rollup by @dai-shi in https://github.com/pmndrs/jotai/pull/3344
• [v3] drop old React by @dai-shi in https://github.com/pmndrs/jotai/pull/3345
• [v3] es2020 target by @dai-shi in https://github.com/pmndrs/jotai/pull/3346
• [v3] drop atomFamily by @dai-shi in https://github.com/pmndrs/jotai/pull/3347
• [v3] drop loadable by @dai-shi in https://github.com/pmndrs/jotai/pull/3348
• [v3] drop jotai/babel by @dai-shi in https://github.com/pmndrs/jotai/pull/3349
• [v3] drop setSelf by @dai-shi in https://github.com/pmndrs/jotai/pull/3350
• [v3] useAtomValueRaw & useAtomValueRawSync by @dai-shi in https://github.com/pmndrs/jotai/pull/3351
• [v3] redesign buildingBlocks by @dai-shi in https://github.com/pmndrs/jotai/pull/3358
• [v3] migration guide by @dai-shi in https://github.com/pmndrs/jotai/pull/3359

Full Changelog: https://github.com/pmndrs/jotai/compare/v2.20.2...v3.0.0-alpha.0