(see https://mdxjs.com/migrating/v3/ on how to migrate)

Change

• e08b7596 5afa48e6 Change to require Node 16
• 5a13d73b Change to use export maps
• cbc2822f Update unified, types, plugins, etc
• 96b51f93 Remove inferral of development from NODE_ENV

Change (unlikely to affect you)

• c961af80 Remove useDynamicImport option
• 9cb26fd1 @mdx-js/register: remove package
• 0d1558a3 @mdx-js/esbuild: remove experimental allowDangerousRemoteMdx
• 0f62bce9 @mdx-js/node-loader: remove fixRuntimeWithoutExportMap
• 4f924227 @mdx-js/preact: remove deprecated MDXContext, withMDXComponents
• a362bb43 @mdx-js/react: remove deprecated MDXContext, withMDXComponents

Add

• e12f3079 Add support for passing baseUrl when running
• 2c511a40 Add support for baseUrl as a URL
• 1863914c Add deprecation warning for classic runtime
• a34177c3 Add support for ES2024 in MDX, adjacent JSX and expression blocks
• 44fd9cac Add support for await in MDX
• 3a7f1947 Add tableCellAlignToStyle option, to use align
• fdfe17b8 @mdx-js/rollup: add support for Vite development mode by @remcohaszing in https://github.com/mdx-js/mdx/pull/2376

Misc

• f48d038b Remove unneeded pragma comment after transform
• 8f3b2920 Add a use strict directive to function bodies
• 172e5190 @mdx-js/react: fix to classify @types/react as a peer dependency by @remcohaszing in https://github.com/mdx-js/mdx/pull/2281
• a7bd79bb Refactor output to immediately export default
• e525db9b dae82ae4 Refactor some errors
• ce173f28 Refactor to add types for JSX runtimes
• 8a563128 Refactor output to use spread, not Object.assign by @remcohaszing in https://github.com/mdx-js/mdx/pull/2328
• 825717fd Refactor to sort default components by @remcohaszing in https://github.com/mdx-js/mdx/pull/2318
• d8a62d20 Add missing type dependencies by @arcanis in https://github.com/mdx-js/mdx/pull/2256

Docs

• a9f0c046 Add guide on injecting components
• 24e3d8d1 Add compat sections to readmes
• 30e4a5d5 Add sponsor
• 07503a5f Update link to KaTeX CSS in docs by @victor23k in https://github.com/mdx-js/mdx/pull/2360
• 74aee569 bc1d9e56 765310ca 6d1e64d9 Refactor docs
• 7fd1d9a4 Fix docs on how to use solid by @BeiyanYunyi in https://github.com/mdx-js/mdx/pull/2300
• 4129f90e Fix a couple typos by @deining in https://github.com/mdx-js/mdx/pull/2266
• bb902f83 Fix typo by @ChristianMurphy in https://github.com/mdx-js/mdx/pull/2380

Site

• 78a1eb52 Add v3 blog post
• 2b1948c0 Add v3 migration guide
• d6bb70ca Add improved error display in playground
• 89097e4c Remove unmaintained dev-dependency
• 3e23ba90 Add more options to playground
• d92128ba Fix links in docs
• ab3aa966 Add GitHub pages by @remcohaszing in https://github.com/mdx-js/mdx/pull/2377
• a2c86936 Fix site by @wooorm in https://github.com/mdx-js/mdx/pull/2358
• dbe9f44b Fix playground AST views w/ clone by @Jokcy in https://github.com/mdx-js/mdx/pull/2315
• 7504cfb8 Add more options to playground, directives, format, etc by @slorber in https://github.com/mdx-js/mdx/pull/2295
• 57301dfa Add resizable editor/layout to playground by @slorber in https://github.com/mdx-js/mdx/pull/2296
• 9eb747d6 Add info on how to build site locally by @slorber in https://github.com/mdx-js/mdx/pull/2297

Full Changelog: https://github.com/mdx-js/mdx/compare/2.3.0...3.0.0