If you are a plugin developer, please try this version and send us feedback! Feel free to ping @fisker if you have any questions about v3 migration.

Breaking change since v3.0.0-alpha.0

• Package file structure updated, exports field added to package.json
  https://unpkg.com/browse/prettier@3.0.0-alpha.1/

Changes since Prettier v2

Highlights

• Support plugins in ESM
• Support config files in ESM
• Support plugins with async parsers

Breaking changes

• [BREAKING] The minimal required Node.js version is v14
• [BREAKING] All public APIs are asynchronous
• [BREAKING] Change default value of trailingComma to "all"

Plugin system

• [BREAKING] the embed method of a printer has now to match a completely new signature, added getVisitorKeys method
• [BREAKING] The second argument parsers passed to parsers.parse has been removed
• [BREAKING] prettier.doc.builders.concat has been removed
• [BREAKING] textToDoc trims trailing hard lines now

Full Changelog: 2.7.1...3.0.0-alpha.1