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

If you are a plugin developer, please try this version and send us your feedback!

Full Changelog: https://github.com/prettier/prettier/compare/2.7.1...3.0.0-alpha.0