Prettier Swift Plugin - WARNING: The AST parser is not stable yet
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🚧 Work in Progress! 🚧

Prettier Swift

Swift Plugin for the Opinionated Code Formatter

Gitter Travis npm version code style: prettier Follow+Prettier+on+Twitter

What does it do?

⚠️ Warning ⚠️ This plugin might eat your homework in its early stage. It also depends on Swift's lib/Syntax which is in flux. Please stage or commit your code before performing any in-place formatting.

You can check out how it formatted Artsy's Eidolon.


You need one of the following:

  1. A snapshot from March 30, 2018 or later,
  2. a recent manual build from Swift's master, or
  3. Swift 4.2 (once it's available as a beta or released completely).

Assuming you picked (1) please follow the installation instructions, which recommend updating your PATH at the end:

export PATH=/Library/Developer/Toolchains/${TOOLCHAIN}/usr/bin/:"${PATH}"

Alternatively you can pass the full path to the swiftc binary via the environment variable PRETTIER_SWIFT_SWIFTC:

export PRETTIER_SWIFT_SWIFTC=/Library/Developer/Toolchains/${TOOLCHAIN}/usr/bin/swiftc


If you're interested in contributing to the development of Prettier for Swift, you can follow the CONTRIBUTING guide from Prettier, as it all applies to this repository too.

To test it out on a Swift file:

  • Clone this repository.
  • Run yarn.
  • Create a file called test.swift.
  • Run yarn prettier test.swift to check the output.


yarn add --dev --exact prettier prettier/plugin-swift


prettier --write "**/*.swift"


Marcel Jackwerth