by warrenseine

Prettier C# Plugin

207 Stars 7 Forks Last release: Not found MIT License 133 Commits 3 Releases

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Prettier C#

Prettier C# Plugin

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


Prettier C# adds C# support to the Prettier code formatter. Like Prettier, it is opinionated and restricts style options to a minimum. It runs where Prettier runs, including CI and pre-commit hooks.


Please note that this plugin is under active development, and might not be ready to run on production code yet. It will break your code.

Preview the result with this diff example.


yarn add --dev --exact prettier prettier-plugin-csharp


prettier --write "**/*.cs"

How it works

The plugin is written in JavaScript. It depends on the JavaScript port of ANTLR and relies on a fork of an unofficial C# 6 grammar from ANTLR. The grammar is precompiled to plain JavaScript and ready to use in the project.


Installing dependencies

Use your favorite Node package manager:


Updating the grammar

The grammar supports C# 6 as a baseline, and tries to catch up with recent additions. Contributions are welcome. To update the grammar:

  • Update
  • Ensure you have Java 8+ installed on your machine.
  • Fetch a local copy of ANTLR:
yarn fetch-antlr
  • Generate the JavaScript parser:
yarn generate-parser


The project is developed against a single grammar-complete regression test. There are no unit tests for the moment.

Run the test with:

yarn test

To test it out on an actual C# file:

  • Clone this repository.
  • Run
  • Run
    yarn prettier Your/File.cs
    to check the output.


      Warren Seine

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