What is the best C# "codemod" engine out there?

[alexbit-codemod]

Hey everyone!

Is there any tool (maybe Roslynator is the closest to what I'm looking for) to help C# devs easily (maybe in a declarative way) create a script to detect certain patterns and transform it to something else (codemod) so they can do their mass refactoring, migrations, and upgrades easier?

in JS/TS world we have: https://github.com/facebook/jscodeshift
and popular frameworks (e.g. Material UI) create codemods for their consumers to run and almost automatically upgrade their dependencies (see these for MUI v4 to v5 upgrade.)

there are many other codemod engines out there.
LibCST for Python
openrewrite/rewrite for java
Uber's Piranha (for many languages)
JScodeshit, or Putout for JS/TS

[josefpihrt]

Hi,

Roslynator command line tool can be used for this purpose (namely roslynator fix command) (https://github.com/JosefPihrt/Roslynator/blob/main/docs/cli/fix-command.md).

Also, dotnet format tool can be used (https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-format).

[alexbit-codemod]

thank you. do you know of any sample ruleset that helps with the upgrade of a popular c# framework from one version to another? i just want to find some existing code transformations rules... how to define a code patterns and how to replace it with something else.

[keshavkaul]

@alexbit-codemod were you able to find a solution?

[alexbit-codemod]

no but ive learned that you can easily add support for any languages to Uber's Piranha. in what capacity are you interested in C# codemod engine? if you wanna contributes to Uber's codebase i have connections and guidance to add support for C#. its pretty straightforward. you can ping me here: https://go.codemod.com/slack