How to reobfuscate modified code in Fabric mappings?

[RadBe]

I want to refactor the server code without using mixins. In Forge, I simply edited the file projects\forge\src\main\java\net\minecraft\server\MinecraftServer.java and moved the result into the server file. I tried to run the command "gradlew reobfuscate" in MCP, but it does not create classes like aa.class.