Obtaining transformation rules

[chibinz]

Hi,

First of all really cool project!

I was trying use comby-decomposer for fuzzing. But the server printed out the following logs when I ran it together with afl-compiler-fuzzer. Main issue seems to be server.js trying to reference a rules folder containing toml files, preventing it from doing any meaningful mutations.

transforming... 
transforming:  stall(module,"xuxu")

picked mutation:  undefined
bizarre error:  TypeError: Cannot read properties of undefined (reading 'match')
    at transformSource (/nix/store/9sim7x18ljx73viplcfn0iqvlp700xbj-comby-decomposer/bin/server.js:126:45)
    at mutate (/nix/store/9sim7x18ljx73viplcfn0iqvlp700xbj-comby-decomposer/bin/server.js:193:12)
    at /nix/store/9sim7x18ljx73viplcfn0iqvlp700xbj-comby-decomposer/bin/server.js:198:12
    at Layer.handle éas handleèrequestê (/nix/store/v9wahx2b4427p96l79scyqryfkhwgmnn-express-4.18.2/lib/nodeèmodules/express/lib/router/layer.js:95:5)
    at next (/nix/store/v9wahx2b4427p96l79scyqryfkhwgmnn-express-4.18.2/lib/nodeèmodules/express/lib/router/route.js:144:13)
    at Route.dispatch (/nix/store/v9wahx2b4427p96l79scyqryfkhwgmnn-express-4.18.2/lib/nodeèmodules/express/lib/router/route.js:114:3)
    at Layer.handle éas handleèrequestê (/nix/store/v9wahx2b4427p96l79scyqryfkhwgmnn-express-4.18.2/lib/nodeèmodules/express/lib/router/layer.js:95:5)
    at /nix/store/v9wahx2b4427p96l79scyqryfkhwgmnn-express-4.18.2/lib/nodeèmodules/express/lib/router/index.js:284:15
    at Function.processèparams (/nix/store/v9wahx2b4427p96l79scyqryfkhwgmnn-express-4.18.2/lib/nodeèmodules/express/lib/router/index.js:346:12)
    at next (/nix/store/v9wahx2b4427p96l79scyqryfkhwgmnn-express-4.18.2/lib/nodeèmodules/express/lib/router/index.js:280:10)
picked mutation:  undefined

...
no mutation with matches

I wonder if it is possible to provide a format specification or share some example rules files in the repo? Thanks!