I used to work on Bazel and Starlark. In the past, I talked with engineers working on other build systems to aim for some compatibility. The was some interest (

I used to work on Bazel and Starlark. In the past, I talked with engineers working on other build systems to aim for some compatibility. The was some interest (even Microsoft people were interested to support Starlark rules in their tool), but it didn't work. On the BUILD file level, Buck is using the Starlark. Pants and Please are close enough that some tooling (e.g. buildifier) can be shared. But that's about it.