GWT project build settings

Hello all.

I'm discovering GWT source code now and trying to understand it's build-system mechanism.

F.e. I see two files:
GWT/dev/BUILD - a Bazel build file

and

GWT/dev/build.xml - an ANT build file

But it seems for me that GWT build is performed by ANT fully.
Can anyone provide me with some explanation about mix of these two build system in one project?

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