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Static types in Starlark
A scheduled Google Bazel-team talk presents the optional static type-checking work planned for Bazel 10's Starlark interpreter.
The official abstract says the Bazel team at Google has worked on optional static type checking for the past year and plans to launch it in Bazel 10.
Building a Build System: Bazel reaches Beta
Google publicly stated in 2015 that Bazel built most software in its massive shared source repository.
The Bazel team described the system as building the majority of software in Google's shared repository.