with_cfg: Making transitions more accessible
summary
with_cfg is a Starlark library that wraps existing Bazel rules to apply option transitions with minimal boilerplate, producing new rules like cc_asan_test and java_21_library that build their deps with specific flags while keeping other deps unchanged. It provides builder methods like extend and reset to append COPT/LINKOPT or exclude attributes, supports selects, requires a top‑level original-settings target, and works on Bazel 6.4+.
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