dart-sdk/build
..
config
dart
fuchsia
linux
mac
rust
sanitizers
secondary/third_party/android_tools
toolchain
win
.gitignore
detect_host_arch.py
executable_suffix.gni
gn_helpers.py
gn_run_binary.py
README.dart.md
vs_toolchain.py

This directory was taken from a snapshot of flutter/engine/src/build/.

The snapshot was taken with a recursive copy cp -R of the directory from the flutter repository.

The contents has now diverged significantly from Flutter, and is maintained independantly by the Dart team. It is used to support the GN build system.