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+#!/usr/bin/env python
+"""
+gn can only run python scripts.
+
+Generates flatbuffer TypeScript code.
+"""
+import subprocess
+import sys
+import os
+import shutil
+import util
+
+# TODO(ry) Ideally flatc output files should be written into target_gen_dir, but
+# its difficult to get this working in a way that parcel can resolve their
+# location. (Parcel does not support NODE_PATH.) Therefore this hack: write the
+# generated msg_generated.ts outputs into the js/ folder, and we check them into
+# the repo. Hopefully this hack can be removed at some point. If msg.fps is
+# changed, commit changes to the generated JS file.
+
+src = sys.argv[1]
+dst = sys.argv[2]
+stamp_file = sys.argv[3]
+
+shutil.copyfile(src, dst)
+
+util.touch(stamp_file)