From 406bf380c96b55d20ca36f00e937f94adb4e5dbf Mon Sep 17 00:00:00 2001
From: rlb <rbosetti@gmail.com>
Date: Mon, 4 Aug 2025 13:47:22 -0700
Subject: [PATCH] feat: RUNFILES_DIR compatibility

Add this environment variable in line with https://docs.google.com/document/d/e/2PACX-1vSDIrFnFvEYhKsCMdGdD40wZRBX3m3aZ5HhVj4CtHPmiXKDCxioTUbYsDydjKtFDAzER5eg7OjJWs3V/pub

For compatibility with existing users and workarounds, the variable is conditionally exported.
---
 js/private/js_binary.sh.tpl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/js/private/js_binary.sh.tpl b/js/private/js_binary.sh.tpl
index 969c0501b..9e30d2edc 100644
--- a/js/private/js_binary.sh.tpl
+++ b/js/private/js_binary.sh.tpl
@@ -150,6 +150,12 @@ trap _exit EXIT
 export RUNFILES
 JS_BINARY__RUNFILES="$RUNFILES"
 export JS_BINARY__RUNFILES
+# Set RUNFILES_DIR for compatibility with languages obeying the design laid out in
+# https://github.com/bazelbuild/bazel/issues/4460
+if [ -z "${RUNFILES_DIR:-}" ]; then
+    RUNFILES_DIR="$RUNFILES"
+fi
+export RUNFILES_DIR
 
 # ==============================================================================
 # Prepare to run main program