diff --git a/tools/cpp/emscripten/emar.sh b/tools/cpp/emscripten/emar.sh
new file mode 100755
index 0000000..a94fb0b
--- /dev/null
+++ b/tools/cpp/emscripten/emar.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+# Originally sourced from https://github.com/ribrdb/rules_emscripten
+set -euo pipefail
+EM_CONFIG="LLVM_ROOT='external/emscripten_clang';"
+EM_CONFIG+="EMSCRIPTEN_NATIVE_OPTIMIZER='external/emscripten_clang/optimizer';"
+EM_CONFIG+="BINARYEN_ROOT='external/emscripten_clang/binaryen';"
+EM_CONFIG+="NODE_JS='external/nodejs/bin/node';"
+EM_CONFIG+="EMSCRIPTEN_ROOT='external/emscripten_toolchain';"
+EM_CONFIG+="SPIDERMONKEY_ENGINE='';"
+EM_CONFIG+="V8_ENGINE='';"
+EM_CONFIG+="TEMP_DIR='tmp';"
+EM_CONFIG+="COMPILER_ENGINE=NODE_JS;"
+EM_CONFIG+="JS_ENGINES=[NODE_JS];"
+export EM_CONFIG
+
+export EM_EXCLUSIVE_CACHE_ACCESS=1
+export EMCC_SKIP_SANITY_CHECK=1
+export EMCC_WASM_BACKEND=0
+export EMMAKEN_NO_SDK=1
+
+python external/emscripten_toolchain/emar.py "$@"