diff --git a/tools/cpp/emscripten/BUILD b/tools/cpp/emscripten/BUILD
new file mode 100644
index 0000000..dd304e1
--- /dev/null
+++ b/tools/cpp/emscripten/BUILD
@@ -0,0 +1,38 @@
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "all",
+    srcs = [
+        "emar.sh",
+        "emcc.sh",
+        ":emscripten_cache_content",
+        "@emscripten_clang//:all",
+        "@emscripten_toolchain//:all",
+        "@nodejs//:bin/node",
+    ],
+)
+
+# TODO(james): There is a set of static files that emscripten will always
+# attempt to either rebuild or source from a cache. Ideally, we would make
+# the build of these files part of the normal build process; however, the
+# emscripten compiler handles sandboxing poorly for these files and so it
+# is simplest to just manually run emscripten outside of the sandbox and
+# copy over the cache folder for now.
+filegroup(
+    name = "emscripten_cache_content",
+    srcs = glob(["emscripten_cache/**/*"]),
+)
+
+cc_toolchain(
+    name = "cc_emscripten",
+    all_files = ":all",
+    compiler_files = ":all",
+    cpu = "web",
+    dwp_files = ":empty",
+    dynamic_runtime_libs = [":empty"],
+    linker_files = ":all",
+    objcopy_files = ":empty",
+    static_runtime_libs = [":empty"],
+    strip_files = ":empty",
+    supports_param_files = 0,
+)