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,
+)
diff --git a/tools/cpp/emscripten/defs.bzl b/tools/cpp/emscripten/defs.bzl
new file mode 100644
index 0000000..721e895
--- /dev/null
+++ b/tools/cpp/emscripten/defs.bzl
@@ -0,0 +1,51 @@
+# Sourced from https://github.com/ribrdb/rules_emscripten/blob/master/toolchain/defs.bzl
+# TODO(james): Specialize this more for our purposes--e.g.,
+# we probably will only actually use one set of the possible options.
+def emcc_binary(name,
+                memory_init_file=0,
+                wasm=True,
+                worker=False,
+                linkopts=[],
+                **kwargs):
+    includejs = False
+    includehtml = False
+    linkopts = list(linkopts)
+    if name.endswith(".html"):
+        basename = name[:-5]
+        includehtml = True
+        includejs = True
+    elif name.endswith(".js"):
+        basename = name[:-3]
+        includejs = True
+    outputs = []
+    if includejs:
+        outputs.append(basename + ".js")
+        if wasm:
+            outputs.append(basename + ".wasm")
+        if memory_init_file:
+            outputs.append(basename + ".mem")
+        if worker:
+            outputs.append(basename + ".worker.js")
+            linkopts.append('--proxy-to-worker')
+
+    if includehtml:
+        outputs.append(basename + ".html")
+    if not wasm:
+        linkopts.append('-s WASM=0')
+        linkopts.append('--memory-init-file %d' % memory_init_file)
+    if includejs:
+        tarfile = name + ".tar"
+        # we'll generate a tarfile and extract multiple outputs
+        native.cc_binary(name=tarfile, linkopts=linkopts, restricted_to = ["//tools:web"], **kwargs)
+        native.genrule(
+            name="emcc_extract_" + tarfile,
+            srcs=[tarfile],
+            outs=outputs,
+            output_to_bindir=1,
+            testonly=kwargs.get('testonly'),
+            restricted_to = ["//tools:web"],
+            cmd="""
+          tar xf $< -C "$(@D)"/$$(dirname "%s")
+        """ % [outputs[0]])
+    else:
+        native.cc_binary(name=name, linkopts=linkopts, restricted_to = ["//tools:web"], **kwargs)
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 "$@"
diff --git a/tools/cpp/emscripten/emcc.sh b/tools/cpp/emscripten/emcc.sh
new file mode 100755
index 0000000..52ed893
--- /dev/null
+++ b/tools/cpp/emscripten/emcc.sh
@@ -0,0 +1,65 @@
+#!/bin/bash
+# Originally sourced from https://github.com/ribrdb/rules_emscripten
+set -euo pipefail
+EM_CONFIG="LLVM_ROOT='$(pwd -P)/external/emscripten_clang';"
+EM_CONFIG+="EMSCRIPTEN_NATIVE_OPTIMIZER='external/emscripten_clang/optimizer';"
+EM_CONFIG+="BINARYEN_ROOT='external/emscripten_clang/binaryen';"
+EM_CONFIG+="NODE_JS='$(pwd -P)/external/nodejs/bin/node';"
+EM_CONFIG+="EMSCRIPTEN_ROOT='external/emscripten_toolchain';"
+EM_CONFIG+="SPIDERMONKEY_ENGINE='';"
+EM_CONFIG+="V8_ENGINE='';"
+EM_CONFIG+="TEMP_DIR='tmp';"
+EM_CONFIG+="COMPILER_ENGINE=NODE_JS;"
+EM_CONFIG+="JS_ENGINES=[NODE_JS];"
+export EM_CONFIG
+
+export EM_EXCLUSIVE_CACHE_ACCESS=1
+export EMCC_SKIP_SANITY_CHECK=1
+# export EMCC_DEBUG=2
+export EMCC_WASM_BACKEND=0
+export EMMAKEN_NO_SDK=1
+
+mkdir -p "tmp/emscripten_cache"
+export EM_CACHE="$(pwd -P)/tmp/emscripten_cache"
+export EMCC_TEMP_DIR="$(pwd -P)/tmp"
+
+# Prepare the cache content so emscripten doesn't try to rebuild it all the time
+cache_source=tools/cpp/emscripten/emscripten_cache
+if [ -d toolchain/emscripten_cache ]; then
+  cache_source=toolchain/emscripten_cache
+elif [ -d external/rules_emscripten/toolchain/emscripten_cache ]; then
+  cache_source=external/rules_emscripten/toolchain/emscripten_cache
+fi
+(
+  cd tmp/emscripten_cache;
+  for n in "../../$cache_source"/*;do
+    ln -s "$n"
+  done
+)
+
+argv=("$@")
+tarfile=
+# Find the -o option, and strip the .tar from it.
+for (( i=0; i<$#; i++ )); do
+  if [[ "x${argv[i]}" == x-o ]]; then
+    arg=${argv[$((i+1))]}
+    if [[ "x$arg" == x*.tar ]];then
+        tarfile="$(cd $(dirname "$arg"); pwd -P)/$(basename "$arg")"
+        emfile="$(dirname "$arg")/$(basename $arg .tar)"
+        basearg="$(basename "$(basename "$(basename "$emfile" .js)" .html)" .wasm)"
+        baseout="$(dirname "$arg")/$basearg"
+        argv[$((i+1))]="$emfile"
+    fi
+  fi
+done
+python external/emscripten_toolchain/emcc.py "${argv[@]}"
+# Now create the tarfile
+shopt -s extglob
+if [ "x$tarfile" != x ]; then
+  outdir="$(dirname "$baseout")"
+  outbase="$(basename "$baseout")"
+  (
+      cd "$outdir";
+      tar cf "$tarfile" "$outbase."?(html|js|wasm|mem|data|worker.js)
+  )
+fi
diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/binaryen_tag_version_82.txt b/tools/cpp/emscripten/emscripten_cache/asmjs/binaryen_tag_version_82.txt
new file mode 100644
index 0000000..01e1f09
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/binaryen_tag_version_82.txt
@@ -0,0 +1 @@
+version_82
\ No newline at end of file
diff --git a/tools/cpp/emscripten/emscripten_cache/asmjs/generated_struct_info.json b/tools/cpp/emscripten/emscripten_cache/asmjs/generated_struct_info.json
new file mode 100644
index 0000000..1e636fd
--- /dev/null
+++ b/tools/cpp/emscripten/emscripten_cache/asmjs/generated_struct_info.json
@@ -0,0 +1 @@
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