emscripten: add node dependencies for acorn-optimizer

pkgs/development/compilers/emscripten/default.nix

@@ -2,6 +2,7 @@
 , jre, binaryen
 , llvmPackages_11
 , symlinkJoin, makeWrapper
+, mkYarnModules
 }:
 
 stdenv.mkDerivation rec {
@@ -14,6 +15,14 @@ stdenv.mkDerivation rec {
     paths = with llvmPackages_11; [ clang-unwrapped lld llvm ];
   };
 
+  nodeModules = mkYarnModules {
+    name = "emscripten-node-modules-${version}";
+    inherit pname version;
+    packageJSON = ./package.json;
+    yarnLock = ./yarn.lock;
+    yarnNix = ./yarn.nix;
+  };
+
   src = fetchFromGitHub {
     owner = "emscripten-core";
     repo = "emscripten";
@@ -51,6 +60,7 @@ stdenv.mkDerivation rec {
     mkdir -p $out/bin
     for b in em++ em-config emar embuilder.py emcc emcmake emconfigure emlink.py emmake emranlib emrun emscons; do
       makeWrapper $appdir/$b $out/bin/$b \
+        --set NODE_PATH ${nodeModules}/node_modules \
         --set PYTHON ${python3}/bin/python
     done
   '';