diff --git a/codecs/mozjpeg/Makefile b/codecs/mozjpeg/Makefile
index ea0e34b6..0ba09a10 100644
--- a/codecs/mozjpeg/Makefile
+++ b/codecs/mozjpeg/Makefile
@@ -11,14 +11,21 @@ $(filter enc/%,$(OUT_JS)): enc/mozjpeg_enc.cpp
 
 %.js:
 	$(CXX) \
-		-I ${MOZJPEG}/include \
-		-L ${MOZJPEG}/lib \
-		${CXXFLAGS} \
-		${LDFLAGS} \
-		--bind \
+		-O3 \
+		-flto \
+		-s FILESYSTEM=0 \
+		-s PTHREAD_POOL_SIZE=navigator.hardwareConcurrency \
+		-s ALLOW_MEMORY_GROWTH=1 \
+		-s TEXTDECODER=2 \
+		-s NODEJS_CATCH_EXIT=0 -s NODEJS_CATCH_REJECTION=0 \
 		-s ENVIRONMENT=$(ENVIRONMENT) \
 		-s EXPORT_ES6=1 \
+		-lembind \
+		${CXXFLAGS} \
+		${LDFLAGS} \
 		-o $@ \
+		-I ${MOZJPEG}/include \
+		-L ${MOZJPEG}/lib \
 		-ljpeg \
 		${MOZJPEG}/lib/rdswitch.o \
 		$+
diff --git a/codecs/mozjpeg/enc/mozjpeg_enc.d.ts b/codecs/mozjpeg/enc/mozjpeg_enc.d.ts
new file mode 100644
index 00000000..3c730ae3
--- /dev/null
+++ b/codecs/mozjpeg/enc/mozjpeg_enc.d.ts
@@ -0,0 +1,37 @@
+export const enum MozJpegColorSpace {
+  GRAYSCALE = 1,
+  RGB,
+  YCbCr,
+}
+
+export interface EncodeOptions {
+  quality: number;
+  baseline: boolean;
+  arithmetic: boolean;
+  progressive: boolean;
+  optimize_coding: boolean;
+  smoothing: number;
+  color_space: MozJpegColorSpace;
+  quant_table: number;
+  trellis_multipass: boolean;
+  trellis_opt_zero: boolean;
+  trellis_opt_table: boolean;
+  trellis_loops: number;
+  auto_subsample: boolean;
+  chroma_subsample: number;
+  separate_chroma_quality: boolean;
+  chroma_quality: number;
+}
+
+export interface MozJPEGModule extends EmscriptenWasm.Module {
+  encode(
+    data: BufferSource,
+    width: number,
+    height: number,
+    options: EncodeOptions,
+  ): Uint8Array;
+}
+
+declare var moduleFactory: EmscriptenWasm.ModuleFactory<MozJPEGModule>;
+
+export default moduleFactory;
diff --git a/codecs/mozjpeg/flake.nix b/codecs/mozjpeg/flake.nix
index d680a11e..9fb00e60 100644
--- a/codecs/mozjpeg/flake.nix
+++ b/codecs/mozjpeg/flake.nix
@@ -20,12 +20,12 @@
         pkgs = nixpkgs.legacyPackages.${system};
       in
       with pkgs;
-      {
+      rec {
         packages = rec {
           default = mozjpeg-squoosh;
           mozjpeg-squoosh = stdenv.mkDerivation {
             name = "mozjpeg-squoosh";
-            src = ./.;
+            src = lib.cleanSource ./.;
             nativeBuildInputs = [
               emscripten
               mozjpeg
@@ -38,7 +38,7 @@
             '';
             installPhase = ''
               mkdir -p $out
-              cp enc/*.{wasm,js} $out
+              cp -r enc $out
             '';
           };
           mozjpeg = stdenv.mkDerivation {
@@ -77,14 +77,15 @@
             dontFixup = true;
           };
           installScript = writeShellScriptBin "install.sh" ''
-            ${pkgs.coreutils}/bin/mkdir build
-            ${pkgs.coreutils}/bin/cp ${mozjpeg-squoosh}/* build/
+            ${pkgs.coreutils}/bin/rm -rf build
+            ${pkgs.coreutils}/bin/mkdir -p build
+            ${pkgs.rsync}/bin/rsync --chmod=u+w -r ${mozjpeg-squoosh}/* build/
           '';
         };
         apps = {
           install = {
             type = "app";
-            # program = "
+            program = "${packages.installScript}/bin/install.sh";
           };
         };
       }
diff --git a/codecs/mozjpeg/package-lock.json b/codecs/mozjpeg/package-lock.json
deleted file mode 100644
index a6f8fa4f..00000000
--- a/codecs/mozjpeg/package-lock.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-  "name": "mozjpeg_enc",
-  "lockfileVersion": 1
-}
diff --git a/codecs/mozjpeg/package.json b/codecs/mozjpeg/package.json
deleted file mode 100644
index 37fdf439..00000000
--- a/codecs/mozjpeg/package.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "scripts": {
-    "build": "../build-cpp.sh"
-  }
-}
diff --git a/src/features/encoders/mozJPEG/shared/meta.ts b/src/features/encoders/mozJPEG/shared/meta.ts
index 3bfbae6c..fae306a9 100644
--- a/src/features/encoders/mozJPEG/shared/meta.ts
+++ b/src/features/encoders/mozJPEG/shared/meta.ts
@@ -13,7 +13,7 @@
 import {
   EncodeOptions,
   MozJpegColorSpace,
-} from 'codecs/mozjpeg/enc/mozjpeg_enc';
+} from 'codecs/mozjpeg/build/enc/mozjpeg_enc';
 export { EncodeOptions, MozJpegColorSpace };
 
 export const label = 'MozJPEG';
diff --git a/src/features/encoders/mozJPEG/worker/mozjpegEncode.ts b/src/features/encoders/mozJPEG/worker/mozjpegEncode.ts
index 949999a9..017909b6 100644
--- a/src/features/encoders/mozJPEG/worker/mozjpegEncode.ts
+++ b/src/features/encoders/mozJPEG/worker/mozjpegEncode.ts
@@ -10,7 +10,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import mozjpeg_enc, { MozJPEGModule } from 'codecs/mozjpeg/enc/mozjpeg_enc';
+import mozjpeg_enc, {
+  MozJPEGModule,
+} from 'codecs/mozjpeg/build/enc/mozjpeg_enc';
 import { EncodeOptions } from '../shared/meta';
 import { initEmscriptenModule } from 'features/worker-utils';