Make Wasm compilable

flake.nix

@@ -20,6 +20,10 @@
           rustToolchainDev = super.rust-bin.stable.latest.default.override {
             extensions = [ "rust-src" "rust-analyzer" ];
           };
+          rustToolchainDevWasm = super.rust-bin.stable.latest.default.override {
+            extensions = [ "rust-src" "rust-analyzer" ];
+            targets = [ "wasm32-unknown-unknown" ];
+          };
           rustToolchainNightly = super.rust-bin.selectLatestNightlyWith (toolchain:
             toolchain.default.override {
               extensions = [ "rust-src" "rust-analyzer" "miri" ];
@@ -38,12 +42,21 @@
       in
       {
         devShells = {
-          default = pkgs.mkShell {
+          default = pkgs.mkShell.override { stdenv = pkgs.clangMultiStdenv; } {
             nativeBuildInputs = nativeBuildInputs;
             buildInputs = buildInputs ++ (with pkgs; [
               rustToolchainDev
             ]);
           };
+          wasm-js = pkgs.mkShell.override { stdenv = pkgs.clangMultiStdenv; } {
+            nativeBuildInputs = nativeBuildInputs;
+            buildInputs = buildInputs ++ (with pkgs; [
+              wasm-pack
+              rustToolchainDevWasm
+            ]);
+            TARGET_CC = "${pkgs.clangMultiStdenv.cc}/bin/clang";
+            hardeningDisable = [ "all" ];
+          };
           # For use with Miri and stuff like it
           nightly = pkgs.mkShell {
             nativeBuildInputs = nativeBuildInputs;