Generate typed QX bindings and add source editing tools

quixos-package-helpers.nix

@@ -510,6 +510,20 @@ EOF
       '';
     };
 
+  # Language-neutral, offline schema compilation. Snapshot directories must be
+  # fixed Nix inputs matching the resource lock's complete dependency closure.
+  mkQxBindingSchema = { pkgs, protocol, src, repository, commit, resources ? [ ] }:
+    let
+      snapshots = pkgs.writeText "qx-binding-snapshots.json" (builtins.toJSON { inherit resources; });
+    in pkgs.runCommand "qx-binding-schema.json" { } ''
+      ${protocol}/bin/quixos-resource-compile \
+        --root ${src} --kind package \
+        --repository ${pkgs.lib.escapeShellArg repository} \
+        --commit ${pkgs.lib.escapeShellArg commit} \
+        --checkout-root "$TMPDIR/checkouts" \
+        --snapshot-map ${snapshots} --snapshot-only true --schema-out "$out" > /dev/null
+    '';
+
   mkCaminoTsYarnNixifyFlake =
     {
       inputs,
@@ -522,6 +536,9 @@ EOF
       nodejsAttr ? "nodejs_24",
       buildCommand ? "yarn build",
       buildEnv ? { },
+      # An exact, compiler-produced BindingSchema JSON artifact and a backend.
+      # Other language helpers can consume the same schema with their own generator/runtime.
+      bindings ? null,
       nativeBuildInputs ? [ ],
       devShellPackages ? [ ],
       devShellHook ? "",
@@ -560,6 +577,29 @@ EOF
               attrs
           );
 
+        bindingConfig = if bindings == null then null else callOption bindings;
+        bindingSchema = if bindingConfig == null then null else bindingConfig.schema or (mkQxBindingSchema {
+          inherit pkgs;
+          protocol = bindingConfig.generator;
+          src = packageRoot;
+          inherit (bindingConfig) repository commit;
+          resources = bindingConfig.resources or [ ];
+        });
+        bindingOutput = if bindingConfig == null then "src/gen/qx.ts" else bindingConfig.output or "src/gen/qx.ts";
+        bindingOptions = if bindingConfig == null then null else
+          pkgs.writeText "qx-typescript-options.json" (builtins.toJSON (bindingConfig.options or { }));
+        bindingCommand = if bindingConfig == null then "" else ''
+          mkdir -p ${lib.escapeShellArg (dirOf bindingOutput)}
+          ${bindingConfig.generator}/bin/quixos-codegen-ts \
+            ${lib.escapeShellArg (toString bindingSchema)} \
+            ${lib.escapeShellArg bindingConfig.packageRevisionId} \
+            ${lib.escapeShellArg bindingOutput} ${bindingOptions}
+        '';
+        generateBindings = pkgs.writeShellApplication {
+          name = "qx-generate-bindings";
+          text = bindingCommand;
+        };
+
         bundleConfig = if bundle == null then { } else bundle;
         bundleOutfile = bundleConfig.outfile or "server.mjs";
         bundlePlatform = bundleConfig.platform or "node";
@@ -634,6 +674,8 @@ EOF
             buildPhase = ''
               runHook preBuild
               ${exportsFor (callOption buildEnv)}
+              ${bindingCommand}
+              ${lib.optionalString (bindingConfig != null) "yarn exec tsc --noEmit"}
               ${buildCommand}
               ${bundleCommand}
               runHook postBuild
@@ -671,7 +713,8 @@ EOF
           packages = [
             nodejs
             project.yarn-freestanding
-          ] ++ callOption devShellPackages;
+          ] ++ lib.optional (bindingConfig != null) generateBindings ++ callOption devShellPackages;
+          # Explicit command keeps shell entry free of source mutations.
           shellHook = devShellHookBase + callOption devShellHook;
         };
       } // maybeServerOutputs
@@ -683,5 +726,6 @@ in
     mkTsPackageServer
     mkSchemaSupport
     mkCaminoSourcePackage
+    mkQxBindingSchema
     mkCaminoTsYarnNixifyFlake;
 }