Add in-process (FFI) transport for the Node.js SDK

.github/workflows/nodejs-sdk-tests.yml

@@ -31,14 +31,15 @@ permissions:
 
 jobs:
   test:
-    name: "Node.js SDK Tests"
+    name: "Node.js SDK Tests (${{ matrix.os }}, ${{ matrix.transport }})"
     if: github.event.repository.fork == false
     env:
       POWERSHELL_UPDATECHECK: Off
     strategy:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
+        transport: ["default", "inprocess"]
     runs-on: ${{ matrix.os }}
     defaults:
       run:
@@ -75,6 +76,11 @@ jobs:
         if: runner.os == 'Windows'
         run: pwsh.exe -Command "Write-Host 'PowerShell ready'"
 
+      - name: Select inprocess transport
+        if: matrix.transport == 'inprocess'
+        run: |
+          echo "COPILOT_SDK_DEFAULT_CONNECTION=inprocess" >> "$GITHUB_ENV"
+
       - name: Run Node.js SDK tests
         env:
           COPILOT_HMAC_KEY: ${{ secrets.COPILOT_DEVELOPER_CLI_INTEGRATION_HMAC_KEY }}

dotnet/src/FfiRuntimeHost.cs

@@ -167,6 +167,9 @@ private static byte[] BuildArgvJson(string cliEntrypoint)
             }
             writer.WriteStringValue(cliEntrypoint);
             writer.WriteStringValue("--embedded-host");
+            // Pin the worker to the bundled pkg matching the loaded cdylib, instead of
+            // drifting to a newer version under the user's ~/.copilot/pkg (ABI skew).
+            writer.WriteStringValue("--no-auto-update");
             writer.WriteEndArray();
         }
         return stream.ToArray();

nodejs/package.json

@@ -57,6 +57,7 @@
     "license": "MIT",
     "dependencies": {
         "@github/copilot": "^1.0.70-0",
+        "koffi": "^3.1.0",
         "vscode-jsonrpc": "^8.2.1",
         "zod": "^4.3.6"
     },