Demo protobufs in deno2.

Adds deno_set_response() to allow stack allocated responses.

deno2/js/main.ts

@@ -4,11 +4,32 @@ import * as ts from "typescript";
 
 const globalEval = eval;
 const window = globalEval("this");
+
 window["denoMain"] = () => {
-  denoPrint("Hello world");
-  const msg = pb.Msg.fromObject({});
-  denoPrint(`msg.command: ${msg.command}`);
   denoPrint(`ts.version: ${ts.version}`);
-  denoPrint("Hello world from foo");
-  return "foo";
+  const res = denoPub("startDeno2", emptyArrayBuffer());
+  //denoPrint(`after`);
+  const resUi8 = new Uint8Array(res);
+  denoPrint(`before`);
+  const msg = pb.Msg.decode(resUi8);
+  denoPrint(`after`);
+  const {
+    startCwd: cwd,
+    startArgv: argv,
+    startDebugFlag: debugFlag,
+    startMainJs: mainJs,
+    startMainMap: mainMap
+  } = msg;
+  denoPrint(`cwd: ${cwd}`);
 };
+
+function typedArrayToArrayBuffer(ta: Uint8Array): ArrayBuffer {
+  return ta.buffer.slice(
+    ta.byteOffset,
+    ta.byteOffset + ta.byteLength
+  ) as ArrayBuffer;
+}
+
+function emptyArrayBuffer(): ArrayBuffer {
+  return typedArrayToArrayBuffer(new Uint8Array([]));
+}