2 files changed, 18 insertions, 8 deletions
diff --git a/js/os.ts b/js/os.ts
index 3f71c0e64..3344d1a51 100644
--- a/js/os.ts
+++ b/js/os.ts
@@ -5,14 +5,17 @@ import { assert } from "./util";
 import * as util from "./util";
 import { flatbuffers } from "flatbuffers";
 
-export function exit(exitCode = 0): void {
-  assert(false, "Not Implemented");
-  /*
-  pubInternal("os", {
-    command: fbs.Command.EXIT,
-    exitCode
-  });
-  */
+export function exit(exitCode = 0): never {
+  const builder = new flatbuffers.Builder();
+  fbs.Exit.startExit(builder);
+  fbs.Exit.addCode(builder, exitCode);
+  const msg = fbs.Exit.endExit(builder);
+  fbs.Base.startBase(builder);
+  fbs.Base.addMsg(builder, msg);
+  fbs.Base.addMsgType(builder, fbs.Any.Exit);
+  builder.finish(fbs.Base.endBase(builder));
+  deno.send(builder.asUint8Array());
+  throw Error("Unreachable");
 }
 
 export function codeFetch(
diff --git a/src/reply.cc b/src/reply.cc
index 007f2c68b..a6558890d 100644
--- a/src/reply.cc
+++ b/src/reply.cc
@@ -71,6 +71,13 @@ void deno_handle_msg_from_js(Deno* d, deno_buf buf) {
       break;
     }
 
+    case deno::Any_Exit: {
+      auto msg = base->msg_as_Exit();
+      uint32_t code = msg->code();
+      exit(code);
+      break;
+    }
+
     case deno::Any_NONE:
       CHECK(false && "Got message with msg_type == Any_NONE");
       break;