diff --git a/main.ts b/main.ts
index a2a97c90a2..e8eb37856a 100644
--- a/main.ts
+++ b/main.ts
@@ -34,11 +34,13 @@ let startCalled = false;
     startCalled = true;
 
     const msg = pb.Msg.decode(payload);
-    const cwd = msg.startCwd;
-    const argv = msg.startArgv;
-    const debugFlag = msg.startDebugFlag;
-    const mainJs = msg.startMainJs;
-    const mainMap = msg.startMainMap;
+    const {
+      startCwd: cwd,
+      startArgv: argv,
+      startDebugFlag: debugFlag,
+      startMainJs: mainJs,
+      startMainMap: mainMap
+    } = msg;
 
     debug = debugFlag;
     util.log("start", { cwd, argv, debugFlag });
diff --git a/timers.ts b/timers.ts
index 136ae745cf..cddb859d9a 100644
--- a/timers.ts
+++ b/timers.ts
@@ -27,15 +27,14 @@ export function initTimers() {
 function onMessage(payload: Uint8Array) {
   const msg = pb.Msg.decode(payload);
   assert(msg.command === pb.Msg.Command.TIMER_READY);
-  const id = msg.timerReadyId;
-  const done = msg.timerReadyDone;
-  const timer = timers.get(id);
+  const { timerReadyId, timerReadyDone } = msg;
+  const timer = timers.get(timerReadyId);
   if (!timer) {
     return;
   }
   timer.cb(...timer.args);
-  if (done) {
-    timers.delete(id);
+  if (timerReadyDone) {
+    timers.delete(timerReadyId);
   }
 }