Update plme.js

plme.js

@@ -1,16 +1,14 @@
 const timeline = [];
-let replaying = false;
-let startTime = 0;
 
 export function record(packet) {
   timeline.push(packet);
 }
 
-export function replay(callback) {
-  replaying = true;
-  startTime = performance.now();
+export function replay(cb) {
+  if (!timeline.length) return;
+  const t0 = timeline[0].timestamp;
 
-  timeline.forEach(pkt => {
-    setTimeout(() => callback(pkt), pkt.timestamp - timeline[0].timestamp);
+  timeline.forEach(p => {
+    setTimeout(() => cb(p), p.timestamp - t0);
   });
 }