fixed undefined timeout value bug

Author: nitin42

src/extension/components/ReactPerfDevtool.js

@@ -29,7 +29,7 @@ let queries = {
         }`
 }
 
-const sleep = ms => new Promise(resolve => setTimeout(resolve, ms))
+const sleep = timeout => new Promise(resolve => setTimeout(resolve, timeout))
 
 /**
   This is the main component that renders the table, containing information about
@@ -59,16 +59,6 @@ export class ReactPerfDevtool extends React.Component {
     }
   }
 
-  componentWillMount() {
-    // When the devtool is launched first, measures may not be available.
-    // Reload the window again to get the new measures and then display them.
-    // Why ? We rely on the observer hook that the user has installed in his/her project.
-    // This chrome plugin is just way to interpret the results derived from the observer's API
-    if (store.length === 0) {
-      this.reloadInspectedWindow()
-    }
-  }
-
   componentDidMount() {
     // Show the loader while the measures get resolved.
     // showChart, when set to true, render the canvas required for Chart.js.
@@ -77,7 +67,7 @@ export class ReactPerfDevtool extends React.Component {
     // Defer the initialization of the extension until the application loads. Why ?
     // Because some of the applications are huge in size and may take a lot of time to load.
     // If the extension initialization process kicks-in before the app loads, we are trapped inside the error state.
-    // With this, users can configure a timeout value for initialization of the extension using the observer hook
+    // With this, users can configure a timeout value for initialization of the extension using the observer hook like this `registerObserver({ timeout: 4000 })`
     // Default value for the timeout is 2 sec.
 
     // We need to resolve the promise after one sec. to make sure we have the updated __REACT_PERF_DEVTOOL_GLOBAL_STORE__ object otherwise we might end up with null
@@ -88,7 +78,7 @@ export class ReactPerfDevtool extends React.Component {
           return
         }
 
-        // This is also backward compatible with older versions of observer hook
+        // This is also backward compatible with older versions of observer hook (for versions <= @3.0.8)
         this.timer = setInterval(
           () => this.getMeasuresLength(),
           timeout !== undefined ? JSON.parse(timeout) : 2000