fix(types): Ensure library is exported on this to work in both WebWorker and Window global scopes

Author: phamann

polyfill/index.ts

@@ -1,3 +1,3 @@
 import PerformanceObserver from "../src/index";
-const ctx = window || self;
+const ctx = self;
 if (!ctx.PerformanceObserver) ctx.PerformanceObserver = PerformanceObserver;

src/index.ts

@@ -1,6 +1,6 @@
 /* global PerformanceObserver */
 import PollingPerformanceObserver from "./observer";
 const isSupported =
-  "PerformanceObserver" in window && typeof PerformanceObserver === "function";
+  "PerformanceObserver" in self && typeof PerformanceObserver === "function";
 
 export default isSupported ? PerformanceObserver : PollingPerformanceObserver;

src/task-queue.ts

@@ -11,7 +11,7 @@ class PollingPerformanceObserverTaskQueue {
     registeredObservers = new Set(),
     processedEntries = new Set(),
     interval = 100,
-    context = window || self
+    context = self
   }: PerformanceObserverTaskQueueOptions = {}) {
     this.registeredObservers = registeredObservers;
     this.processedEntries = processedEntries;

webpack.common.js

@@ -32,6 +32,7 @@ module.exports = {
     library: 'PerformanceOberserverPolyfill',
     libraryTarget: 'umd',
     filename: 'index.js',
-    path: path.resolve(__dirname, 'dist')
+    path: path.resolve(__dirname, 'dist'),
+    globalObject: 'this'
   }
 };