ref: Rewrite RequestBuffer using Array instead of Set for IE10/11

Author: kamilogorek

packages/core/src/requestbuffer.ts

@@ -1,7 +1,7 @@
 /** A simple queue that holds promises. */
 export class RequestBuffer<T> {
   /** Internal set of queued Promises */
-  private readonly buffer: Set<Promise<T>> = new Set();
+  private readonly buffer: Array<Promise<T>> = [];
 
   /**
    * Add a promise to the queue.
@@ -10,16 +10,29 @@ export class RequestBuffer<T> {
    * @returns The original promise.
    */
   public async add(task: Promise<T>): Promise<T> {
-    this.buffer.add(task);
-    task.then(() => this.buffer.delete(task)).catch(() => this.buffer.delete(task));
+    if (this.buffer.indexOf(task) === -1) {
+      this.buffer.push(task);
+    }
+    task.then(async () => this.remove(task)).catch(async () => this.remove(task));
     return task;
   }
 
+  /**
+   * Remove a promise to the queue.
+   *
+   * @param task Can be any Promise<T>
+   * @returns Removed promise.
+   */
+  public async remove(task: Promise<T>): Promise<T> {
+    const removedTask = this.buffer.splice(this.buffer.indexOf(task), 1)[0];
+    return removedTask;
+  }
+
   /**
    * This function returns the number of unresolved promises in the queue.
    */
   public length(): number {
-    return this.buffer.size;
+    return this.buffer.length;
   }
 
   /**
@@ -35,7 +48,7 @@ export class RequestBuffer<T> {
           resolve(false);
         }
       }, timeout);
-      Promise.all(this.buffer.values())
+      Promise.all(this.buffer)
         .then(() => {
           clearTimeout(capturedSetTimeout);
           resolve(true);