Add done event

Author: daniel-bryant

index.d.ts

@@ -1,4 +1,4 @@
-export type BuiltInEventType = 'open' | 'message' | 'error' | 'close';
+export type BuiltInEventType = 'open' | 'message' | 'error' | 'done' | 'close';
 export type EventType<E extends string = never> = E | BuiltInEventType;
 
 export interface MessageEvent {
@@ -12,6 +12,10 @@ export interface OpenEvent {
   type: 'open';
 }
 
+export interface DoneEvent {
+  type: 'done';
+}
+
 export interface CloseEvent {
   type: 'close';
 }
@@ -55,6 +59,7 @@ export interface EventSourceOptions {
 type BuiltInEventMap = {
   'message': MessageEvent,
   'open': OpenEvent,
+  'done': DoneEvent,
   'close': CloseEvent,
   'error': ErrorEvent | TimeoutEvent | ExceptionEvent,
 };

src/EventSource.js

@@ -24,6 +24,7 @@ class EventSource {
       open: [],
       message: [],
       error: [],
+      done: [],
       close: [],
     };
 
@@ -115,6 +116,7 @@ class EventSource {
           this._handleEvent(xhr.responseText || '');
 
           if (xhr.readyState === XMLHttpRequest.DONE) {
+            this.dispatch('done', { type: 'done' });
             this._logDebug('[EventSource][onreadystatechange][DONE] Operation done.');
             this._pollAgain(this.interval, false);
           }