Rename EventEmitter2 to EventEmitter

Fixes #2029

src/common/EventEmitter.test.ts

@@ -0,0 +1,31 @@
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { assert } from 'chai';
+import { EventEmitter } from 'common/EventEmitter';
+
+describe('EventEmitter', () => {
+  it('should fire listeners multiple times', () => {
+    const order: string[] = [];
+    const emitter = new EventEmitter<number>();
+    emitter.event(data => order.push(data + 'a'));
+    emitter.event(data => order.push(data + 'b'));
+    emitter.fire(1);
+    emitter.fire(2);
+    assert.deepEqual(order, [ '1a', '1b', '2a', '2b' ]);
+  });
+
+  it('should not fire listeners once disposed', () => {
+    const order: string[] = [];
+    const emitter = new EventEmitter<number>();
+    emitter.event(data => order.push(data + 'a'));
+    const disposeB = emitter.event(data => order.push(data + 'b'));
+    emitter.event(data => order.push(data + 'c'));
+    emitter.fire(1);
+    disposeB.dispose();
+    emitter.fire(2);
+    assert.deepEqual(order, [ '1a', '1b', '1c', '2a', '2c' ]);
+  });
+});