1 files changed, 25 insertions, 0 deletions
diff --git a/web/src/js/stores/base.js b/web/src/js/stores/base.js
new file mode 100644
index 00000000..952fa847
--- /dev/null
+++ b/web/src/js/stores/base.js
@@ -0,0 +1,25 @@
+function EventEmitter() {
+    this.listeners = {};
+}
+EventEmitter.prototype.emit = function (event) {
+    if (!(event in this.listeners)) {
+        return;
+    }
+    var args = Array.prototype.slice.call(arguments, 1);
+    this.listeners[event].forEach(function (listener) {
+        listener.apply(this, args);
+    }.bind(this));
+};
+EventEmitter.prototype.addListener = function (event, f) {
+    this.listeners[event] = this.listeners[event] || [];
+    this.listeners[event].push(f);
+};
+EventEmitter.prototype.removeListener = function (event, f) {
+    if (!(event in this.listeners)) {
+        return false;
+    }
+    var index = this.listeners[event].indexOf(f);
+    if (index >= 0) {
+        this.listeners[event].splice(index, 1);
+    }
+};