1 files changed, 50 insertions, 0 deletions
diff --git a/tools/eslint/node_modules/escope/node_modules/es6-map/node_modules/event-emitter/unify.js b/tools/eslint/node_modules/escope/node_modules/es6-map/node_modules/event-emitter/unify.js
new file mode 100644
index 0000000000..c6a858a0be
--- /dev/null
+++ b/tools/eslint/node_modules/escope/node_modules/es6-map/node_modules/event-emitter/unify.js
@@ -0,0 +1,50 @@
+'use strict';
+
+var forEach    = require('es5-ext/object/for-each')
+  , validValue = require('es5-ext/object/valid-object')
+
+  , push = Array.prototype.apply, defineProperty = Object.defineProperty
+  , create = Object.create, hasOwnProperty = Object.prototype.hasOwnProperty
+  , d = { configurable: true, enumerable: false, writable: true };
+
+module.exports = function (e1, e2) {
+	var data;
+	(validValue(e1) && validValue(e2));
+	if (!hasOwnProperty.call(e1, '__ee__')) {
+		if (!hasOwnProperty.call(e2, '__ee__')) {
+			d.value = create(null);
+			defineProperty(e1, '__ee__', d);
+			defineProperty(e2, '__ee__', d);
+			d.value = null;
+			return;
+		}
+		d.value = e2.__ee__;
+		defineProperty(e1, '__ee__', d);
+		d.value = null;
+		return;
+	}
+	data = d.value = e1.__ee__;
+	if (!hasOwnProperty.call(e2, '__ee__')) {
+		defineProperty(e2, '__ee__', d);
+		d.value = null;
+		return;
+	}
+	if (data === e2.__ee__) return;
+	forEach(e2.__ee__, function (listener, name) {
+		if (!data[name]) {
+			data[name] = listener;
+			return;
+		}
+		if (typeof data[name] === 'object') {
+			if (typeof listener === 'object') push.apply(data[name], listener);
+			else data[name].push(listener);
+		} else if (typeof listener === 'object') {
+			listener.unshift(data[name]);
+			data[name] = listener;
+		} else {
+			data[name] = [data[name], listener];
+		}
+	});
+	defineProperty(e2, '__ee__', d);
+	d.value = null;
+};