1 files changed, 23 insertions, 0 deletions
diff --git a/node_modules/symbol-observable/lib/ponyfill.js b/node_modules/symbol-observable/lib/ponyfill.js
new file mode 100644
index 000000000..be68acaad
--- /dev/null
+++ b/node_modules/symbol-observable/lib/ponyfill.js
@@ -0,0 +1,23 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+	value: true
+});
+exports['default'] = symbolObservablePonyfill;
+function symbolObservablePonyfill(root) {
+	var result;
+	var _Symbol = root.Symbol;
+
+	if (typeof _Symbol === 'function') {
+		if (_Symbol.observable) {
+			result = _Symbol.observable;
+		} else {
+			result = _Symbol('observable');
+			_Symbol.observable = result;
+		}
+	} else {
+		result = '@@observable';
+	}
+
+	return result;
+};
+\ No newline at end of file