2 files changed, 36 insertions, 0 deletions
diff --git a/node_modules/symbol-observable/es/index.js b/node_modules/symbol-observable/es/index.js
new file mode 100644
index 000000000..4ed892d25
--- /dev/null
+++ b/node_modules/symbol-observable/es/index.js
@@ -0,0 +1,19 @@
+/* global window */
+import ponyfill from './ponyfill.js';
+
+var root;
+
+if (typeof self !== 'undefined') {
+  root = self;
+} else if (typeof window !== 'undefined') {
+  root = window;
+} else if (typeof global !== 'undefined') {
+  root = global;
+} else if (typeof module !== 'undefined') {
+  root = module;
+} else {
+  root = Function('return this')();
+}
+
+var result = ponyfill(root);
+export default result;
diff --git a/node_modules/symbol-observable/es/ponyfill.js b/node_modules/symbol-observable/es/ponyfill.js
new file mode 100644
index 000000000..95dedc2e5
--- /dev/null
+++ b/node_modules/symbol-observable/es/ponyfill.js
@@ -0,0 +1,17 @@
+export default 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;
+};