Index: frontend/node_modules/is-stream/index.js
===================================================================
--- frontend/node_modules/is-stream/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/is-stream/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,28 @@
+'use strict';
+
+const isStream = stream =>
+	stream !== null &&
+	typeof stream === 'object' &&
+	typeof stream.pipe === 'function';
+
+isStream.writable = stream =>
+	isStream(stream) &&
+	stream.writable !== false &&
+	typeof stream._write === 'function' &&
+	typeof stream._writableState === 'object';
+
+isStream.readable = stream =>
+	isStream(stream) &&
+	stream.readable !== false &&
+	typeof stream._read === 'function' &&
+	typeof stream._readableState === 'object';
+
+isStream.duplex = stream =>
+	isStream.writable(stream) &&
+	isStream.readable(stream);
+
+isStream.transform = stream =>
+	isStream.duplex(stream) &&
+	typeof stream._transform === 'function';
+
+module.exports = isStream;