Updated the files.

my-app/node_modules/webpack-sources/lib/helpers/streamChunks.js

@@ -0,0 +1,36 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const streamChunksOfRawSource = require("./streamChunksOfRawSource");
+const streamChunksOfSourceMap = require("./streamChunksOfSourceMap");
+
+module.exports = (source, options, onChunk, onSource, onName) => {
+	if (typeof source.streamChunks === "function") {
+		return source.streamChunks(options, onChunk, onSource, onName);
+	} else {
+		const sourceAndMap = source.sourceAndMap(options);
+		if (sourceAndMap.map) {
+			return streamChunksOfSourceMap(
+				sourceAndMap.source,
+				sourceAndMap.map,
+				onChunk,
+				onSource,
+				onName,
+				!!(options && options.finalSource),
+				!!(options && options.columns !== false)
+			);
+		} else {
+			return streamChunksOfRawSource(
+				sourceAndMap.source,
+				onChunk,
+				onSource,
+				onName,
+				!!(options && options.finalSource)
+			);
+		}
+	}
+};