Updated the files.

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

@@ -0,0 +1,33 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const CHAR_CODE_NEW_LINE = "\n".charCodeAt(0);
+
+const getGeneratedSourceInfo = source => {
+	if (source === undefined) {
+		return {};
+	}
+	const lastLineStart = source.lastIndexOf("\n");
+	if (lastLineStart === -1) {
+		return {
+			generatedLine: 1,
+			generatedColumn: source.length,
+			source
+		};
+	}
+	let generatedLine = 2;
+	for (let i = 0; i < lastLineStart; i++) {
+		if (source.charCodeAt(i) === CHAR_CODE_NEW_LINE) generatedLine++;
+	}
+	return {
+		generatedLine,
+		generatedColumn: source.length - lastLineStart - 1,
+		source
+	};
+};
+
+module.exports = getGeneratedSourceInfo;