1 files changed, 30 insertions, 21 deletions
diff --git a/node_modules/webpack-sources/lib/Source.js b/node_modules/webpack-sources/lib/Source.js
index 1c729fcf1..c8300f44e 100644
--- a/node_modules/webpack-sources/lib/Source.js
+++ b/node_modules/webpack-sources/lib/Source.js
@@ -2,35 +2,44 @@
 	MIT License http://www.opensource.org/licenses/mit-license.php
 	Author Tobias Koppers @sokra
 */
+"use strict";
+
 var SourceNode = require("source-map").SourceNode;
 var SourceMapConsumer = require("source-map").SourceMapConsumer;
 
-function Source() {}
+class Source {
 
-module.exports = Source;
+	source() {
+		throw new Error("Abstract");
+	}
 
-Source.prototype.source = null;
+	size() {
+		return this.source().length;
+	}
 
-Source.prototype.size = function() {
-	return this.source().length;
-};
+	map(options) {
+		return null;
+	}
 
-Source.prototype.map = function(options) {
-	return null;
-};
+	sourceAndMap(options) {
+		return {
+			source: this.source(),
+			map: this.map()
+		};
+	}
 
-Source.prototype.sourceAndMap = function(options) {
-	return {
-		source: this.source(),
-		map: this.map()
-	};
-};
+	node() {
+		throw new Error("Abstract");
+	}
 
-Source.prototype.node = null;
+	listNode() {
+		throw new Error("Abstract");
+	}
 
-Source.prototype.listNode = null;
+	updateHash(hash) {
+		var source = this.source();
+		hash.update(source || "");
+	}
+}
 
-Source.prototype.updateHash = function(hash) {
-	var source = this.source();
-	hash.update(source || "");
-};
+module.exports = Source;