Updated the files.

my-app/node_modules/webpack/lib/SourceMapDevToolModuleOptionsPlugin.js

@@ -0,0 +1,61 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const JavascriptModulesPlugin = require("./javascript/JavascriptModulesPlugin");
+
+/** @typedef {import("../declarations/plugins/SourceMapDevToolPlugin").SourceMapDevToolPluginOptions} SourceMapDevToolPluginOptions */
+/** @typedef {import("./Compilation")} Compilation */
+
+class SourceMapDevToolModuleOptionsPlugin {
+	/**
+	 * @param {SourceMapDevToolPluginOptions} options options
+	 */
+	constructor(options) {
+		this.options = options;
+	}
+
+	/**
+	 * @param {Compilation} compilation the compiler instance
+	 * @returns {void}
+	 */
+	apply(compilation) {
+		const options = this.options;
+		if (options.module !== false) {
+			compilation.hooks.buildModule.tap(
+				"SourceMapDevToolModuleOptionsPlugin",
+				module => {
+					module.useSourceMap = true;
+				}
+			);
+			compilation.hooks.runtimeModule.tap(
+				"SourceMapDevToolModuleOptionsPlugin",
+				module => {
+					module.useSourceMap = true;
+				}
+			);
+		} else {
+			compilation.hooks.buildModule.tap(
+				"SourceMapDevToolModuleOptionsPlugin",
+				module => {
+					module.useSimpleSourceMap = true;
+				}
+			);
+			compilation.hooks.runtimeModule.tap(
+				"SourceMapDevToolModuleOptionsPlugin",
+				module => {
+					module.useSimpleSourceMap = true;
+				}
+			);
+		}
+		JavascriptModulesPlugin.getCompilationHooks(compilation).useSourceMap.tap(
+			"SourceMapDevToolModuleOptionsPlugin",
+			() => true
+		);
+	}
+}
+
+module.exports = SourceMapDevToolModuleOptionsPlugin;