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app_vue/node_modules/webpack/lib/AutomaticPrefetchPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const asyncLib = require("neo-async");
+const NormalModule = require("./NormalModule");
+const PrefetchDependency = require("./dependencies/PrefetchDependency");
+
+/** @typedef {import("./Compiler")} Compiler */
+
+const PLUGIN_NAME = "AutomaticPrefetchPlugin";
+
+class AutomaticPrefetchPlugin {
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
+	apply(compiler) {
+		compiler.hooks.compilation.tap(
+			PLUGIN_NAME,
+			(compilation, { normalModuleFactory }) => {
+				compilation.dependencyFactories.set(
+					PrefetchDependency,
+					normalModuleFactory
+				);
+			}
+		);
+		/** @type {{context: string | null, request: string}[] | null} */
+		let lastModules = null;
+		compiler.hooks.afterCompile.tap(PLUGIN_NAME, compilation => {
+			lastModules = [];
+
+			for (const m of compilation.modules) {
+				if (m instanceof NormalModule) {
+					lastModules.push({
+						context: m.context,
+						request: m.request
+					});
+				}
+			}
+		});
+		compiler.hooks.make.tapAsync(PLUGIN_NAME, (compilation, callback) => {
+			if (!lastModules) return callback();
+			asyncLib.each(
+				lastModules,
+				(m, callback) => {
+					compilation.addModuleChain(
+						m.context || compiler.context,
+						new PrefetchDependency(`!!${m.request}`),
+						callback
+					);
+				},
+				err => {
+					lastModules = null;
+					callback(err);
+				}
+			);
+		});
+	}
+}
+module.exports = AutomaticPrefetchPlugin;