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