67 lines
1.5 KiB
JavaScript
67 lines
1.5 KiB
JavaScript
/*
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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 NormalModule = require("./NormalModule");
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const PrefetchDependency = require("./dependencies/PrefetchDependency");
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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 the compiler instance
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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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/** @type {{context: string | null, request: string}[] | null} */
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let lastModules = null;
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compiler.hooks.afterCompile.tap("AutomaticPrefetchPlugin", compilation => {
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lastModules = [];
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for (const m of compilation.modules) {
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if (m instanceof NormalModule) {
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lastModules.push({
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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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}
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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.each(
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lastModules,
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(m, callback) => {
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compilation.addModuleChain(
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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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err => {
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lastModules = null;
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callback(err);
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}
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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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