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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;