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LoaderPlugin.js
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Thu, Feb 13, 19:48

LoaderPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const NormalModule = require("../NormalModule");
const LazySet = require("../util/LazySet");
const LoaderDependency = require("./LoaderDependency");
/** @typedef {import("../Module")} Module */
/**
* @callback LoadModuleCallback
* @param {Error=} err error object
* @param {string=} source source code
* @param {object=} map source map
* @param {Module=} module loaded module if successful
*/
class LoaderPlugin {
apply(compiler) {
compiler.hooks.compilation.tap(
"LoaderPlugin",
(compilation, { normalModuleFactory }) => {
compilation.dependencyFactories.set(
LoaderDependency,
normalModuleFactory
);
}
);
compiler.hooks.compilation.tap("LoaderPlugin", compilation => {
const moduleGraph = compilation.moduleGraph;
NormalModule.getCompilationHooks(compilation).loader.tap(
"LoaderPlugin",
loaderContext => {
/**
* @param {string} request the request string to load the module from
* @param {LoadModuleCallback} callback callback returning the loaded module or error
* @returns {void}
*/
loaderContext.loadModule = (request, callback) => {
const dep = new LoaderDependency(request);
dep.loc = {
name: request
};
const factory = compilation.dependencyFactories.get(
dep.constructor
);
if (factory === undefined) {
return callback(
new Error(
`No module factory available for dependency type: ${dep.constructor.name}`
)
);
}
compilation.buildQueue.increaseParallelism();
compilation.handleModuleCreation(
{
factory,
dependencies: [dep],
originModule: loaderContext._module,
context: loaderContext.context,
recursive: false
},
err => {
compilation.buildQueue.decreaseParallelism();
if (err) {
return callback(err);
}
const referencedModule = moduleGraph.getModule(dep);
if (!referencedModule) {
return callback(new Error("Cannot load the module"));
}
const moduleSource = referencedModule.originalSource();
if (!moduleSource) {
throw new Error(
"The module created for a LoaderDependency must have an original source"
);
}
let source, map;
if (moduleSource.sourceAndMap) {
const sourceAndMap = moduleSource.sourceAndMap();
map = sourceAndMap.map;
source = sourceAndMap.source;
} else {
map = moduleSource.map();
source = moduleSource.source();
}
const fileDependencies = new LazySet();
const contextDependencies = new LazySet();
const missingDependencies = new LazySet();
const buildDependencies = new LazySet();
referencedModule.addCacheDependencies(
fileDependencies,
contextDependencies,
missingDependencies,
buildDependencies
);
for (const d of fileDependencies) {
loaderContext.addDependency(d);
}
for (const d of contextDependencies) {
loaderContext.addContextDependency(d);
}
for (const d of missingDependencies) {
loaderContext.addMissingDependency(d);
}
for (const d of buildDependencies) {
loaderContext.addBuildDependency(d);
}
return callback(null, source, map, referencedModule);
}
);
};
}
);
});
}
}
module.exports = LoaderPlugin;

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