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RequireContextPlugin.js
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Sat, Mar 15, 19:41

RequireContextPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { cachedSetProperty } = require("../util/cleverMerge");
const ContextElementDependency = require("./ContextElementDependency");
const RequireContextDependency = require("./RequireContextDependency");
const RequireContextDependencyParserPlugin = require("./RequireContextDependencyParserPlugin");
/** @typedef {import("../../declarations/WebpackOptions").ResolveOptions} ResolveOptions */
/** @typedef {import("../Compiler")} Compiler */
/** @type {ResolveOptions} */
const EMPTY_RESOLVE_OPTIONS = {};
class RequireContextPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(
"RequireContextPlugin",
(compilation, { contextModuleFactory, normalModuleFactory }) => {
compilation.dependencyFactories.set(
RequireContextDependency,
contextModuleFactory
);
compilation.dependencyTemplates.set(
RequireContextDependency,
new RequireContextDependency.Template()
);
compilation.dependencyFactories.set(
ContextElementDependency,
normalModuleFactory
);
const handler = (parser, parserOptions) => {
if (
parserOptions.requireContext !== undefined &&
!parserOptions.requireContext
)
return;
new RequireContextDependencyParserPlugin().apply(parser);
};
normalModuleFactory.hooks.parser
.for("javascript/auto")
.tap("RequireContextPlugin", handler);
normalModuleFactory.hooks.parser
.for("javascript/dynamic")
.tap("RequireContextPlugin", handler);
contextModuleFactory.hooks.alternativeRequests.tap(
"RequireContextPlugin",
(items, options) => {
if (items.length === 0) return items;
const finalResolveOptions = compiler.resolverFactory.get(
"normal",
cachedSetProperty(
options.resolveOptions || EMPTY_RESOLVE_OPTIONS,
"dependencyType",
options.category
)
).options;
let newItems;
if (!finalResolveOptions.fullySpecified) {
newItems = [];
for (const item of items) {
const { request, context } = item;
for (const ext of finalResolveOptions.extensions) {
if (request.endsWith(ext)) {
newItems.push({
context,
request: request.slice(0, -ext.length)
});
}
}
if (!finalResolveOptions.enforceExtension) {
newItems.push(item);
}
}
items = newItems;
newItems = [];
for (const obj of items) {
const { request, context } = obj;
for (const mainFile of finalResolveOptions.mainFiles) {
if (request.endsWith(`/${mainFile}`)) {
newItems.push({
context,
request: request.slice(0, -mainFile.length)
});
newItems.push({
context,
request: request.slice(0, -mainFile.length - 1)
});
}
}
newItems.push(obj);
}
items = newItems;
}
newItems = [];
for (const item of items) {
let hideOriginal = false;
for (const modulesItems of finalResolveOptions.modules) {
if (Array.isArray(modulesItems)) {
for (const dir of modulesItems) {
if (item.request.startsWith(`./${dir}/`)) {
newItems.push({
context: item.context,
request: item.request.slice(dir.length + 3)
});
hideOriginal = true;
}
}
} else {
const dir = modulesItems.replace(/\\/g, "/");
const fullPath =
item.context.replace(/\\/g, "/") + item.request.slice(1);
if (fullPath.startsWith(dir)) {
newItems.push({
context: item.context,
request: fullPath.slice(dir.length + 1)
});
}
}
}
if (!hideOriginal) {
newItems.push(item);
}
}
return newItems;
}
);
}
);
}
}
module.exports = RequireContextPlugin;

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