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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { RawSource } = require("webpack-sources");
const AsyncDependenciesBlock = require("../AsyncDependenciesBlock");
const Dependency = require("../Dependency");
const Module = require("../Module");
const ModuleFactory = require("../ModuleFactory");
const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const CommonJsRequireDependency = require("../dependencies/CommonJsRequireDependency");
const { registerNotSerializable } = require("../util/serialization");
/** @typedef {import("../../declarations/WebpackOptions")} WebpackOptions */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../Module").BuildMeta} BuildMeta */
/** @typedef {import("../Module").CodeGenerationContext} CodeGenerationContext */
/** @typedef {import("../Module").CodeGenerationResult} CodeGenerationResult */
/** @typedef {import("../Module").LibIdentOptions} LibIdentOptions */
/** @typedef {import("../Module").NeedBuildContext} NeedBuildContext */
/** @typedef {import("../ModuleFactory").ModuleFactoryCreateData} ModuleFactoryCreateData */
/** @typedef {import("../ModuleFactory").ModuleFactoryResult} ModuleFactoryResult */
/** @typedef {import("../RequestShortener")} RequestShortener */
/** @typedef {import("../ResolverFactory").ResolverWithOptions} ResolverWithOptions */
/** @typedef {import("../WebpackError")} WebpackError */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../util/fs").InputFileSystem} InputFileSystem */
const IGNORED_DEPENDENCY_TYPES = new Set([
"import.meta.webpackHot.accept",
"import.meta.webpackHot.decline",
"module.hot.accept",
"module.hot.decline"
]);
/**
* @param {undefined|string|RegExp|Function} test test option
* @param {Module} module the module
* @returns {boolean} true, if the module should be selected
*/
const checkTest = (test, module) => {
if (test === undefined) return true;
if (typeof test === "function") {
return test(module);
}
if (typeof test === "string") {
const name = module.nameForCondition();
return name && name.startsWith(test);
}
if (test instanceof RegExp) {
const name = module.nameForCondition();
return name && test.test(name);
}
return false;
};
const TYPES = new Set(["javascript"]);
class LazyCompilationDependency extends Dependency {
constructor(proxyModule) {
super();
this.proxyModule = proxyModule;
}
get category() {
return "esm";
}
get type() {
return "lazy import()";
}
/**
* @returns {string | null} an identifier to merge equal requests
*/
getResourceIdentifier() {
return this.proxyModule.originalModule.identifier();
}
}
registerNotSerializable(LazyCompilationDependency);
class LazyCompilationProxyModule extends Module {
constructor(context, originalModule, request, client, data, active) {
super("lazy-compilation-proxy", context, originalModule.layer);
this.originalModule = originalModule;
this.request = request;
this.client = client;
this.data = data;
this.active = active;
}
/**
* @returns {string} a unique identifier of the module
*/
identifier() {
return `lazy-compilation-proxy|${this.originalModule.identifier()}`;
}
/**
* @param {RequestShortener} requestShortener the request shortener
* @returns {string} a user readable identifier of the module
*/
readableIdentifier(requestShortener) {
return `lazy-compilation-proxy ${this.originalModule.readableIdentifier(
requestShortener
)}`;
}
/**
* Assuming this module is in the cache. Update the (cached) module with
* the fresh module from the factory. Usually updates internal references
* and properties.
* @param {Module} module fresh module
* @returns {void}
*/
updateCacheModule(module) {
super.updateCacheModule(module);
const m = /** @type {LazyCompilationProxyModule} */ (module);
this.originalModule = m.originalModule;
this.request = m.request;
this.client = m.client;
this.data = m.data;
this.active = m.active;
}
/**
* @param {LibIdentOptions} options options
* @returns {string | null} an identifier for library inclusion
*/
libIdent(options) {
return `${this.originalModule.libIdent(options)}!lazy-compilation-proxy`;
}
/**
* @param {NeedBuildContext} context context info
* @param {function(WebpackError=, boolean=): void} callback callback function, returns true, if the module needs a rebuild
* @returns {void}
*/
needBuild(context, callback) {
callback(null, !this.buildInfo || this.buildInfo.active !== this.active);
}
/**
* @param {WebpackOptions} options webpack options
* @param {Compilation} compilation the compilation
* @param {ResolverWithOptions} resolver the resolver
* @param {InputFileSystem} fs the file system
* @param {function(WebpackError=): void} callback callback function
* @returns {void}
*/
build(options, compilation, resolver, fs, callback) {
this.buildInfo = {
active: this.active
};
/** @type {BuildMeta} */
this.buildMeta = {};
this.clearDependenciesAndBlocks();
const dep = new CommonJsRequireDependency(this.client);
this.addDependency(dep);
if (this.active) {
const dep = new LazyCompilationDependency(this);
const block = new AsyncDependenciesBlock({});
block.addDependency(dep);
this.addBlock(block);
}
callback();
}
/**
* @returns {Set<string>} types available (do not mutate)
*/
getSourceTypes() {
return TYPES;
}
/**
* @param {string=} type the source type for which the size should be estimated
* @returns {number} the estimated size of the module (must be non-zero)
*/
size(type) {
return 200;
}
/**
* @param {CodeGenerationContext} context context for code generation
* @returns {CodeGenerationResult} result
*/
codeGeneration({ runtimeTemplate, chunkGraph, moduleGraph }) {
const sources = new Map();
const runtimeRequirements = new Set();
runtimeRequirements.add(RuntimeGlobals.module);
const clientDep = /** @type {CommonJsRequireDependency} */ (
this.dependencies[0]
);
const clientModule = moduleGraph.getModule(clientDep);
const block = this.blocks[0];
const client = Template.asString([
`var client = ${runtimeTemplate.moduleExports({
module: clientModule,
chunkGraph,
request: clientDep.userRequest,
runtimeRequirements
})}`,
`var data = ${JSON.stringify(this.data)};`
]);
const keepActive = Template.asString([
`var dispose = client.keepAlive({ data: data, active: ${JSON.stringify(
!!block
)}, module: module, onError: onError });`
]);
let source;
if (block) {
const dep = block.dependencies[0];
const module = moduleGraph.getModule(dep);
source = Template.asString([
client,
`module.exports = ${runtimeTemplate.moduleNamespacePromise({
chunkGraph,
block,
module,
request: this.request,
strict: false, // TODO this should be inherited from the original module
message: "import()",
runtimeRequirements
})};`,
"if (module.hot) {",
Template.indent([
"module.hot.accept();",
`module.hot.accept(${JSON.stringify(
chunkGraph.getModuleId(module)
)}, function() { module.hot.invalidate(); });`,
"module.hot.dispose(function(data) { delete data.resolveSelf; dispose(data); });",
"if (module.hot.data && module.hot.data.resolveSelf) module.hot.data.resolveSelf(module.exports);"
]),
"}",
"function onError() { /* ignore */ }",
keepActive
]);
} else {
source = Template.asString([
client,
"var resolveSelf, onError;",
`module.exports = new Promise(function(resolve, reject) { resolveSelf = resolve; onError = reject; });`,
"if (module.hot) {",
Template.indent([
"module.hot.accept();",
"if (module.hot.data && module.hot.data.resolveSelf) module.hot.data.resolveSelf(module.exports);",
"module.hot.dispose(function(data) { data.resolveSelf = resolveSelf; dispose(data); });"
]),
"}",
keepActive
]);
}
sources.set("javascript", new RawSource(source));
return {
sources,
runtimeRequirements
};
}
/**
* @param {Hash} hash the hash used to track dependencies
* @param {UpdateHashContext} context context
* @returns {void}
*/
updateHash(hash, context) {
super.updateHash(hash, context);
hash.update(this.active ? "active" : "");
hash.update(JSON.stringify(this.data));
}
}
registerNotSerializable(LazyCompilationProxyModule);
class LazyCompilationDependencyFactory extends ModuleFactory {
constructor(factory) {
super();
this._factory = factory;
}
/**
* @param {ModuleFactoryCreateData} data data object
* @param {function(Error=, ModuleFactoryResult=): void} callback callback
* @returns {void}
*/
create(data, callback) {
const dependency = /** @type {LazyCompilationDependency} */ (
data.dependencies[0]
);
callback(null, {
module: dependency.proxyModule.originalModule
});
}
}
class LazyCompilationPlugin {
/**
* @param {Object} options options
* @param {(function(Compiler, string, function(Error?, any?): void): void) | function(Compiler, string): Promise<any>} options.backend the backend
* @param {string} options.client the client reference
* @param {boolean} options.entries true, when entries are lazy compiled
* @param {boolean} options.imports true, when import() modules are lazy compiled
* @param {RegExp | string | (function(Module): boolean)} options.test additional filter for lazy compiled entrypoint modules
*/
constructor({ backend, client, entries, imports, test }) {
this.backend = backend;
this.client = client;
this.entries = entries;
this.imports = imports;
this.test = test;
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
let backend;
compiler.hooks.beforeCompile.tapAsync(
"LazyCompilationPlugin",
(params, callback) => {
if (backend !== undefined) return callback();
const promise = this.backend(compiler, this.client, (err, result) => {
if (err) return callback(err);
backend = result;
callback();
});
if (promise && promise.then) {
promise.then(b => {
backend = b;
callback();
}, callback);
}
}
);
compiler.hooks.thisCompilation.tap(
"LazyCompilationPlugin",
(compilation, { normalModuleFactory }) => {
normalModuleFactory.hooks.module.tap(
"LazyCompilationPlugin",
(originalModule, createData, resolveData) => {
if (
resolveData.dependencies.every(
dep =>
IGNORED_DEPENDENCY_TYPES.has(dep.type) ||
(this.imports &&
(dep.type === "import()" ||
dep.type === "import() context element")) ||
(this.entries && dep.type === "entry")
) &&
!/webpack[/\\]hot[/\\]|webpack-dev-server[/\\]client/.test(
resolveData.request
) &&
checkTest(this.test, originalModule)
) {
const moduleInfo = backend.module(originalModule);
if (!moduleInfo) return;
const { client, data, active } = moduleInfo;
return new LazyCompilationProxyModule(
compiler.context,
originalModule,
resolveData.request,
client,
data,
active
);
}
}
);
compilation.dependencyFactories.set(
LazyCompilationDependency,
new LazyCompilationDependencyFactory()
);
}
);
compiler.hooks.shutdown.tapAsync("LazyCompilationPlugin", callback => {
backend.dispose(callback);
});
}
}
module.exports = LazyCompilationPlugin;