/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra and Zackary Jackson @ScriptedAlchemy
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*/
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"use strict";
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const { RawSource } = require("webpack-sources");
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const Module = require("../Module");
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const {
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JAVASCRIPT_TYPE,
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JAVASCRIPT_TYPES
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} = require("../ModuleSourceTypeConstants");
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const { WEBPACK_MODULE_TYPE_FALLBACK } = require("../ModuleTypeConstants");
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const RuntimeGlobals = require("../RuntimeGlobals");
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const Template = require("../Template");
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const makeSerializable = require("../util/makeSerializable");
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const FallbackItemDependency = require("./FallbackItemDependency");
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/** @typedef {import("../config/defaults").WebpackOptionsNormalizedWithDefaults} WebpackOptions */
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compilation")} Compilation */
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/** @typedef {import("../Module").BuildCallback} BuildCallback */
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/** @typedef {import("../Module").CodeGenerationContext} CodeGenerationContext */
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/** @typedef {import("../Module").CodeGenerationResult} CodeGenerationResult */
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/** @typedef {import("../Module").LibIdentOptions} LibIdentOptions */
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/** @typedef {import("../Module").LibIdent} LibIdent */
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/** @typedef {import("../Module").NameForCondition} NameForCondition */
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/** @typedef {import("../Module").NeedBuildCallback} NeedBuildCallback */
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/** @typedef {import("../Module").NeedBuildContext} NeedBuildContext */
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/** @typedef {import("../Module").Sources} Sources */
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/** @typedef {import("../Module").SourceTypes} SourceTypes */
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/** @typedef {import("../RequestShortener")} RequestShortener */
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/** @typedef {import("../ResolverFactory").ResolverWithOptions} ResolverWithOptions */
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/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
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/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
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/** @typedef {import("../util/fs").InputFileSystem} InputFileSystem */
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/** @typedef {import("./RemoteModule").ExternalRequests} ExternalRequests */
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const RUNTIME_REQUIREMENTS = new Set([RuntimeGlobals.module]);
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class FallbackModule extends Module {
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/**
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* Creates an instance of FallbackModule.
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* @param {ExternalRequests} requests list of requests to choose one
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*/
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constructor(requests) {
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super(WEBPACK_MODULE_TYPE_FALLBACK);
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/** @type {ExternalRequests} */
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this.requests = requests;
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/** @type {string} */
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this._identifier = `fallback ${this.requests.join(" ")}`;
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}
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/**
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* Returns the unique identifier used to reference this module.
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* @returns {string} a unique identifier of the module
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*/
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identifier() {
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return this._identifier;
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}
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/**
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* Returns a human-readable identifier for this module.
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* @param {RequestShortener} requestShortener the request shortener
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* @returns {string} a user readable identifier of the module
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*/
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readableIdentifier(requestShortener) {
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return this._identifier;
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}
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/**
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* Gets the library identifier.
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* @param {LibIdentOptions} options options
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* @returns {LibIdent | null} an identifier for library inclusion
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*/
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libIdent(options) {
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return `${this.layer ? `(${this.layer})/` : ""}webpack/container/fallback/${
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this.requests[0]
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}/and ${this.requests.length - 1} more`;
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}
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/**
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* Returns true if the module can be placed in the chunk.
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* @param {Chunk} chunk the chunk which condition should be checked
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* @param {Compilation} compilation the compilation
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* @returns {boolean} true if the module can be placed in the chunk
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*/
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chunkCondition(chunk, { chunkGraph }) {
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return chunkGraph.getNumberOfEntryModules(chunk) > 0;
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}
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/**
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* Checks whether the module needs to be rebuilt for the current build state.
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* @param {NeedBuildContext} context context info
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* @param {NeedBuildCallback} callback callback function, returns true, if the module needs a rebuild
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* @returns {void}
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*/
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needBuild(context, callback) {
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callback(null, !this.buildInfo);
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}
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/**
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* Builds the module using the provided compilation context.
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* @param {WebpackOptions} options webpack options
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* @param {Compilation} compilation the compilation
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* @param {ResolverWithOptions} resolver the resolver
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* @param {InputFileSystem} fs the file system
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* @param {BuildCallback} callback callback function
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* @returns {void}
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*/
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build(options, compilation, resolver, fs, callback) {
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this.buildMeta = {};
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this.buildInfo = {
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strict: true
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};
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this.clearDependenciesAndBlocks();
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for (const request of this.requests) {
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this.addDependency(new FallbackItemDependency(request));
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}
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callback();
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}
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/**
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* Returns the estimated size for the requested source type.
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* @param {string=} type the source type for which the size should be estimated
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* @returns {number} the estimated size of the module (must be non-zero)
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*/
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size(type) {
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return this.requests.length * 5 + 42;
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}
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/**
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* Returns the source types this module can generate.
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* @returns {SourceTypes} types available (do not mutate)
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*/
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getSourceTypes() {
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return JAVASCRIPT_TYPES;
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}
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/**
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* Generates code and runtime requirements for this module.
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* @param {CodeGenerationContext} context context for code generation
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* @returns {CodeGenerationResult} result
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*/
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codeGeneration({ runtimeTemplate, moduleGraph, chunkGraph }) {
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const ids = this.dependencies.map((dep) =>
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chunkGraph.getModuleId(/** @type {Module} */ (moduleGraph.getModule(dep)))
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);
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const code = Template.asString([
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`var ids = ${JSON.stringify(ids)};`,
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"var error, result, i = 0;",
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`var loop = ${runtimeTemplate.basicFunction("next", [
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"while(i < ids.length) {",
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Template.indent([
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`try { next = ${RuntimeGlobals.require}(ids[i++]); } catch(e) { return handleError(e); }`,
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"if(next) return next.then ? next.then(handleResult, handleError) : handleResult(next);"
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]),
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"}",
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"if(error) throw error;"
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])}`,
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`var handleResult = ${runtimeTemplate.basicFunction("result", [
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"if(result) return result;",
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"return loop();"
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])};`,
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`var handleError = ${runtimeTemplate.basicFunction("e", [
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"error = e;",
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"return loop();"
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])};`,
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"module.exports = loop();"
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]);
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/** @type {Sources} */
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const sources = new Map();
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sources.set(JAVASCRIPT_TYPE, new RawSource(code));
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return { sources, runtimeRequirements: RUNTIME_REQUIREMENTS };
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}
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/**
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* Serializes this instance into the provided serializer context.
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* @param {ObjectSerializerContext} context context
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*/
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serialize(context) {
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const { write } = context;
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write(this.requests);
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super.serialize(context);
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}
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/**
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* Restores this instance from the provided deserializer context.
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* @param {ObjectDeserializerContext} context context
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* @returns {FallbackModule} deserialized fallback module
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*/
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static deserialize(context) {
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const { read } = context;
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const obj = new FallbackModule(read());
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obj.deserialize(context);
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return obj;
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}
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}
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makeSerializable(FallbackModule, "webpack/lib/container/FallbackModule");
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module.exports = FallbackModule;
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