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FallbackModule.js
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Thu, Feb 13, 20:47

FallbackModule.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra and Zackary Jackson @ScriptedAlchemy
*/
"use strict";
const { RawSource } = require("webpack-sources");
const Module = require("../Module");
const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const makeSerializable = require("../util/makeSerializable");
const FallbackItemDependency = require("./FallbackItemDependency");
/** @typedef {import("../../declarations/WebpackOptions").WebpackOptionsNormalized} WebpackOptions */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../ChunkGroup")} ChunkGroup */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Module").CodeGenerationContext} CodeGenerationContext */
/** @typedef {import("../Module").CodeGenerationResult} CodeGenerationResult */
/** @typedef {import("../Module").LibIdentOptions} LibIdentOptions */
/** @typedef {import("../Module").NeedBuildContext} NeedBuildContext */
/** @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 TYPES = new Set(["javascript"]);
const RUNTIME_REQUIREMENTS = new Set([RuntimeGlobals.module]);
class FallbackModule extends Module {
/**
* @param {string[]} requests list of requests to choose one
*/
constructor(requests) {
super("fallback-module");
this.requests = requests;
this._identifier = `fallback ${this.requests.join(" ")}`;
}
/**
* @returns {string} a unique identifier of the module
*/
identifier() {
return this._identifier;
}
/**
* @param {RequestShortener} requestShortener the request shortener
* @returns {string} a user readable identifier of the module
*/
readableIdentifier(requestShortener) {
return this._identifier;
}
/**
* @param {LibIdentOptions} options options
* @returns {string | null} an identifier for library inclusion
*/
libIdent(options) {
return `webpack/container/fallback/${this.requests[0]}/and ${
this.requests.length - 1
} more`;
}
/**
* @param {Chunk} chunk the chunk which condition should be checked
* @param {Compilation} compilation the compilation
* @returns {boolean} true, if the chunk is ok for the module
*/
chunkCondition(chunk, { chunkGraph }) {
return chunkGraph.getNumberOfEntryModules(chunk) > 0;
}
/**
* @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);
}
/**
* @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.buildMeta = {};
this.buildInfo = {
strict: true
};
this.clearDependenciesAndBlocks();
for (const request of this.requests)
this.addDependency(new FallbackItemDependency(request));
callback();
}
/**
* @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 this.requests.length * 5 + 42;
}
/**
* @returns {Set<string>} types available (do not mutate)
*/
getSourceTypes() {
return TYPES;
}
/**
* @param {CodeGenerationContext} context context for code generation
* @returns {CodeGenerationResult} result
*/
codeGeneration({ runtimeTemplate, moduleGraph, chunkGraph }) {
const ids = this.dependencies.map(dep =>
chunkGraph.getModuleId(moduleGraph.getModule(dep))
);
const code = Template.asString([
`var ids = ${JSON.stringify(ids)};`,
"var error, result, i = 0;",
`var loop = ${runtimeTemplate.basicFunction("next", [
"while(i < ids.length) {",
Template.indent([
"try { next = __webpack_require__(ids[i++]); } catch(e) { return handleError(e); }",
"if(next) return next.then ? next.then(handleResult, handleError) : handleResult(next);"
]),
"}",
"if(error) throw error;"
])}`,
`var handleResult = ${runtimeTemplate.basicFunction("result", [
"if(result) return result;",
"return loop();"
])};`,
`var handleError = ${runtimeTemplate.basicFunction("e", [
"error = e;",
"return loop();"
])};`,
"module.exports = loop();"
]);
const sources = new Map();
sources.set("javascript", new RawSource(code));
return { sources, runtimeRequirements: RUNTIME_REQUIREMENTS };
}
serialize(context) {
const { write } = context;
write(this.requests);
super.serialize(context);
}
static deserialize(context) {
const { read } = context;
const obj = new FallbackModule(read());
obj.deserialize(context);
return obj;
}
}
makeSerializable(FallbackModule, "webpack/lib/container/FallbackModule");
module.exports = FallbackModule;

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