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Compilation.js
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Compilation.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const asyncLib = require("neo-async");
const util = require("util");
const { CachedSource } = require("webpack-sources");
const {
Tapable,
SyncHook,
SyncBailHook,
SyncWaterfallHook,
AsyncSeriesHook
} = require("tapable");
const EntryModuleNotFoundError = require("./EntryModuleNotFoundError");
const ModuleNotFoundError = require("./ModuleNotFoundError");
const ModuleDependencyWarning = require("./ModuleDependencyWarning");
const ModuleDependencyError = require("./ModuleDependencyError");
const ChunkGroup = require("./ChunkGroup");
const Chunk = require("./Chunk");
const Entrypoint = require("./Entrypoint");
const MainTemplate = require("./MainTemplate");
const ChunkTemplate = require("./ChunkTemplate");
const HotUpdateChunkTemplate = require("./HotUpdateChunkTemplate");
const ModuleTemplate = require("./ModuleTemplate");
const RuntimeTemplate = require("./RuntimeTemplate");
const ChunkRenderError = require("./ChunkRenderError");
const Stats = require("./Stats");
const Semaphore = require("./util/Semaphore");
const createHash = require("./util/createHash");
const SortableSet = require("./util/SortableSet");
const GraphHelpers = require("./GraphHelpers");
const ModuleDependency = require("./dependencies/ModuleDependency");
const compareLocations = require("./compareLocations");
const { Logger, LogType } = require("./logging/Logger");
const ErrorHelpers = require("./ErrorHelpers");
const buildChunkGraph = require("./buildChunkGraph");
const WebpackError = require("./WebpackError");
/** @typedef {import("./Module")} Module */
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("./DependenciesBlockVariable")} DependenciesBlockVariable */
/** @typedef {import("./dependencies/SingleEntryDependency")} SingleEntryDependency */
/** @typedef {import("./dependencies/MultiEntryDependency")} MultiEntryDependency */
/** @typedef {import("./dependencies/DllEntryDependency")} DllEntryDependency */
/** @typedef {import("./dependencies/DependencyReference")} DependencyReference */
/** @typedef {import("./DependenciesBlock")} DependenciesBlock */
/** @typedef {import("./AsyncDependenciesBlock")} AsyncDependenciesBlock */
/** @typedef {import("./Dependency")} Dependency */
/** @typedef {import("./Dependency").DependencyLocation} DependencyLocation */
/** @typedef {import("./Dependency").DependencyTemplate} DependencyTemplate */
/** @typedef {import("./util/createHash").Hash} Hash */
// TODO use @callback
/** @typedef {{[assetName: string]: Source}} CompilationAssets */
/** @typedef {(err: Error|null, result?: Module) => void } ModuleCallback */
/** @typedef {(err?: Error|null, result?: Module) => void } ModuleChainCallback */
/** @typedef {(module: Module) => void} OnModuleCallback */
/** @typedef {(err?: Error|null) => void} Callback */
/** @typedef {(d: Dependency) => any} DepBlockVarDependenciesCallback */
/** @typedef {new (...args: any[]) => Dependency} DepConstructor */
/** @typedef {{apply: () => void}} Plugin */
/**
* @typedef {Object} ModuleFactoryCreateDataContextInfo
* @property {string} issuer
* @property {string} compiler
*/
/**
* @typedef {Object} ModuleFactoryCreateData
* @property {ModuleFactoryCreateDataContextInfo} contextInfo
* @property {any=} resolveOptions
* @property {string} context
* @property {Dependency[]} dependencies
*/
/**
* @typedef {Object} ModuleFactory
* @property {(data: ModuleFactoryCreateData, callback: ModuleCallback) => any} create
*/
/**
* @typedef {Object} SortedDependency
* @property {ModuleFactory} factory
* @property {Dependency[]} dependencies
*/
/**
* @typedef {Object} DependenciesBlockLike
* @property {Dependency[]} dependencies
* @property {AsyncDependenciesBlock[]} blocks
* @property {DependenciesBlockVariable[]} variables
*/
/**
* @typedef {Object} LogEntry
* @property {string} type
* @property {any[]} args
* @property {number} time
* @property {string[]=} trace
*/
/**
* @typedef {Object} AssetInfo
* @property {boolean=} immutable true, if the asset can be long term cached forever (contains a hash)
* @property {number=} size size in bytes, only set after asset has been emitted
* @property {boolean=} development true, when asset is only used for development and doesn't count towards user-facing assets
* @property {boolean=} hotModuleReplacement true, when asset ships data for updating an existing application (HMR)
*/
/**
* @typedef {Object} Asset
* @property {string} name the filename of the asset
* @property {Source} source source of the asset
* @property {AssetInfo} info info about the asset
*/
/**
* @param {Chunk} a first chunk to sort by id
* @param {Chunk} b second chunk to sort by id
* @returns {-1|0|1} sort value
*/
const byId = (a, b) => {
if (typeof a.id !== typeof b.id) {
return typeof a.id < typeof b.id ? -1 : 1;
}
if (a.id < b.id) return -1;
if (a.id > b.id) return 1;
return 0;
};
/**
* @param {Module} a first module to sort by
* @param {Module} b second module to sort by
* @returns {-1|0|1} sort value
*/
const byIdOrIdentifier = (a, b) => {
if (typeof a.id !== typeof b.id) {
return typeof a.id < typeof b.id ? -1 : 1;
}
if (a.id < b.id) return -1;
if (a.id > b.id) return 1;
const identA = a.identifier();
const identB = b.identifier();
if (identA < identB) return -1;
if (identA > identB) return 1;
return 0;
};
/**
* @param {Module} a first module to sort by
* @param {Module} b second module to sort by
* @returns {-1|0|1} sort value
*/
const byIndexOrIdentifier = (a, b) => {
if (a.index < b.index) return -1;
if (a.index > b.index) return 1;
const identA = a.identifier();
const identB = b.identifier();
if (identA < identB) return -1;
if (identA > identB) return 1;
return 0;
};
/**
* @param {Compilation} a first compilation to sort by
* @param {Compilation} b second compilation to sort by
* @returns {-1|0|1} sort value
*/
const byNameOrHash = (a, b) => {
if (a.name < b.name) return -1;
if (a.name > b.name) return 1;
if (a.fullHash < b.fullHash) return -1;
if (a.fullHash > b.fullHash) return 1;
return 0;
};
/**
* @param {DependenciesBlockVariable[]} variables DepBlock Variables to iterate over
* @param {DepBlockVarDependenciesCallback} fn callback to apply on iterated elements
* @returns {void}
*/
const iterationBlockVariable = (variables, fn) => {
for (
let indexVariable = 0;
indexVariable < variables.length;
indexVariable++
) {
const varDep = variables[indexVariable].dependencies;
for (let indexVDep = 0; indexVDep < varDep.length; indexVDep++) {
fn(varDep[indexVDep]);
}
}
};
/**
* @template T
* @param {T[]} arr array of elements to iterate over
* @param {function(T): void} fn callback applied to each element
* @returns {void}
*/
const iterationOfArrayCallback = (arr, fn) => {
for (let index = 0; index < arr.length; index++) {
fn(arr[index]);
}
};
/**
* @template T
* @param {Set<T>} set set to add items to
* @param {Set<T>} otherSet set to add items from
* @returns {void}
*/
const addAllToSet = (set, otherSet) => {
for (const item of otherSet) {
set.add(item);
}
};
/**
* @param {Source} a a source
* @param {Source} b another source
* @returns {boolean} true, when both sources are equal
*/
const isSourceEqual = (a, b) => {
if (a === b) return true;
// TODO webpack 5: check .buffer() instead, it's called anyway during emit
/** @type {Buffer|string} */
let aSource = a.source();
/** @type {Buffer|string} */
let bSource = b.source();
if (aSource === bSource) return true;
if (typeof aSource === "string" && typeof bSource === "string") return false;
if (!Buffer.isBuffer(aSource)) aSource = Buffer.from(aSource, "utf-8");
if (!Buffer.isBuffer(bSource)) bSource = Buffer.from(bSource, "utf-8");
return aSource.equals(bSource);
};
class Compilation extends Tapable {
/**
* Creates an instance of Compilation.
* @param {Compiler} compiler the compiler which created the compilation
*/
constructor(compiler) {
super();
this.hooks = {
/** @type {SyncHook<Module>} */
buildModule: new SyncHook(["module"]),
/** @type {SyncHook<Module>} */
rebuildModule: new SyncHook(["module"]),
/** @type {SyncHook<Module, Error>} */
failedModule: new SyncHook(["module", "error"]),
/** @type {SyncHook<Module>} */
succeedModule: new SyncHook(["module"]),
/** @type {SyncHook<Dependency, string>} */
addEntry: new SyncHook(["entry", "name"]),
/** @type {SyncHook<Dependency, string, Error>} */
failedEntry: new SyncHook(["entry", "name", "error"]),
/** @type {SyncHook<Dependency, string, Module>} */
succeedEntry: new SyncHook(["entry", "name", "module"]),
/** @type {SyncWaterfallHook<DependencyReference, Dependency, Module>} */
dependencyReference: new SyncWaterfallHook([
"dependencyReference",
"dependency",
"module"
]),
/** @type {AsyncSeriesHook<Module[]>} */
finishModules: new AsyncSeriesHook(["modules"]),
/** @type {SyncHook<Module>} */
finishRebuildingModule: new SyncHook(["module"]),
/** @type {SyncHook} */
unseal: new SyncHook([]),
/** @type {SyncHook} */
seal: new SyncHook([]),
/** @type {SyncHook} */
beforeChunks: new SyncHook([]),
/** @type {SyncHook<Chunk[]>} */
afterChunks: new SyncHook(["chunks"]),
/** @type {SyncBailHook<Module[]>} */
optimizeDependenciesBasic: new SyncBailHook(["modules"]),
/** @type {SyncBailHook<Module[]>} */
optimizeDependencies: new SyncBailHook(["modules"]),
/** @type {SyncBailHook<Module[]>} */
optimizeDependenciesAdvanced: new SyncBailHook(["modules"]),
/** @type {SyncBailHook<Module[]>} */
afterOptimizeDependencies: new SyncHook(["modules"]),
/** @type {SyncHook} */
optimize: new SyncHook([]),
/** @type {SyncBailHook<Module[]>} */
optimizeModulesBasic: new SyncBailHook(["modules"]),
/** @type {SyncBailHook<Module[]>} */
optimizeModules: new SyncBailHook(["modules"]),
/** @type {SyncBailHook<Module[]>} */
optimizeModulesAdvanced: new SyncBailHook(["modules"]),
/** @type {SyncHook<Module[]>} */
afterOptimizeModules: new SyncHook(["modules"]),
/** @type {SyncBailHook<Chunk[], ChunkGroup[]>} */
optimizeChunksBasic: new SyncBailHook(["chunks", "chunkGroups"]),
/** @type {SyncBailHook<Chunk[], ChunkGroup[]>} */
optimizeChunks: new SyncBailHook(["chunks", "chunkGroups"]),
/** @type {SyncBailHook<Chunk[], ChunkGroup[]>} */
optimizeChunksAdvanced: new SyncBailHook(["chunks", "chunkGroups"]),
/** @type {SyncHook<Chunk[], ChunkGroup[]>} */
afterOptimizeChunks: new SyncHook(["chunks", "chunkGroups"]),
/** @type {AsyncSeriesHook<Chunk[], Module[]>} */
optimizeTree: new AsyncSeriesHook(["chunks", "modules"]),
/** @type {SyncHook<Chunk[], Module[]>} */
afterOptimizeTree: new SyncHook(["chunks", "modules"]),
/** @type {SyncBailHook<Chunk[], Module[]>} */
optimizeChunkModulesBasic: new SyncBailHook(["chunks", "modules"]),
/** @type {SyncBailHook<Chunk[], Module[]>} */
optimizeChunkModules: new SyncBailHook(["chunks", "modules"]),
/** @type {SyncBailHook<Chunk[], Module[]>} */
optimizeChunkModulesAdvanced: new SyncBailHook(["chunks", "modules"]),
/** @type {SyncHook<Chunk[], Module[]>} */
afterOptimizeChunkModules: new SyncHook(["chunks", "modules"]),
/** @type {SyncBailHook} */
shouldRecord: new SyncBailHook([]),
/** @type {SyncHook<Module[], any>} */
reviveModules: new SyncHook(["modules", "records"]),
/** @type {SyncHook<Module[]>} */
optimizeModuleOrder: new SyncHook(["modules"]),
/** @type {SyncHook<Module[]>} */
advancedOptimizeModuleOrder: new SyncHook(["modules"]),
/** @type {SyncHook<Module[]>} */
beforeModuleIds: new SyncHook(["modules"]),
/** @type {SyncHook<Module[]>} */
moduleIds: new SyncHook(["modules"]),
/** @type {SyncHook<Module[]>} */
optimizeModuleIds: new SyncHook(["modules"]),
/** @type {SyncHook<Module[]>} */
afterOptimizeModuleIds: new SyncHook(["modules"]),
/** @type {SyncHook<Chunk[], any>} */
reviveChunks: new SyncHook(["chunks", "records"]),
/** @type {SyncHook<Chunk[]>} */
optimizeChunkOrder: new SyncHook(["chunks"]),
/** @type {SyncHook<Chunk[]>} */
beforeChunkIds: new SyncHook(["chunks"]),
/** @type {SyncHook<Chunk[]>} */
optimizeChunkIds: new SyncHook(["chunks"]),
/** @type {SyncHook<Chunk[]>} */
afterOptimizeChunkIds: new SyncHook(["chunks"]),
/** @type {SyncHook<Module[], any>} */
recordModules: new SyncHook(["modules", "records"]),
/** @type {SyncHook<Chunk[], any>} */
recordChunks: new SyncHook(["chunks", "records"]),
/** @type {SyncHook} */
beforeHash: new SyncHook([]),
/** @type {SyncHook<Chunk>} */
contentHash: new SyncHook(["chunk"]),
/** @type {SyncHook} */
afterHash: new SyncHook([]),
/** @type {SyncHook<any>} */
recordHash: new SyncHook(["records"]),
/** @type {SyncHook<Compilation, any>} */
record: new SyncHook(["compilation", "records"]),
/** @type {SyncHook} */
beforeModuleAssets: new SyncHook([]),
/** @type {SyncBailHook} */
shouldGenerateChunkAssets: new SyncBailHook([]),
/** @type {SyncHook} */
beforeChunkAssets: new SyncHook([]),
/** @type {SyncHook<Chunk[]>} */
additionalChunkAssets: new SyncHook(["chunks"]),
/** @type {AsyncSeriesHook} */
additionalAssets: new AsyncSeriesHook([]),
/** @type {AsyncSeriesHook<Chunk[]>} */
optimizeChunkAssets: new AsyncSeriesHook(["chunks"]),
/** @type {SyncHook<Chunk[]>} */
afterOptimizeChunkAssets: new SyncHook(["chunks"]),
/** @type {AsyncSeriesHook<CompilationAssets>} */
optimizeAssets: new AsyncSeriesHook(["assets"]),
/** @type {SyncHook<CompilationAssets>} */
afterOptimizeAssets: new SyncHook(["assets"]),
/** @type {SyncBailHook} */
needAdditionalSeal: new SyncBailHook([]),
/** @type {AsyncSeriesHook} */
afterSeal: new AsyncSeriesHook([]),
/** @type {SyncHook<Chunk, Hash>} */
chunkHash: new SyncHook(["chunk", "chunkHash"]),
/** @type {SyncHook<Module, string>} */
moduleAsset: new SyncHook(["module", "filename"]),
/** @type {SyncHook<Chunk, string>} */
chunkAsset: new SyncHook(["chunk", "filename"]),
/** @type {SyncWaterfallHook<string, TODO>} */
assetPath: new SyncWaterfallHook(["filename", "data"]), // TODO MainTemplate
/** @type {SyncBailHook} */
needAdditionalPass: new SyncBailHook([]),
/** @type {SyncHook<Compiler, string, number>} */
childCompiler: new SyncHook([
"childCompiler",
"compilerName",
"compilerIndex"
]),
/** @type {SyncBailHook<string, LogEntry>} */
log: new SyncBailHook(["origin", "logEntry"]),
// TODO the following hooks are weirdly located here
// TODO move them for webpack 5
/** @type {SyncHook<object, Module>} */
normalModuleLoader: new SyncHook(["loaderContext", "module"]),
/** @type {SyncBailHook<Chunk[]>} */
optimizeExtractedChunksBasic: new SyncBailHook(["chunks"]),
/** @type {SyncBailHook<Chunk[]>} */
optimizeExtractedChunks: new SyncBailHook(["chunks"]),
/** @type {SyncBailHook<Chunk[]>} */
optimizeExtractedChunksAdvanced: new SyncBailHook(["chunks"]),
/** @type {SyncHook<Chunk[]>} */
afterOptimizeExtractedChunks: new SyncHook(["chunks"])
};
this._pluginCompat.tap("Compilation", options => {
switch (options.name) {
case "optimize-tree":
case "additional-assets":
case "optimize-chunk-assets":
case "optimize-assets":
case "after-seal":
options.async = true;
break;
}
});
/** @type {string=} */
this.name = undefined;
/** @type {Compiler} */
this.compiler = compiler;
this.resolverFactory = compiler.resolverFactory;
this.inputFileSystem = compiler.inputFileSystem;
this.requestShortener = compiler.requestShortener;
const options = compiler.options;
this.options = options;
this.outputOptions = options && options.output;
/** @type {boolean=} */
this.bail = options && options.bail;
this.profile = options && options.profile;
this.performance = options && options.performance;
this.mainTemplate = new MainTemplate(this.outputOptions);
this.chunkTemplate = new ChunkTemplate(this.outputOptions);
this.hotUpdateChunkTemplate = new HotUpdateChunkTemplate(
this.outputOptions
);
this.runtimeTemplate = new RuntimeTemplate(
this.outputOptions,
this.requestShortener
);
this.moduleTemplates = {
javascript: new ModuleTemplate(this.runtimeTemplate, "javascript"),
webassembly: new ModuleTemplate(this.runtimeTemplate, "webassembly")
};
this.semaphore = new Semaphore(options.parallelism || 100);
this.entries = [];
/** @private @type {{name: string, request: string, module: Module}[]} */
this._preparedEntrypoints = [];
/** @type {Map<string, Entrypoint>} */
this.entrypoints = new Map();
/** @type {Chunk[]} */
this.chunks = [];
/** @type {ChunkGroup[]} */
this.chunkGroups = [];
/** @type {Map<string, ChunkGroup>} */
this.namedChunkGroups = new Map();
/** @type {Map<string, Chunk>} */
this.namedChunks = new Map();
/** @type {Module[]} */
this.modules = [];
/** @private @type {Map<string, Module>} */
this._modules = new Map();
this.cache = null;
this.records = null;
/** @type {string[]} */
this.additionalChunkAssets = [];
/** @type {CompilationAssets} */
this.assets = {};
/** @type {Map<string, AssetInfo>} */
this.assetsInfo = new Map();
/** @type {WebpackError[]} */
this.errors = [];
/** @type {WebpackError[]} */
this.warnings = [];
/** @type {Compilation[]} */
this.children = [];
/** @type {Map<string, LogEntry[]>} */
this.logging = new Map();
/** @type {Map<DepConstructor, ModuleFactory>} */
this.dependencyFactories = new Map();
/** @type {Map<DepConstructor, DependencyTemplate>} */
this.dependencyTemplates = new Map();
// TODO refactor this in webpack 5 to a custom DependencyTemplates class with a hash property
// @ts-ignore
this.dependencyTemplates.set("hash", "");
this.childrenCounters = {};
/** @type {Set<number|string>} */
this.usedChunkIds = null;
/** @type {Set<number>} */
this.usedModuleIds = null;
/** @type {Map<string, number>=} */
this.fileTimestamps = undefined;
/** @type {Map<string, number>=} */
this.contextTimestamps = undefined;
/** @type {Set<string>=} */
this.compilationDependencies = undefined;
/** @private @type {Map<Module, Callback[]>} */
this._buildingModules = new Map();
/** @private @type {Map<Module, Callback[]>} */
this._rebuildingModules = new Map();
/** @type {Set<string>} */
this.emittedAssets = new Set();
}
getStats() {
return new Stats(this);
}
/**
* @param {string | (function(): string)} name name of the logger, or function called once to get the logger name
* @returns {Logger} a logger with that name
*/
getLogger(name) {
if (!name) {
throw new TypeError("Compilation.getLogger(name) called without a name");
}
/** @type {LogEntry[] | undefined} */
let logEntries;
return new Logger((type, args) => {
if (typeof name === "function") {
name = name();
if (!name) {
throw new TypeError(
"Compilation.getLogger(name) called with a function not returning a name"
);
}
}
let trace;
switch (type) {
case LogType.warn:
case LogType.error:
case LogType.trace:
trace = ErrorHelpers.cutOffLoaderExecution(new Error("Trace").stack)
.split("\n")
.slice(3);
break;
}
/** @type {LogEntry} */
const logEntry = {
time: Date.now(),
type,
args,
trace
};
if (this.hooks.log.call(name, logEntry) === undefined) {
if (logEntry.type === LogType.profileEnd) {
// eslint-disable-next-line node/no-unsupported-features/node-builtins
if (typeof console.profileEnd === "function") {
// eslint-disable-next-line node/no-unsupported-features/node-builtins
console.profileEnd(`[${name}] ${logEntry.args[0]}`);
}
}
if (logEntries === undefined) {
logEntries = this.logging.get(name);
if (logEntries === undefined) {
logEntries = [];
this.logging.set(name, logEntries);
}
}
logEntries.push(logEntry);
if (logEntry.type === LogType.profile) {
// eslint-disable-next-line node/no-unsupported-features/node-builtins
if (typeof console.profile === "function") {
// eslint-disable-next-line node/no-unsupported-features/node-builtins
console.profile(`[${name}] ${logEntry.args[0]}`);
}
}
}
});
}
/**
* @typedef {Object} AddModuleResult
* @property {Module} module the added or existing module
* @property {boolean} issuer was this the first request for this module
* @property {boolean} build should the module be build
* @property {boolean} dependencies should dependencies be walked
*/
/**
* @param {Module} module module to be added that was created
* @param {any=} cacheGroup cacheGroup it is apart of
* @returns {AddModuleResult} returns meta about whether or not the module had built
* had an issuer, or any dependnecies
*/
addModule(module, cacheGroup) {
// luyongfang identifier = request
const identifier = module.identifier();
const alreadyAddedModule = this._modules.get(identifier);
if (alreadyAddedModule) {
return {
module: alreadyAddedModule,
issuer: false,
build: false,
dependencies: false
};
}
const cacheName = (cacheGroup || "m") + identifier;
if (this.cache && this.cache[cacheName]) {
const cacheModule = this.cache[cacheName];
if (typeof cacheModule.updateCacheModule === "function") {
cacheModule.updateCacheModule(module);
}
let rebuild = true;
if (this.fileTimestamps && this.contextTimestamps) {
rebuild = cacheModule.needRebuild(
this.fileTimestamps,
this.contextTimestamps
);
}
if (!rebuild) {
cacheModule.disconnect();
this._modules.set(identifier, cacheModule);
this.modules.push(cacheModule);
for (const err of cacheModule.errors) {
this.errors.push(err);
}
for (const err of cacheModule.warnings) {
this.warnings.push(err);
}
return {
module: cacheModule,
issuer: true,
build: false,
dependencies: true
};
}
cacheModule.unbuild();
module = cacheModule;
}
/** luyongfang */
/**
* 0. this._modules中存放了以request为key的module
* 1. 如果已经加入过this._modules中代表该模块已经添加过，否则是全新的module还未被加入
* 2. issuer
*/
this._modules.set(identifier, module);
if (this.cache) {
this.cache[cacheName] = module;
}
this.modules.push(module);
return {
module: module,
issuer: true,
build: true,
dependencies: true
};
}
/**
* Fetches a module from a compilation by its identifier
* @param {Module} module the module provided
* @returns {Module} the module requested
*/
getModule(module) {
const identifier = module.identifier();
return this._modules.get(identifier);
}
/**
* Attempts to search for a module by its identifier
* @param {string} identifier identifier (usually path) for module
* @returns {Module|undefined} attempt to search for module and return it, else undefined
*/
findModule(identifier) {
return this._modules.get(identifier);
}
/**
* @param {Module} module module with its callback list
* @param {Callback} callback the callback function
* @returns {void}
*/
waitForBuildingFinished(module, callback) {
let callbackList = this._buildingModules.get(module);
if (callbackList) {
callbackList.push(() => callback());
} else {
process.nextTick(callback);
}
}
/**
* Builds the module object
*
* @param {Module} module module to be built
* @param {boolean} optional optional flag
* @param {Module=} origin origin module this module build was requested from
* @param {Dependency[]=} dependencies optional dependencies from the module to be built
* @param {TODO} thisCallback the callback
* @returns {TODO} returns the callback function with results
*/
buildModule(module, optional, origin, dependencies, thisCallback) {
let callbackList = this._buildingModules.get(module);
if (callbackList) {
callbackList.push(thisCallback);
return;
}
this._buildingModules.set(module, (callbackList = [thisCallback]));
const callback = err => {
this._buildingModules.delete(module);
for (const cb of callbackList) {
cb(err);
}
};
/** luyongfang 在buildModule生命周期内，调用用户注册过的钩子 */
/**
* 1. webpack.config.js中配置plugins数组
* 2. 在webpack/lib/webpack.js中 判断options.plugins, 然后执行哥哥plugin的apply方法
* 3. 如plugin中 注册了compiler.hooks.compile.tap('testPlugin', fn), compiler是new Compiler()实例,
* compiler.hooks是实例的全局对象, compiler.hooks.compile指向了Tapable的hooks。 然后调用tapable的tap事件注册[{type: 'sync', name: 'TestPlugin', fn: fn}]
* 4. 在如buildModule等特定生命周期进行调用，注册的plugin Hooks
* 5. 如在compiler阶段 this.hooks.compile.call(params); this.hooks.make.callAsync(),
* 6. 如在compilation阶段 this.hooks.optimizeChunks compilation.hooks.**钩子等调用
*/
this.hooks.buildModule.call(module);
module.build(
this.options,
this,
this.resolverFactory.get("normal", module.resolveOptions),
this.inputFileSystem,
error => {
const errors = module.errors;
for (let indexError = 0; indexError < errors.length; indexError++) {
const err = errors[indexError];
err.origin = origin;
err.dependencies = dependencies;
if (optional) {
this.warnings.push(err);
} else {
this.errors.push(err);
}
}
const warnings = module.warnings;
for (
let indexWarning = 0;
indexWarning < warnings.length;
indexWarning++
) {
const war = warnings[indexWarning];
war.origin = origin;
war.dependencies = dependencies;
this.warnings.push(war);
}
const originalMap = module.dependencies.reduce((map, v, i) => {
map.set(v, i);
return map;
}, new Map());
module.dependencies.sort((a, b) => {
const cmp = compareLocations(a.loc, b.loc);
if (cmp) return cmp;
return originalMap.get(a) - originalMap.get(b);
});
if (error) {
this.hooks.failedModule.call(module, error);
return callback(error);
}
this.hooks.succeedModule.call(module);
return callback();
}
);
}
/**
* @param {Module} module to be processed for deps
* @param {ModuleCallback} callback callback to be triggered
* @returns {void}
*/
processModuleDependencies(module, callback) {
const dependencies = new Map();
/** luyongfang 不懂这里的module.dependencies 不是个boolea值么，为什么这里会是数组呢*/
const addDependency = dep => {
const resourceIdent = dep.getResourceIdentifier();
if (resourceIdent) {
const factory = this.dependencyFactories.get(dep.constructor);
if (factory === undefined) {
throw new Error(
`No module factory available for dependency type: ${dep.constructor.name}`
);
}
let innerMap = dependencies.get(factory);
if (innerMap === undefined) {
dependencies.set(factory, (innerMap = new Map()));
}
let list = innerMap.get(resourceIdent);
if (list === undefined) innerMap.set(resourceIdent, (list = []));
list.push(dep);
}
};
const addDependenciesBlock = block => {
if (block.dependencies) {
iterationOfArrayCallback(block.dependencies, addDependency);
}
if (block.blocks) {
iterationOfArrayCallback(block.blocks, addDependenciesBlock);
}
if (block.variables) {
iterationBlockVariable(block.variables, addDependency);
}
};
try {
addDependenciesBlock(module);
} catch (e) {
callback(e);
}
const sortedDependencies = [];
for (const pair1 of dependencies) {
for (const pair2 of pair1[1]) {
sortedDependencies.push({
factory: pair1[0],
dependencies: pair2[1]
});
}
}
this.addModuleDependencies(
module,
sortedDependencies,
this.bail,
null,
true,
callback
);
}
/**
* @param {Module} module module to add deps to
* @param {SortedDependency[]} dependencies set of sorted dependencies to iterate through
* @param {(boolean|null)=} bail whether to bail or not
* @param {TODO} cacheGroup optional cacheGroup
* @param {boolean} recursive whether it is recursive traversal
* @param {function} callback callback for when dependencies are finished being added
* @returns {void}
*/
addModuleDependencies(
module,
dependencies,
bail,
cacheGroup,
recursive,
callback
) {
const start = this.profile && Date.now();
const currentProfile = this.profile && {};
asyncLib.forEach(
dependencies,
(item, callback) => {
const dependencies = item.dependencies;
const errorAndCallback = err => {
err.origin = module;
err.dependencies = dependencies;
this.errors.push(err);
if (bail) {
callback(err);
} else {
callback();
}
};
const warningAndCallback = err => {
err.origin = module;
this.warnings.push(err);
callback();
};
const semaphore = this.semaphore;
semaphore.acquire(() => {
const factory = item.factory;
/** luyongfang 这里调用NormalModuleFactory.crete 方法，factory指向NormalModuleFactory实例*/
/**
* 1. NormalModuleFactory.crete方法中调用beforeResolver
* 2. 在回调函数中 会调用注册过 this.factory.hooks的事件，其中里面会调用3. 4
* 3. this.hooks.resolver: 而this.hooks.resolver的注册是在NormalModuleFactory实例化时。
* 4. afterResolver
* 5. this.hooks.resolver.tap 注册时会解析loaderResolver, normalResolver
*/
factory.create(
{
contextInfo: {
issuer: module.nameForCondition && module.nameForCondition(),
compiler: this.compiler.name
},
resolveOptions: module.resolveOptions,
context: module.context,
dependencies: dependencies
},
(err, dependentModule) => {
let afterFactory;
const isOptional = () => {
return dependencies.every(d => d.optional);
};
const errorOrWarningAndCallback = err => {
if (isOptional()) {
return warningAndCallback(err);
} else {
return errorAndCallback(err);
}
};
if (err) {
semaphore.release();
return errorOrWarningAndCallback(
new ModuleNotFoundError(module, err)
);
}
if (!dependentModule) {
semaphore.release();
return process.nextTick(callback);
}
if (currentProfile) {
afterFactory = Date.now();
currentProfile.factory = afterFactory - start;
}
const iterationDependencies = depend => {
for (let index = 0; index < depend.length; index++) {
const dep = depend[index];
dep.module = dependentModule;
dependentModule.addReason(module, dep);
}
};
const addModuleResult = this.addModule(
dependentModule,
cacheGroup
);
dependentModule = addModuleResult.module;
iterationDependencies(dependencies);
const afterBuild = () => {
if (recursive && addModuleResult.dependencies) {
this.processModuleDependencies(dependentModule, callback);
} else {
return callback();
}
};
if (addModuleResult.issuer) {
if (currentProfile) {
dependentModule.profile = currentProfile;
}
dependentModule.issuer = module;
} else {
if (this.profile) {
if (module.profile) {
const time = Date.now() - start;
if (
!module.profile.dependencies ||
time > module.profile.dependencies
) {
module.profile.dependencies = time;
}
}