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JavascriptModulesPlugin.js
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Sat, Feb 22, 15:28

JavascriptModulesPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { SyncWaterfallHook, SyncHook, SyncBailHook } = require("tapable");
const {
ConcatSource,
OriginalSource,
PrefixSource,
RawSource,
CachedSource
} = require("webpack-sources");
const Compilation = require("../Compilation");
const { tryRunOrWebpackError } = require("../HookWebpackError");
const HotUpdateChunk = require("../HotUpdateChunk");
const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const StringXor = require("../util/StringXor");
const { compareModulesByIdentifier } = require("../util/comparators");
const createHash = require("../util/createHash");
const { intersectRuntime } = require("../util/runtime");
const JavascriptGenerator = require("./JavascriptGenerator");
const JavascriptParser = require("./JavascriptParser");
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../CodeGenerationResults")} CodeGenerationResults */
/** @typedef {import("../Compilation").ChunkHashContext} ChunkHashContext */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../DependencyTemplates")} DependencyTemplates */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
/** @typedef {import("../util/Hash")} Hash */
/**
* @template T
* @param {Iterable<T>} iterable iterable
* @param {function(T): boolean} filter predicate
* @returns {boolean} true, if some items match the filter predicate
*/
const someInIterable = (iterable, filter) => {
for (const item of iterable) {
if (filter(item)) return true;
}
return false;
};
/**
* @param {Chunk} chunk a chunk
* @param {ChunkGraph} chunkGraph the chunk graph
* @returns {boolean} true, when a JS file is needed for this chunk
*/
const chunkHasJs = (chunk, chunkGraph) => {
if (chunkGraph.getNumberOfEntryModules(chunk) > 0) return true;
return chunkGraph.getChunkModulesIterableBySourceType(chunk, "javascript")
? true
: false;
};
/**
* @typedef {Object} RenderContext
* @property {Chunk} chunk the chunk
* @property {DependencyTemplates} dependencyTemplates the dependency templates
* @property {RuntimeTemplate} runtimeTemplate the runtime template
* @property {ModuleGraph} moduleGraph the module graph
* @property {ChunkGraph} chunkGraph the chunk graph
* @property {CodeGenerationResults} codeGenerationResults results of code generation
*/
/**
* @typedef {Object} MainRenderContext
* @property {Chunk} chunk the chunk
* @property {DependencyTemplates} dependencyTemplates the dependency templates
* @property {RuntimeTemplate} runtimeTemplate the runtime template
* @property {ModuleGraph} moduleGraph the module graph
* @property {ChunkGraph} chunkGraph the chunk graph
* @property {CodeGenerationResults} codeGenerationResults results of code generation
* @property {string} hash hash to be used for render call
*/
/**
* @typedef {Object} RenderBootstrapContext
* @property {Chunk} chunk the chunk
* @property {RuntimeTemplate} runtimeTemplate the runtime template
* @property {ModuleGraph} moduleGraph the module graph
* @property {ChunkGraph} chunkGraph the chunk graph
* @property {string} hash hash to be used for render call
*/
/**
* @typedef {Object} CompilationHooks
* @property {SyncWaterfallHook<[Source, Module, RenderContext]>} renderModuleContent
* @property {SyncWaterfallHook<[Source, Module, RenderContext]>} renderModuleContainer
* @property {SyncWaterfallHook<[Source, Module, RenderContext]>} renderModulePackage
* @property {SyncWaterfallHook<[Source, RenderContext]>} renderChunk
* @property {SyncWaterfallHook<[Source, RenderContext]>} renderMain
* @property {SyncWaterfallHook<[Source, RenderContext]>} render
* @property {SyncWaterfallHook<[string, RenderBootstrapContext]>} renderRequire
* @property {SyncHook<[Chunk, Hash, ChunkHashContext]>} chunkHash
* @property {SyncBailHook<[Chunk, RenderContext], boolean>} useSourceMap
*/
/** @type {WeakMap<Compilation, CompilationHooks>} */
const compilationHooksMap = new WeakMap();
class JavascriptModulesPlugin {
/**
* @param {Compilation} compilation the compilation
* @returns {CompilationHooks} the attached hooks
*/
static getCompilationHooks(compilation) {
if (!(compilation instanceof Compilation)) {
throw new TypeError(
"The 'compilation' argument must be an instance of Compilation"
);
}
let hooks = compilationHooksMap.get(compilation);
if (hooks === undefined) {
hooks = {
renderModuleContent: new SyncWaterfallHook([
"source",
"module",
"renderContext"
]),
renderModuleContainer: new SyncWaterfallHook([
"source",
"module",
"renderContext"
]),
renderModulePackage: new SyncWaterfallHook([
"source",
"module",
"renderContext"
]),
render: new SyncWaterfallHook(["source", "renderContext"]),
renderChunk: new SyncWaterfallHook(["source", "renderContext"]),
renderMain: new SyncWaterfallHook(["source", "renderContext"]),
renderRequire: new SyncWaterfallHook(["code", "renderContext"]),
chunkHash: new SyncHook(["chunk", "hash", "context"]),
useSourceMap: new SyncBailHook(["chunk", "renderContext"])
};
compilationHooksMap.set(compilation, hooks);
}
return hooks;
}
constructor(options = {}) {
this.options = options;
/** @type {WeakMap<Source, TODO>} */
this._moduleFactoryCache = new WeakMap();
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(
"JavascriptModulesPlugin",
(compilation, { normalModuleFactory }) => {
const hooks = JavascriptModulesPlugin.getCompilationHooks(compilation);
normalModuleFactory.hooks.createParser
.for("javascript/auto")
.tap("JavascriptModulesPlugin", options => {
return new JavascriptParser("auto");
});
normalModuleFactory.hooks.createParser
.for("javascript/dynamic")
.tap("JavascriptModulesPlugin", options => {
return new JavascriptParser("script");
});
normalModuleFactory.hooks.createParser
.for("javascript/esm")
.tap("JavascriptModulesPlugin", options => {
return new JavascriptParser("module");
});
normalModuleFactory.hooks.createGenerator
.for("javascript/auto")
.tap("JavascriptModulesPlugin", () => {
return new JavascriptGenerator();
});
normalModuleFactory.hooks.createGenerator
.for("javascript/dynamic")
.tap("JavascriptModulesPlugin", () => {
return new JavascriptGenerator();
});
normalModuleFactory.hooks.createGenerator
.for("javascript/esm")
.tap("JavascriptModulesPlugin", () => {
return new JavascriptGenerator();
});
compilation.hooks.renderManifest.tap(
"JavascriptModulesPlugin",
(result, options) => {
const {
hash,
chunk,
chunkGraph,
moduleGraph,
runtimeTemplate,
dependencyTemplates,
outputOptions,
codeGenerationResults
} = options;
const hotUpdateChunk =
chunk instanceof HotUpdateChunk ? chunk : null;
let render;
const filenameTemplate = JavascriptModulesPlugin.getChunkFilenameTemplate(
chunk,
outputOptions
);
if (hotUpdateChunk) {
render = () =>
this.renderChunk(
{
chunk,
dependencyTemplates,
runtimeTemplate,
moduleGraph,
chunkGraph,
codeGenerationResults
},
hooks
);
} else if (chunk.hasRuntime()) {
render = () =>
this.renderMain(
{
hash,
chunk,
dependencyTemplates,
runtimeTemplate,
moduleGraph,
chunkGraph,
codeGenerationResults
},
hooks,
compilation
);
} else {
if (!chunkHasJs(chunk, chunkGraph)) {
return result;
}
render = () =>
this.renderChunk(
{
chunk,
dependencyTemplates,
runtimeTemplate,
moduleGraph,
chunkGraph,
codeGenerationResults
},
hooks
);
}
result.push({
render,
filenameTemplate,
pathOptions: {
hash,
runtime: chunk.runtime,
chunk,
contentHashType: "javascript"
},
info: {
javascriptModule: compilation.runtimeTemplate.isModule()
},
identifier: hotUpdateChunk
? `hotupdatechunk${chunk.id}`
: `chunk${chunk.id}`,
hash: chunk.contentHash.javascript
});
return result;
}
);
compilation.hooks.chunkHash.tap(
"JavascriptModulesPlugin",
(chunk, hash, context) => {
hooks.chunkHash.call(chunk, hash, context);
if (chunk.hasRuntime()) {
this.updateHashWithBootstrap(
hash,
{
hash: "0000",
chunk,
chunkGraph: context.chunkGraph,
moduleGraph: context.moduleGraph,
runtimeTemplate: context.runtimeTemplate
},
hooks
);
}
}
);
compilation.hooks.contentHash.tap("JavascriptModulesPlugin", chunk => {
const {
chunkGraph,
moduleGraph,
runtimeTemplate,
outputOptions: {
hashSalt,
hashDigest,
hashDigestLength,
hashFunction
}
} = compilation;
const hash = createHash(hashFunction);
if (hashSalt) hash.update(hashSalt);
if (chunk.hasRuntime()) {
this.updateHashWithBootstrap(
hash,
{
hash: "0000",
chunk,
chunkGraph: compilation.chunkGraph,
moduleGraph: compilation.moduleGraph,
runtimeTemplate: compilation.runtimeTemplate
},
hooks
);
} else {
hash.update(`${chunk.id} `);
hash.update(chunk.ids ? chunk.ids.join(",") : "");
}
hooks.chunkHash.call(chunk, hash, {
chunkGraph,
moduleGraph,
runtimeTemplate
});
const modules = chunkGraph.getChunkModulesIterableBySourceType(
chunk,
"javascript"
);
if (modules) {
const xor = new StringXor();
for (const m of modules) {
xor.add(chunkGraph.getModuleHash(m, chunk.runtime));
}
xor.updateHash(hash);
}
const runtimeModules = chunkGraph.getChunkModulesIterableBySourceType(
chunk,
"runtime"
);
if (runtimeModules) {
const xor = new StringXor();
for (const m of runtimeModules) {
xor.add(chunkGraph.getModuleHash(m, chunk.runtime));
}
xor.updateHash(hash);
}
const digest = /** @type {string} */ (hash.digest(hashDigest));
chunk.contentHash.javascript = digest.substr(0, hashDigestLength);
});
}
);
}
static getChunkFilenameTemplate(chunk, outputOptions) {
if (chunk.filenameTemplate) {
return chunk.filenameTemplate;
} else if (chunk instanceof HotUpdateChunk) {
return outputOptions.hotUpdateChunkFilename;
} else if (chunk.canBeInitial()) {
return outputOptions.filename;
} else {
return outputOptions.chunkFilename;
}
}
/**
* @param {Module} module the rendered module
* @param {RenderContext} renderContext options object
* @param {CompilationHooks} hooks hooks
* @param {boolean | "strict"} factory true: renders as factory method, "strict": renders as factory method already in strict scope, false: pure module content
* @returns {Source} the newly generated source from rendering
*/
renderModule(module, renderContext, hooks, factory) {
const {
chunk,
chunkGraph,
runtimeTemplate,
codeGenerationResults
} = renderContext;
try {
const moduleSource = codeGenerationResults.getSource(
module,
chunk.runtime,
"javascript"
);
if (!moduleSource) return null;
const moduleSourcePostContent = tryRunOrWebpackError(
() =>
hooks.renderModuleContent.call(moduleSource, module, renderContext),
"JavascriptModulesPlugin.getCompilationHooks().renderModuleContent"
);
let moduleSourcePostContainer;
if (factory) {
const runtimeRequirements = chunkGraph.getModuleRuntimeRequirements(
module,
chunk.runtime
);
const needModule = runtimeRequirements.has(RuntimeGlobals.module);
const needExports = runtimeRequirements.has(RuntimeGlobals.exports);
const needRequire =
runtimeRequirements.has(RuntimeGlobals.require) ||
runtimeRequirements.has(RuntimeGlobals.requireScope);
const needThisAsExports = runtimeRequirements.has(
RuntimeGlobals.thisAsExports
);
const needStrict = module.buildInfo.strict && factory !== "strict";
const cacheEntry = this._moduleFactoryCache.get(
moduleSourcePostContent
);
let source;
if (
cacheEntry &&
cacheEntry.needModule === needModule &&
cacheEntry.needExports === needExports &&
cacheEntry.needRequire === needRequire &&
cacheEntry.needThisAsExports === needThisAsExports &&
cacheEntry.needStrict === needStrict
) {
source = cacheEntry.source;
} else {
const factorySource = new ConcatSource();
const args = [];
if (needExports || needRequire || needModule)
args.push(
needModule
? module.moduleArgument
: "__unused_webpack_" + module.moduleArgument
);
if (needExports || needRequire)
args.push(
needExports
? module.exportsArgument
: "__unused_webpack_" + module.exportsArgument
);
if (needRequire) args.push("__webpack_require__");
if (!needThisAsExports && runtimeTemplate.supportsArrowFunction()) {
factorySource.add("/***/ ((" + args.join(", ") + ") => {\n\n");
} else {
factorySource.add("/***/ (function(" + args.join(", ") + ") {\n\n");
}
if (needStrict) {
factorySource.add('"use strict";\n');
}
factorySource.add(moduleSourcePostContent);
factorySource.add("\n\n/***/ })");
source = new CachedSource(factorySource);
this._moduleFactoryCache.set(moduleSourcePostContent, {
source,
needModule,
needExports,
needRequire,
needThisAsExports,
needStrict
});
}
moduleSourcePostContainer = tryRunOrWebpackError(
() => hooks.renderModuleContainer.call(source, module, renderContext),
"JavascriptModulesPlugin.getCompilationHooks().renderModuleContainer"
);
} else {
moduleSourcePostContainer = moduleSourcePostContent;
}
return tryRunOrWebpackError(
() =>
hooks.renderModulePackage.call(
moduleSourcePostContainer,
module,
renderContext
),
"JavascriptModulesPlugin.getCompilationHooks().renderModulePackage"
);
} catch (e) {
e.module = module;
throw e;
}
}
/**
* @param {RenderContext} renderContext the render context
* @param {CompilationHooks} hooks hooks
* @returns {Source} the rendered source
*/
renderChunk(renderContext, hooks) {
const { chunk, chunkGraph } = renderContext;
const modules = chunkGraph.getOrderedChunkModulesIterableBySourceType(
chunk,
"javascript",
compareModulesByIdentifier
);
const moduleSources =
Template.renderChunkModules(
renderContext,
modules ? Array.from(modules) : [],
module => this.renderModule(module, renderContext, hooks, true)
) || new RawSource("{}");
let source = tryRunOrWebpackError(
() => hooks.renderChunk.call(moduleSources, renderContext),
"JavascriptModulesPlugin.getCompilationHooks().renderChunk"
);
source = tryRunOrWebpackError(
() => hooks.render.call(source, renderContext),
"JavascriptModulesPlugin.getCompilationHooks().render"
);
chunk.rendered = true;
return new ConcatSource(source, ";");
}
/**
* @param {MainRenderContext} renderContext options object
* @param {CompilationHooks} hooks hooks
* @param {Compilation} compilation the compilation
* @returns {Source} the newly generated source from rendering
*/
renderMain(renderContext, hooks, compilation) {
const { chunk, chunkGraph, runtimeTemplate } = renderContext;
const runtimeRequirements = chunkGraph.getTreeRuntimeRequirements(chunk);
const iife = runtimeTemplate.isIIFE();
const bootstrap = this.renderBootstrap(renderContext, hooks);
const useSourceMap = hooks.useSourceMap.call(chunk, renderContext);
const allModules = Array.from(
chunkGraph.getOrderedChunkModulesIterableBySourceType(
chunk,
"javascript",
compareModulesByIdentifier
) || []
);
const allStrict = allModules.every(m => m.buildInfo.strict);
let inlinedModules;
if (bootstrap.allowInlineStartup) {
inlinedModules = new Set(chunkGraph.getChunkEntryModulesIterable(chunk));
}
let source = new ConcatSource();
let prefix;
if (iife) {
if (runtimeTemplate.supportsArrowFunction()) {
source.add("/******/ (() => { // webpackBootstrap\n");
} else {
source.add("/******/ (function() { // webpackBootstrap\n");
}
prefix = "/******/ \t";
} else {
prefix = "/******/ ";
}
if (allStrict) {
source.add(prefix + '"use strict";\n');
}
const chunkModules = Template.renderChunkModules(
renderContext,
inlinedModules
? allModules.filter(m => !inlinedModules.has(m))
: allModules,
module =>
this.renderModule(
module,
renderContext,
hooks,
allStrict ? "strict" : true
),
prefix
);
if (
chunkModules ||
runtimeRequirements.has(RuntimeGlobals.moduleFactories) ||
runtimeRequirements.has(RuntimeGlobals.moduleFactoriesAddOnly)
) {
source.add(prefix + "var __webpack_modules__ = (");
source.add(chunkModules || "{}");
source.add(");\n");
source.add(
"/************************************************************************/\n"
);
}
if (bootstrap.header.length > 0) {
const header = Template.asString(bootstrap.header) + "\n";
source.add(
new PrefixSource(
prefix,
useSourceMap
? new OriginalSource(header, "webpack/bootstrap")
: new RawSource(header)
)
);
source.add(
"/************************************************************************/\n"
);
}
const runtimeModules = renderContext.chunkGraph.getChunkRuntimeModulesInOrder(
chunk
);
if (runtimeModules.length > 0) {
source.add(
new PrefixSource(
prefix,
Template.renderRuntimeModules(runtimeModules, renderContext)
)
);
source.add(
"/************************************************************************/\n"
);
// runtimeRuntimeModules calls codeGeneration
for (const module of runtimeModules) {
compilation.codeGeneratedModules.add(module);
}
}
if (inlinedModules) {
if (bootstrap.beforeStartup.length > 0) {
const beforeStartup = Template.asString(bootstrap.beforeStartup) + "\n";
source.add(
new PrefixSource(
prefix,
useSourceMap
? new OriginalSource(beforeStartup, "webpack/before-startup")
: new RawSource(beforeStartup)
)
);
}
for (const m of inlinedModules) {
const renderedModule = this.renderModule(
m,
renderContext,
hooks,
false
);
if (renderedModule) {
const innerStrict = !allStrict && m.buildInfo.strict;
const iife = innerStrict || inlinedModules.size > 1 || chunkModules;
if (iife) {
if (runtimeTemplate.supportsArrowFunction()) {
source.add("(() => {\n");
if (innerStrict) source.add('"use strict";\n');
source.add(renderedModule);
source.add("\n})();\n\n");
} else {
source.add("!function() {\n");
if (innerStrict) source.add('"use strict";\n');
source.add(renderedModule);
source.add("\n}();\n");
}
} else {
source.add(renderedModule);
source.add("\n");
}
}
}
if (bootstrap.afterStartup.length > 0) {
const afterStartup = Template.asString(bootstrap.afterStartup) + "\n";
source.add(
new PrefixSource(
prefix,
useSourceMap
? new OriginalSource(afterStartup, "webpack/after-startup")
: new RawSource(afterStartup)
)
);
}
} else {
const startup =
Template.asString([
...bootstrap.beforeStartup,
...bootstrap.startup,
...bootstrap.afterStartup
]) + "\n";
source.add(
new PrefixSource(
prefix,
useSourceMap
? new OriginalSource(startup, "webpack/startup")
: new RawSource(startup)
)
);
}
if (iife) {
source.add("/******/ })()\n");
}
/** @type {Source} */
let finalSource = tryRunOrWebpackError(
() => hooks.renderMain.call(source, renderContext),
"JavascriptModulesPlugin.getCompilationHooks().renderMain"
);
if (!finalSource) {
throw new Error(
"JavascriptModulesPlugin error: JavascriptModulesPlugin.getCompilationHooks().renderMain plugins should return something"
);
}
finalSource = tryRunOrWebpackError(
() => hooks.render.call(finalSource, renderContext),
"JavascriptModulesPlugin.getCompilationHooks().render"
);
if (!finalSource) {
throw new Error(
"JavascriptModulesPlugin error: JavascriptModulesPlugin.getCompilationHooks().render plugins should return something"
);
}
chunk.rendered = true;
return iife ? new ConcatSource(finalSource, ";") : finalSource;
}
/**
* @param {Hash} hash the hash to be updated
* @param {RenderBootstrapContext} renderContext options object
* @param {CompilationHooks} hooks hooks
*/
updateHashWithBootstrap(hash, renderContext, hooks) {
const bootstrap = this.renderBootstrap(renderContext, hooks);
for (const key of Object.keys(bootstrap)) {
hash.update(key);
if (Array.isArray(bootstrap[key])) {
for (const line of bootstrap[key]) {
hash.update(line);
}
} else {
hash.update(JSON.stringify(bootstrap[key]));
}
}
}
/**
* @param {RenderBootstrapContext} renderContext options object
* @param {CompilationHooks} hooks hooks
* @returns {{ header: string[], beforeStartup: string[], startup: string[], afterStartup: string[], allowInlineStartup: boolean }} the generated source of the bootstrap code
*/
renderBootstrap(renderContext, hooks) {
const { chunkGraph, moduleGraph, chunk, runtimeTemplate } = renderContext;
const runtimeRequirements = chunkGraph.getTreeRuntimeRequirements(chunk);
const requireFunction = runtimeRequirements.has(RuntimeGlobals.require);
const moduleCache = runtimeRequirements.has(RuntimeGlobals.moduleCache);
const moduleFactories = runtimeRequirements.has(
RuntimeGlobals.moduleFactories
);
const moduleUsed = runtimeRequirements.has(RuntimeGlobals.module);
const exportsUsed = runtimeRequirements.has(RuntimeGlobals.exports);
const requireScopeUsed = runtimeRequirements.has(
RuntimeGlobals.requireScope
);
const interceptModuleExecution = runtimeRequirements.has(
RuntimeGlobals.interceptModuleExecution
);
const returnExportsFromRuntime = runtimeRequirements.has(
RuntimeGlobals.returnExportsFromRuntime
);
const useRequire =
requireFunction ||
interceptModuleExecution ||
returnExportsFromRuntime ||
moduleUsed ||
exportsUsed;
const result = {
header: [],
beforeStartup: [],
startup: [],
afterStartup: [],
allowInlineStartup: true
};
let { header: buf, startup, beforeStartup, afterStartup } = result;
if (result.allowInlineStartup && moduleFactories) {
startup.push(
"// module factories are used so entry inlining is disabled"
);
result.allowInlineStartup = false;
}
if (result.allowInlineStartup && moduleCache) {
startup.push("// module cache are used so entry inlining is disabled");
result.allowInlineStartup = false;
}
if (result.allowInlineStartup && interceptModuleExecution) {
startup.push(
"// module execution is intercepted so entry inlining is disabled"
);
result.allowInlineStartup = false;
}
if (result.allowInlineStartup && returnExportsFromRuntime) {
startup.push(
"// module exports must be returned from runtime so entry inlining is disabled"
);
result.allowInlineStartup = false;
}
if (useRequire || moduleCache) {
buf.push("// The module cache");
buf.push("var __webpack_module_cache__ = {};");
buf.push("");
}
if (useRequire) {
buf.push("// The require function");
buf.push(`function __webpack_require__(moduleId) {`);
buf.push(Template.indent(this.renderRequire(renderContext, hooks)));
buf.push("}");
buf.push("");
} else if (runtimeRequirements.has(RuntimeGlobals.requireScope)) {
buf.push("// The require scope");
buf.push("var __webpack_require__ = {};");
buf.push("");
}
if (
moduleFactories ||
runtimeRequirements.has(RuntimeGlobals.moduleFactoriesAddOnly)
) {
buf.push("// expose the modules object (__webpack_modules__)");
buf.push(`${RuntimeGlobals.moduleFactories} = __webpack_modules__;`);
buf.push("");
}
if (moduleCache) {
buf.push("// expose the module cache");
buf.push(`${RuntimeGlobals.moduleCache} = __webpack_module_cache__;`);
buf.push("");
}
if (interceptModuleExecution) {
buf.push("// expose the module execution interceptor");
buf.push(`${RuntimeGlobals.interceptModuleExecution} = [];`);
buf.push("");
}
if (!runtimeRequirements.has(RuntimeGlobals.startupNoDefault)) {
if (chunkGraph.getNumberOfEntryModules(chunk) > 0) {
/** @type {string[]} */
const buf2 = [];
const runtimeRequirements = chunkGraph.getTreeRuntimeRequirements(
chunk
);
buf2.push(
returnExportsFromRuntime
? "// Load entry module and return exports"
: "// Load entry module"
);
let i = chunkGraph.getNumberOfEntryModules(chunk);
for (const entryModule of chunkGraph.getChunkEntryModulesIterable(
chunk
)) {
if (
result.allowInlineStartup &&
someInIterable(
moduleGraph.getIncomingConnections(entryModule),
c =>
c.originModule &&
c.isTargetActive(chunk.runtime) &&
someInIterable(
chunkGraph.getModuleRuntimes(c.originModule),
runtime =>
intersectRuntime(runtime, chunk.runtime) !== undefined
)
)
) {
buf2.push(
"// This entry module is referenced by other modules so it can't be inlined"
);
result.allowInlineStartup = false;
}
const mayReturn =
--i === 0 && returnExportsFromRuntime ? "return " : "";
const moduleId = chunkGraph.getModuleId(entryModule);
const entryRuntimeRequirements = chunkGraph.getModuleRuntimeRequirements(
entryModule,
chunk.runtime
);
let moduleIdExpr = JSON.stringify(moduleId);
if (runtimeRequirements.has(RuntimeGlobals.entryModuleId)) {
moduleIdExpr = `${RuntimeGlobals.entryModuleId} = ${moduleIdExpr}`;
}
if (useRequire) {
buf2.push(`${mayReturn}__webpack_require__(${moduleIdExpr});`);
if (result.allowInlineStartup) {
if (entryRuntimeRequirements.has(RuntimeGlobals.module)) {
result.allowInlineStartup = false;
buf2.push(
"// This entry module used 'module' so it can't be inlined"
);
} else if (entryRuntimeRequirements.has(RuntimeGlobals.exports)) {
buf2.push(
"// This entry module used 'exports' so it can't be inlined"
);
result.allowInlineStartup = false;
}
}
} else if (requireScopeUsed) {
buf2.push(
`__webpack_modules__[${moduleIdExpr}](0, 0, __webpack_require__);`
);
} else {
buf2.push(`__webpack_modules__[${moduleIdExpr}]();`);
}
}
if (
runtimeRequirements.has(RuntimeGlobals.startup) ||
((returnExportsFromRuntime ||
runtimeRequirements.has(RuntimeGlobals.startupOnlyBefore)) &&
runtimeRequirements.has(RuntimeGlobals.startupOnlyAfter))
) {
result.allowInlineStartup = false;
buf.push("// the startup function");
buf.push(
`${RuntimeGlobals.startup} = ${runtimeTemplate.basicFunction(
"",
buf2
)};`
);
buf.push("");
startup.push("// run startup");
startup.push(`return ${RuntimeGlobals.startup}();`);
} else if (runtimeRequirements.has(RuntimeGlobals.startupOnlyBefore)) {
buf.push("// the startup function");
buf.push(
`${RuntimeGlobals.startup} = ${runtimeTemplate.emptyFunction()};`
);
beforeStartup.push("// run runtime startup");
beforeStartup.push(`${RuntimeGlobals.startup}();`);
startup.push("// startup");
startup.push(Template.asString(buf2));
} else if (runtimeRequirements.has(RuntimeGlobals.startupOnlyAfter)) {
buf.push("// the startup function");
buf.push(
`${RuntimeGlobals.startup} = ${runtimeTemplate.emptyFunction()};`
);
startup.push("// startup");
startup.push(Template.asString(buf2));
afterStartup.push("// run runtime startup");
afterStartup.push(`return ${RuntimeGlobals.startup}();`);
} else {
startup.push("// startup");
startup.push(Template.asString(buf2));
}
} else if (
runtimeRequirements.has(RuntimeGlobals.startup) ||
runtimeRequirements.has(RuntimeGlobals.startupOnlyBefore) ||
runtimeRequirements.has(RuntimeGlobals.startupOnlyAfter)
) {
buf.push(
"// the startup function",
"// It's empty as no entry modules are in this chunk",
`${RuntimeGlobals.startup} = ${runtimeTemplate.emptyFunction()}`,
""
);
}
} else if (
runtimeRequirements.has(RuntimeGlobals.startup) ||
runtimeRequirements.has(RuntimeGlobals.startupOnlyBefore) ||
runtimeRequirements.has(RuntimeGlobals.startupOnlyAfter)
) {
result.allowInlineStartup = false;
buf.push(
"// the startup function",
"// It's empty as some runtime module handles the default behavior",
`${RuntimeGlobals.startup} = ${runtimeTemplate.emptyFunction()}`
);
startup.push("// run startup");
startup.push(`return ${RuntimeGlobals.startup}();`);
}
return result;
}
/**
* @param {RenderBootstrapContext} renderContext options object
* @param {CompilationHooks} hooks hooks
* @returns {string} the generated source of the require function
*/
renderRequire(renderContext, hooks) {
const {
chunk,
chunkGraph,
runtimeTemplate: { outputOptions }
} = renderContext;
const runtimeRequirements = chunkGraph.getTreeRuntimeRequirements(chunk);
const moduleExecution = runtimeRequirements.has(
RuntimeGlobals.interceptModuleExecution
)
? Template.asString([
"var execOptions = { id: moduleId, module: module, factory: __webpack_modules__[moduleId], require: __webpack_require__ };",
`${RuntimeGlobals.interceptModuleExecution}.forEach(function(handler) { handler(execOptions); });`,
"module = execOptions.module;",
"execOptions.factory.call(module.exports, module, module.exports, execOptions.require);"
])
: runtimeRequirements.has(RuntimeGlobals.thisAsExports)
? Template.asString([
"__webpack_modules__[moduleId].call(module.exports, module, module.exports, __webpack_require__);"
])
: Template.asString([
"__webpack_modules__[moduleId](module, module.exports, __webpack_require__);"
]);
const needModuleId = runtimeRequirements.has(RuntimeGlobals.moduleId);
const needModuleLoaded = runtimeRequirements.has(
RuntimeGlobals.moduleLoaded
);
const content = Template.asString([
"// Check if module is in cache",
"if(__webpack_module_cache__[moduleId]) {",
Template.indent("return __webpack_module_cache__[moduleId].exports;"),
"}",
"// Create a new module (and put it into the cache)",
"var module = __webpack_module_cache__[moduleId] = {",
Template.indent([
needModuleId ? "id: moduleId," : "// no module.id needed",
needModuleLoaded ? "loaded: false," : "// no module.loaded needed",
"exports: {}"
]),
"};",
"",
outputOptions.strictModuleExceptionHandling
? Template.asString([
"// Execute the module function",
"var threw = true;",
"try {",
Template.indent([moduleExecution, "threw = false;"]),
"} finally {",
Template.indent([
"if(threw) delete __webpack_module_cache__[moduleId];"
]),
"}"
])
: Template.asString([
"// Execute the module function",
moduleExecution
]),
needModuleLoaded
? Template.asString([
"",
"// Flag the module as loaded",
"module.loaded = true;",
""
])
: "",
"// Return the exports of the module",
"return module.exports;"
]);
return tryRunOrWebpackError(
() => hooks.renderRequire.call(content, renderContext),
"JavascriptModulesPlugin.getCompilationHooks().renderRequire"
);
}
}
module.exports = JavascriptModulesPlugin;
module.exports.chunkHasJs = chunkHasJs;

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