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ModuleChunkFormatPlugin.js
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Created
Tue, Jun 17, 14:38

ModuleChunkFormatPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { ConcatSource } = require("webpack-sources");
const { RuntimeGlobals } = require("..");
const HotUpdateChunk = require("../HotUpdateChunk");
const Template = require("../Template");
const { getAllChunks } = require("../javascript/ChunkHelpers");
const {
getCompilationHooks,
getChunkFilenameTemplate
} = require("../javascript/JavascriptModulesPlugin");
const { updateHashForEntryStartup } = require("../javascript/StartupHelpers");
/** @typedef {import("../Compiler")} Compiler */
class ModuleChunkFormatPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.thisCompilation.tap(
"ModuleChunkFormatPlugin",
compilation => {
compilation.hooks.additionalChunkRuntimeRequirements.tap(
"ModuleChunkFormatPlugin",
(chunk, set) => {
if (chunk.hasRuntime()) return;
if (compilation.chunkGraph.getNumberOfEntryModules(chunk) > 0) {
set.add(RuntimeGlobals.require);
set.add(RuntimeGlobals.startupEntrypoint);
set.add(RuntimeGlobals.externalInstallChunk);
}
}
);
const hooks = getCompilationHooks(compilation);
hooks.renderChunk.tap(
"ModuleChunkFormatPlugin",
(modules, renderContext) => {
const { chunk, chunkGraph, runtimeTemplate } = renderContext;
const hotUpdateChunk =
chunk instanceof HotUpdateChunk ? chunk : null;
const source = new ConcatSource();
if (hotUpdateChunk) {
throw new Error(
"HMR is not implemented for module chunk format yet"
);
} else {
source.add(`export const id = ${JSON.stringify(chunk.id)};\n`);
source.add(`export const ids = ${JSON.stringify(chunk.ids)};\n`);
source.add(`export const modules = `);
source.add(modules);
source.add(`;\n`);
const runtimeModules =
chunkGraph.getChunkRuntimeModulesInOrder(chunk);
if (runtimeModules.length > 0) {
source.add("export const runtime =\n");
source.add(
Template.renderChunkRuntimeModules(
runtimeModules,
renderContext
)
);
}
const entries = Array.from(
chunkGraph.getChunkEntryModulesWithChunkGroupIterable(chunk)
);
if (entries.length > 0) {
const runtimeChunk = entries[0][1].getRuntimeChunk();
const currentOutputName = compilation
.getPath(
getChunkFilenameTemplate(chunk, compilation.outputOptions),
{
chunk,
contentHashType: "javascript"
}
)
.split("/");
// remove filename, we only need the directory
currentOutputName.pop();
const getRelativePath = chunk => {
const baseOutputName = currentOutputName.slice();
const chunkOutputName = compilation
.getPath(
getChunkFilenameTemplate(
chunk,
compilation.outputOptions
),
{
chunk: chunk,
contentHashType: "javascript"
}
)
.split("/");
// remove common parts
while (
baseOutputName.length > 0 &&
chunkOutputName.length > 0 &&
baseOutputName[0] === chunkOutputName[0]
) {
baseOutputName.shift();
chunkOutputName.shift();
}
// create final path
return (
(baseOutputName.length > 0
? "../".repeat(baseOutputName.length)
: "./") + chunkOutputName.join("/")
);
};
const entrySource = new ConcatSource();
entrySource.add(source);
entrySource.add(";\n\n// load runtime\n");
entrySource.add(
`import __webpack_require__ from ${JSON.stringify(
getRelativePath(runtimeChunk)
)};\n`
);
const startupSource = new ConcatSource();
startupSource.add(
`var __webpack_exec__ = ${runtimeTemplate.returningFunction(
`__webpack_require__(${RuntimeGlobals.entryModuleId} = moduleId)`,
"moduleId"
)}\n`
);
const loadedChunks = new Set();
let index = 0;
for (let i = 0; i < entries.length; i++) {
const [module, entrypoint] = entries[i];
const final = i + 1 === entries.length;
const moduleId = chunkGraph.getModuleId(module);
const chunks = getAllChunks(
entrypoint,
runtimeChunk,
undefined
);
for (const chunk of chunks) {
if (loadedChunks.has(chunk)) continue;
loadedChunks.add(chunk);
startupSource.add(
`import * as __webpack_chunk_${index}__ from ${JSON.stringify(
getRelativePath(chunk)
)};\n`
);
startupSource.add(
`${RuntimeGlobals.externalInstallChunk}(__webpack_chunk_${index}__);\n`
);
index++;
}
startupSource.add(
`${
final ? "var __webpack_exports__ = " : ""
}__webpack_exec__(${JSON.stringify(moduleId)});\n`
);
}
entrySource.add(
hooks.renderStartup.call(
startupSource,
entries[entries.length - 1][0],
{
...renderContext,
inlined: false
}
)
);
return entrySource;
}
}
return source;
}
);
hooks.chunkHash.tap(
"ModuleChunkFormatPlugin",
(chunk, hash, { chunkGraph, runtimeTemplate }) => {
if (chunk.hasRuntime()) return;
hash.update("ModuleChunkFormatPlugin");
hash.update("1");
const entries = Array.from(
chunkGraph.getChunkEntryModulesWithChunkGroupIterable(chunk)
);
updateHashForEntryStartup(hash, chunkGraph, entries, chunk);
}
);
}
);
}
}
module.exports = ModuleChunkFormatPlugin;

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