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ReadFileChunkLoadingRuntimeModule.js
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Mon, Feb 10, 10:16

ReadFileChunkLoadingRuntimeModule.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
*/
"use strict";
const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");
const {
chunkHasJs,
getChunkFilenameTemplate
} = require("../javascript/JavascriptModulesPlugin");
const compileBooleanMatcher = require("../util/compileBooleanMatcher");
const { getUndoPath } = require("../util/identifier");
class ReadFileChunkLoadingRuntimeModule extends RuntimeModule {
constructor(runtimeRequirements) {
super("readFile chunk loading", RuntimeModule.STAGE_ATTACH);
this.runtimeRequirements = runtimeRequirements;
}
/**
* @returns {string} runtime code
*/
generate() {
const { chunk } = this;
const { chunkGraph, runtimeTemplate } = this.compilation;
const fn = RuntimeGlobals.ensureChunkHandlers;
const withBaseURI = this.runtimeRequirements.has(RuntimeGlobals.baseURI);
const withExternalInstallChunk = this.runtimeRequirements.has(
RuntimeGlobals.externalInstallChunk
);
const withLoading = this.runtimeRequirements.has(
RuntimeGlobals.ensureChunkHandlers
);
const withHmr = this.runtimeRequirements.has(
RuntimeGlobals.hmrDownloadUpdateHandlers
);
const withHmrManifest = this.runtimeRequirements.has(
RuntimeGlobals.hmrDownloadManifest
);
const hasJsMatcher = compileBooleanMatcher(
chunkGraph.getChunkConditionMap(chunk, chunkHasJs)
);
const outputName = this.compilation.getPath(
getChunkFilenameTemplate(chunk, this.compilation.outputOptions),
{
chunk,
contentHashType: "javascript"
}
);
const rootOutputDir = getUndoPath(outputName, false);
return Template.asString([
withBaseURI
? Template.asString([
`${RuntimeGlobals.baseURI} = require("url").pathToFileURL(${
rootOutputDir
? `__dirname + ${JSON.stringify("/" + rootOutputDir)}`
: "__filename"
});`
])
: "// no baseURI",
"",
"// object to store loaded chunks",
'// "0" means "already loaded", Promise means loading',
"var installedChunks = {",
Template.indent(
chunk.ids.map(id => `${JSON.stringify(id)}: 0`).join(",\n")
),
"};",
"",
withLoading || withExternalInstallChunk
? `var installChunk = ${runtimeTemplate.basicFunction("chunk", [
"var moreModules = chunk.modules, chunkIds = chunk.ids, runtime = chunk.runtime;",
"for(var moduleId in moreModules) {",
Template.indent([
`if(${RuntimeGlobals.hasOwnProperty}(moreModules, moduleId)) {`,
Template.indent([
`${RuntimeGlobals.moduleFactories}[moduleId] = moreModules[moduleId];`
]),
"}"
]),
"}",
`if(runtime) runtime(__webpack_require__);`,
"var callbacks = [];",
"for(var i = 0; i < chunkIds.length; i++) {",
Template.indent([
"if(installedChunks[chunkIds[i]])",
Template.indent([
"callbacks = callbacks.concat(installedChunks[chunkIds[i]][0]);"
]),
"installedChunks[chunkIds[i]] = 0;"
]),
"}",
"for(i = 0; i < callbacks.length; i++)",
Template.indent("callbacks[i]();")
])};`
: "// no chunk install function needed",
"",
withLoading
? Template.asString([
"// ReadFile + VM.run chunk loading for javascript",
`${fn}.readFileVm = function(chunkId, promises) {`,
hasJsMatcher !== false
? Template.indent([
"",
"var installedChunkData = installedChunks[chunkId];",
'if(installedChunkData !== 0) { // 0 means "already installed".',
Template.indent([
'// array of [resolve, reject, promise] means "currently loading"',
"if(installedChunkData) {",
Template.indent(["promises.push(installedChunkData[2]);"]),
"} else {",
Template.indent([
hasJsMatcher === true
? "if(true) { // all chunks have JS"
: `if(${hasJsMatcher("chunkId")}) {`,
Template.indent([
"// load the chunk and return promise to it",
"var promise = new Promise(function(resolve, reject) {",
Template.indent([
"installedChunkData = installedChunks[chunkId] = [resolve, reject];",
`var filename = require('path').join(__dirname, ${JSON.stringify(
rootOutputDir
)} + ${
RuntimeGlobals.getChunkScriptFilename
}(chunkId));`,
"require('fs').readFile(filename, 'utf-8', function(err, content) {",
Template.indent([
"if(err) return reject(err);",
"var chunk = {};",
"require('vm').runInThisContext('(function(exports, require, __dirname, __filename) {' + content + '\\n})', filename)" +
"(chunk, require, require('path').dirname(filename), filename);",
"installChunk(chunk);"
]),
"});"
]),
"});",
"promises.push(installedChunkData[2] = promise);"
]),
"} else installedChunks[chunkId] = 0;"
]),
"}"
]),
"}"
])
: Template.indent(["installedChunks[chunkId] = 0;"]),
"};"
])
: "// no chunk loading",
"",
withExternalInstallChunk
? Template.asString([
"module.exports = __webpack_require__;",
`${RuntimeGlobals.externalInstallChunk} = installChunk;`
])
: "// no external install chunk",
"",
withHmr
? Template.asString([
"function loadUpdateChunk(chunkId, updatedModulesList) {",
Template.indent([
"return new Promise(function(resolve, reject) {",
Template.indent([
`var filename = require('path').join(__dirname, ${JSON.stringify(
rootOutputDir
)} + ${RuntimeGlobals.getChunkUpdateScriptFilename}(chunkId));`,
"require('fs').readFile(filename, 'utf-8', function(err, content) {",
Template.indent([
"if(err) return reject(err);",
"var update = {};",
"require('vm').runInThisContext('(function(exports, require, __dirname, __filename) {' + content + '\\n})', filename)" +
"(update, require, require('path').dirname(filename), filename);",
"var updatedModules = update.modules;",
"var runtime = update.runtime;",
"for(var moduleId in updatedModules) {",
Template.indent([
`if(${RuntimeGlobals.hasOwnProperty}(updatedModules, moduleId)) {`,
Template.indent([
`currentUpdate[moduleId] = updatedModules[moduleId];`,
"if(updatedModulesList) updatedModulesList.push(moduleId);"
]),
"}"
]),
"}",
"if(runtime) currentUpdateRuntime.push(runtime);",
"resolve();"
]),
"});"
]),
"});"
]),
"}",
"",
Template.getFunctionContent(
require("../hmr/JavascriptHotModuleReplacement.runtime.js")
)
.replace(/\$key\$/g, "readFileVm")
.replace(/\$installedChunks\$/g, "installedChunks")
.replace(/\$loadUpdateChunk\$/g, "loadUpdateChunk")
.replace(/\$moduleCache\$/g, RuntimeGlobals.moduleCache)
.replace(/\$moduleFactories\$/g, RuntimeGlobals.moduleFactories)
.replace(
/\$ensureChunkHandlers\$/g,
RuntimeGlobals.ensureChunkHandlers
)
.replace(/\$hasOwnProperty\$/g, RuntimeGlobals.hasOwnProperty)
.replace(/\$hmrModuleData\$/g, RuntimeGlobals.hmrModuleData)
.replace(
/\$hmrDownloadUpdateHandlers\$/g,
RuntimeGlobals.hmrDownloadUpdateHandlers
)
.replace(
/\$hmrInvalidateModuleHandlers\$/g,
RuntimeGlobals.hmrInvalidateModuleHandlers
)
])
: "// no HMR",
"",
withHmrManifest
? Template.asString([
`${RuntimeGlobals.hmrDownloadManifest} = function() {`,
Template.indent([
"return new Promise(function(resolve, reject) {",
Template.indent([
`var filename = require('path').join(__dirname, ${JSON.stringify(
rootOutputDir
)} + ${RuntimeGlobals.getUpdateManifestFilename}());`,
"require('fs').readFile(filename, 'utf-8', function(err, content) {",
Template.indent([
"if(err) {",
Template.indent([
'if(err.code === "ENOENT") return resolve();',
"return reject(err);"
]),
"}",
"try { resolve(JSON.parse(content)); }",
"catch(e) { reject(e); }"
]),
"});"
]),
"});"
]),
"}"
])
: "// no HMR manifest"
]);
}
}
module.exports = ReadFileChunkLoadingRuntimeModule;

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