mirror of https://github.com/webpack/webpack.git
97 lines
3.0 KiB
JavaScript
97 lines
3.0 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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class ReadFileChunkLoadingRuntimeModule extends RuntimeModule {
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constructor(chunk) {
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super("readFile chunk loading", 10);
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this.chunk = chunk;
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}
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/**
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* @returns {string} runtime code
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*/
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generate() {
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const { chunk } = this;
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const fn = RuntimeGlobals.ensureChunkHandlers;
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return Template.asString([
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"// object to store loaded chunks",
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'// "0" means "already loaded", Promise means loading',
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"var installedChunks = {",
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Template.indent(
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chunk.ids.map(id => `${JSON.stringify(id)}: 0`).join(",\n")
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),
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"};",
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"",
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"// ReadFile + VM.run chunk loading for javascript",
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`${fn}.push(function(chunkId, promises) {`,
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Template.indent([
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"",
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"var installedChunkData = installedChunks[chunkId];",
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'if(installedChunkData !== 0) { // 0 means "already installed".',
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Template.indent([
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'// array of [resolve, reject, promise] means "currently loading"',
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"if(installedChunkData) {",
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Template.indent(["promises.push(installedChunkData[2]);"]),
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"} else {",
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Template.indent([
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"// load the chunk and return promise to it",
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"var promise = new Promise(function(resolve, reject) {",
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Template.indent([
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"installedChunkData = installedChunks[chunkId] = [resolve, reject];",
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`var filename = require('path').join(__dirname, ${
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RuntimeGlobals.getChunkScriptFilename
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}(chunkId));`,
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"require('fs').readFile(filename, 'utf-8', function(err, content) {",
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Template.indent([
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"if(err) return reject(err);",
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"var chunk = {};",
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"require('vm').runInThisContext('(function(exports, require, __dirname, __filename) {' + content + '\\n})', filename)" +
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"(chunk, require, require('path').dirname(filename), filename);",
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"var moreModules = chunk.modules, chunkIds = chunk.ids;",
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"for(var moduleId in moreModules) {",
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Template.indent([
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"if(Object.prototype.hasOwnProperty.call(moreModules, moduleId)) {",
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Template.indent([
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`${
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RuntimeGlobals.moduleFactories
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}[moduleId] = moreModules[moduleId];`
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]),
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"}"
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]),
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"}",
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"var callbacks = [];",
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"for(var i = 0; i < chunkIds.length; i++) {",
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Template.indent([
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"if(installedChunks[chunkIds[i]])",
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Template.indent([
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"callbacks = callbacks.concat(installedChunks[chunkIds[i]][0]);"
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]),
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"installedChunks[chunkIds[i]] = 0;"
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]),
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"}",
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"for(i = 0; i < callbacks.length; i++)",
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Template.indent("callbacks[i]();")
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]),
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"});"
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]),
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"});",
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"promises.push(installedChunkData[2] = promise);"
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]),
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"}"
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]),
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"}"
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]),
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"})"
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]);
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}
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}
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module.exports = ReadFileChunkLoadingRuntimeModule;
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