151 lines
4.3 KiB
JavaScript
151 lines
4.3 KiB
JavaScript
/*
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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 { SyncWaterfallHook } = require("tapable");
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const Compilation = require("../Compilation");
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const RuntimeGlobals = require("../RuntimeGlobals");
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const Template = require("../Template");
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const HelperRuntimeModule = require("./HelperRuntimeModule");
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compiler")} Compiler */
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/**
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* @typedef {Object} LoadScriptCompilationHooks
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* @property {SyncWaterfallHook<[string, Chunk]>} createScript
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*/
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/** @type {WeakMap<Compilation, LoadScriptCompilationHooks>} */
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const compilationHooksMap = new WeakMap();
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class LoadScriptRuntimeModule extends HelperRuntimeModule {
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/**
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* @param {Compilation} compilation the compilation
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* @returns {LoadScriptCompilationHooks} hooks
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*/
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static getCompilationHooks(compilation) {
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if (!(compilation instanceof Compilation)) {
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throw new TypeError(
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"The 'compilation' argument must be an instance of Compilation"
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);
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}
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let hooks = compilationHooksMap.get(compilation);
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if (hooks === undefined) {
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hooks = {
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createScript: new SyncWaterfallHook(["source", "chunk"])
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};
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compilationHooksMap.set(compilation, hooks);
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}
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return hooks;
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}
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constructor() {
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super("load script");
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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 { compilation } = this;
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const { runtimeTemplate, outputOptions } = compilation;
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const {
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scriptType,
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chunkLoadTimeout: loadTimeout,
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crossOriginLoading,
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uniqueName,
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charset
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} = outputOptions;
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const fn = RuntimeGlobals.loadScript;
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const { createScript } = LoadScriptRuntimeModule.getCompilationHooks(
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compilation
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);
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const code = Template.asString([
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"script = document.createElement('script');",
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scriptType ? `script.type = ${JSON.stringify(scriptType)};` : "",
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charset ? "script.charset = 'utf-8';" : "",
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`script.timeout = ${loadTimeout / 1000};`,
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`if (${RuntimeGlobals.scriptNonce}) {`,
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Template.indent(
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`script.setAttribute("nonce", ${RuntimeGlobals.scriptNonce});`
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),
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"}",
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uniqueName
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? 'script.setAttribute("data-webpack", dataWebpackPrefix + key);'
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: "",
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`script.src = url;`,
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crossOriginLoading
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? Template.asString([
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"if (script.src.indexOf(window.location.origin + '/') !== 0) {",
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Template.indent(
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`script.crossOrigin = ${JSON.stringify(crossOriginLoading)};`
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),
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"}"
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])
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: ""
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]);
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return Template.asString([
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"var inProgress = {};",
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uniqueName
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? `var dataWebpackPrefix = ${JSON.stringify(uniqueName + ":")};`
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: "// data-webpack is not used as build has no uniqueName",
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"// loadScript function to load a script via script tag",
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`${fn} = ${runtimeTemplate.basicFunction("url, done, key, chunkId", [
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"if(inProgress[url]) { inProgress[url].push(done); return; }",
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"var script, needAttach;",
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"if(key !== undefined) {",
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Template.indent([
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'var scripts = document.getElementsByTagName("script");',
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"for(var i = 0; i < scripts.length; i++) {",
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Template.indent([
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"var s = scripts[i];",
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`if(s.getAttribute("src") == url${
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uniqueName
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? ' || s.getAttribute("data-webpack") == dataWebpackPrefix + key'
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: ""
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}) { script = s; break; }`
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]),
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"}"
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]),
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"}",
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"if(!script) {",
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Template.indent([
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"needAttach = true;",
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createScript.call(code, this.chunk)
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]),
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"}",
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"inProgress[url] = [done];",
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"var onScriptComplete = " +
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runtimeTemplate.basicFunction(
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"prev, event",
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Template.asString([
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"// avoid mem leaks in IE.",
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"script.onerror = script.onload = null;",
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"clearTimeout(timeout);",
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"var doneFns = inProgress[url];",
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"delete inProgress[url];",
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"script.parentNode && script.parentNode.removeChild(script);",
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`doneFns && doneFns.forEach(${runtimeTemplate.returningFunction(
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"fn(event)",
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"fn"
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)});`,
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"if(prev) return prev(event);"
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])
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),
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";",
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`var timeout = setTimeout(onScriptComplete.bind(null, undefined, { type: 'timeout', target: script }), ${loadTimeout});`,
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"script.onerror = onScriptComplete.bind(null, script.onerror);",
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"script.onload = onScriptComplete.bind(null, script.onload);",
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"needAttach && document.head.appendChild(script);"
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])};`
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]);
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}
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}
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module.exports = LoadScriptRuntimeModule;
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