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