ChunkPrefetchStartupRuntimeModule.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");

	/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */

	class ChunkPrefetchStartupRuntimeModule extends RuntimeModule {
	/**
	* @param {string} childType TODO
	* @param {string} runtimeFunction TODO
	* @param {(string\|number)[]} startupChunks chunk ids to trigger after startup
	*/
	constructor(childType, runtimeFunction, startupChunks) {
	super(`startup ${childType}`, RuntimeModule.STAGE_TRIGGER);
	this.childType = childType;
	this.runtimeFunction = runtimeFunction;
	this.startupChunks = startupChunks;
	}

	/**
	* @returns {string} runtime code
	*/
	generate() {
	const { runtimeFunction, startupChunks } = this;
	const { runtimeTemplate } = this.compilation;
	return Template.asString([
	`var startup = ${RuntimeGlobals.startup};`,
	`${RuntimeGlobals.startup} = ${runtimeTemplate.basicFunction("", [
	"var result = startup();",
	Template.asString(
	startupChunks.length < 3
	? startupChunks.map(
	c => `${runtimeFunction}(${JSON.stringify(c)});`
	)
	: `${JSON.stringify(startupChunks)}.map(${runtimeFunction});`
	),
	"return result;"
	])};`
	]);
	}
	}

	module.exports = ChunkPrefetchStartupRuntimeModule;