source: frontend/node_modules/webpack/lib/runtime/OnChunksLoadedRuntimeModule.js

/*
        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("../Compilation")} Compilation */

class OnChunksLoadedRuntimeModule extends RuntimeModule {
        constructor() {
                super("chunk loaded");
        }

        /**
         * Generates runtime code for this runtime module.
         * @returns {string | null} runtime code
         */
        generate() {
                const compilation = /** @type {Compilation} */ (this.compilation);
                const { runtimeTemplate } = compilation;
                return Template.asString([
                        "var deferred = [];",
                        `${RuntimeGlobals.onChunksLoaded} = ${runtimeTemplate.basicFunction(
                                "result, chunkIds, fn, priority",
                                [
                                        "if(chunkIds) {",
                                        Template.indent([
                                                "priority = priority || 0;",
                                                "for(var i = deferred.length; i > 0 && deferred[i - 1][2] > priority; i--) deferred[i] = deferred[i - 1];",
                                                "deferred[i] = [chunkIds, fn, priority];",
                                                "return;"
                                        ]),
                                        "}",
                                        "var notFulfilled = Infinity;",
                                        "for (var i = 0; i < deferred.length; i++) {",
                                        Template.indent([
                                                runtimeTemplate.destructureArray(
                                                        ["chunkIds", "fn", "priority"],
                                                        "deferred[i]"
                                                ),
                                                "var fulfilled = true;",
                                                "for (var j = 0; j < chunkIds.length; j++) {",
                                                Template.indent([
                                                        `if ((priority & 1 === 0 || notFulfilled >= priority) && Object.keys(${
                                                                RuntimeGlobals.onChunksLoaded
                                                        }).every(${runtimeTemplate.returningFunction(
                                                                `${RuntimeGlobals.onChunksLoaded}[key](chunkIds[j])`,
                                                                "key"
                                                        )})) {`,
                                                        Template.indent(["chunkIds.splice(j--, 1);"]),
                                                        "} else {",
                                                        Template.indent([
                                                                "fulfilled = false;",
                                                                "if(priority < notFulfilled) notFulfilled = priority;"
                                                        ]),
                                                        "}"
                                                ]),
                                                "}",
                                                "if(fulfilled) {",
                                                Template.indent([
                                                        "deferred.splice(i--, 1)",
                                                        "var r = fn();",
                                                        "if (r !== undefined) result = r;"
                                                ]),
                                                "}"
                                        ]),
                                        "}",
                                        "return result;"
                                ]
                        )};`
                ]);
        }
}

module.exports = OnChunksLoadedRuntimeModule;