source: frontend/node_modules/webpack/lib/prefetch/ChunkPrefetchFunctionRuntimeModule.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
*/

"use strict";

const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");

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

class ChunkPrefetchFunctionRuntimeModule extends RuntimeModule {
        /**
         * @param {"prefetch" | "preload"} type "prefetch" or "preload" chunk type function
         * @param {string} runtimeFunction the runtime function name
         * @param {string} runtimeHandlers the runtime handlers
         */
        constructor(type, runtimeFunction, runtimeHandlers) {
                super(`chunk ${type} function`);
                /** @type {string} */
                this.runtimeFunction = runtimeFunction;
                /** @type {string} */
                this.runtimeHandlers = runtimeHandlers;
        }

        /**
         * Generates runtime code for this runtime module.
         * @returns {string | null} runtime code
         */
        generate() {
                const { runtimeFunction, runtimeHandlers } = this;
                const compilation = /** @type {Compilation} */ (this.compilation);
                const { runtimeTemplate } = compilation;
                return Template.asString([
                        `${runtimeHandlers} = {};`,
                        `${runtimeFunction} = ${runtimeTemplate.basicFunction("chunkId", [
                                // map is shorter than forEach
                                `Object.keys(${runtimeHandlers}).map(${runtimeTemplate.basicFunction(
                                        "key",
                                        `${runtimeHandlers}[key](chunkId);`
                                )});`
                        ])}`
                ]);
        }
}

module.exports = ChunkPrefetchFunctionRuntimeModule;