source: trip-planner-front/node_modules/webpack/lib/javascript/StartupHelpers.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/

"use strict";

const Entrypoint = require("../Entrypoint");
const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const { isSubset } = require("../util/SetHelpers");
const { chunkHasJs } = require("./JavascriptModulesPlugin");

/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../ChunkGroup")} ChunkGroup */
/** @typedef {import("../RuntimeTemplate")} RuntimeTemplate */
/** @typedef {(string|number)[]} EntryItem */

// TODO move to this file to ../javascript/ChunkHelpers.js

/**
 * @param {Entrypoint} entrypoint a chunk group
 * @param {Chunk} excludedChunk1 current chunk which is excluded
 * @param {Chunk} excludedChunk2 runtime chunk which is excluded
 * @returns {Set<Chunk>} chunks
 */
const getAllChunks = (entrypoint, excludedChunk1, excludedChunk2) => {
        const queue = new Set([entrypoint]);
        const chunks = new Set();
        for (const entrypoint of queue) {
                for (const chunk of entrypoint.chunks) {
                        if (chunk === excludedChunk1) continue;
                        if (chunk === excludedChunk2) continue;
                        chunks.add(chunk);
                }
                for (const parent of entrypoint.parentsIterable) {
                        if (parent instanceof Entrypoint) queue.add(parent);
                }
        }
        return chunks;
};

const EXPORT_PREFIX = "var __webpack_exports__ = ";

/**
 * @param {ChunkGraph} chunkGraph chunkGraph
 * @param {RuntimeTemplate} runtimeTemplate runtimeTemplate
 * @param {import("../ChunkGraph").EntryModuleWithChunkGroup[]} entries entries
 * @param {Chunk} chunk chunk
 * @param {boolean} passive true: passive startup with on chunks loaded
 * @returns {string} runtime code
 */
exports.generateEntryStartup = (
        chunkGraph,
        runtimeTemplate,
        entries,
        chunk,
        passive
) => {
        /** @type {string[]} */
        const runtime = [
                `var __webpack_exec__ = ${runtimeTemplate.returningFunction(
                        `__webpack_require__(${RuntimeGlobals.entryModuleId} = moduleId)`,
                        "moduleId"
                )}`
        ];

        const runModule = id => {
                return `__webpack_exec__(${JSON.stringify(id)})`;
        };
        const outputCombination = (chunks, moduleIds, final) => {
                if (chunks.size === 0) {
                        runtime.push(
                                `${final ? EXPORT_PREFIX : ""}(${moduleIds.map(runModule).join(", ")});`
                        );
                } else {
                        const fn = runtimeTemplate.returningFunction(
                                moduleIds.map(runModule).join(", ")
                        );
                        runtime.push(
                                `${final && !passive ? EXPORT_PREFIX : ""}${
                                        passive
                                                ? RuntimeGlobals.onChunksLoaded
                                                : RuntimeGlobals.startupEntrypoint
                                }(0, ${JSON.stringify(Array.from(chunks, c => c.id))}, ${fn});`
                        );
                        if (final && passive) {
                                runtime.push(`${EXPORT_PREFIX}${RuntimeGlobals.onChunksLoaded}();`);
                        }
                }
        };

        let currentChunks = undefined;
        let currentModuleIds = undefined;

        for (const [module, entrypoint] of entries) {
                const runtimeChunk = entrypoint.getRuntimeChunk();
                const moduleId = chunkGraph.getModuleId(module);
                const chunks = getAllChunks(entrypoint, chunk, runtimeChunk);
                if (
                        currentChunks &&
                        currentChunks.size === chunks.size &&
                        isSubset(currentChunks, chunks)
                ) {
                        currentModuleIds.push(moduleId);
                } else {
                        if (currentChunks) {
                                outputCombination(currentChunks, currentModuleIds);
                        }
                        currentChunks = chunks;
                        currentModuleIds = [moduleId];
                }
        }

        // output current modules with export prefix
        if (currentChunks) {
                outputCombination(currentChunks, currentModuleIds, true);
        }
        runtime.push("");
        return Template.asString(runtime);
};

/**
 * @param {Hash} hash the hash to update
 * @param {ChunkGraph} chunkGraph chunkGraph
 * @param {import("../ChunkGraph").EntryModuleWithChunkGroup[]} entries entries
 * @param {Chunk} chunk chunk
 * @returns {void}
 */
exports.updateHashForEntryStartup = (hash, chunkGraph, entries, chunk) => {
        for (const [module, entrypoint] of entries) {
                const runtimeChunk = entrypoint.getRuntimeChunk();
                const moduleId = chunkGraph.getModuleId(module);
                hash.update(`${moduleId}`);
                for (const c of getAllChunks(entrypoint, chunk, runtimeChunk))
                        hash.update(`${c.id}`);
        }
};

/**
 * @param {Chunk} chunk the chunk
 * @param {ChunkGraph} chunkGraph the chunk graph
 * @returns {Set<number | string>} initially fulfilled chunk ids
 */
exports.getInitialChunkIds = (chunk, chunkGraph) => {
        const initialChunkIds = new Set(chunk.ids);
        for (const c of chunk.getAllInitialChunks()) {
                if (c === chunk || chunkHasJs(c, chunkGraph)) continue;
                for (const id of c.ids) initialChunkIds.add(id);
        }
        return initialChunkIds;
};