source: frontend/node_modules/webpack/lib/javascript/ChunkFormatHelpers.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Natsu @xiaoxiaojx
*/

"use strict";

const { updateHashForEntryStartup } = require("./StartupHelpers");

/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Entrypoint")} Entrypoint */
/** @typedef {import("../util/Hash")} Hash */
/** @typedef {import("../Compilation").ChunkHashContext} ChunkHashContext */

/**
 * Returns } Object containing chunk entries and runtime chunk.
 * @param {Chunk} chunk The chunk to get information for
 * @param {ChunkGraph} chunkGraph The chunk graph containing the chunk
 * @returns {{ entries: [Module, Entrypoint | undefined][], runtimeChunk: Chunk | null }} Object containing chunk entries and runtime chunk
 */
function getChunkInfo(chunk, chunkGraph) {
        const entries = [
                ...chunkGraph.getChunkEntryModulesWithChunkGroupIterable(chunk)
        ];
        const runtimeChunk =
                entries.length > 0
                        ? /** @type {Entrypoint[][]} */
                                (entries)[0][1].getRuntimeChunk()
                        : null;

        return {
                entries,
                runtimeChunk
        };
}

/**
 * Creates a chunk hash handler
 * @param {string} name The name of the chunk
 * @returns {(chunk: Chunk, hash: Hash, { chunkGraph }: ChunkHashContext) => void} The chunk hash handler
 */
function createChunkHashHandler(name) {
        /**
         * Processes the provided chunk.
         * @param {Chunk} chunk The chunk to get information for
         * @param {Hash} hash The hash to update
         * @param {ChunkHashContext} chunkHashContext The chunk hash context
         * @returns {void}
         */
        return (chunk, hash, { chunkGraph }) => {
                if (chunk.hasRuntime()) return;
                const { entries, runtimeChunk } = getChunkInfo(chunk, chunkGraph);
                hash.update(name);
                hash.update("1");
                if (runtimeChunk && runtimeChunk.hash) {
                        // https://github.com/webpack/webpack/issues/19439
                        // Any change to runtimeChunk should trigger a hash update,
                        // we shouldn't depend on or inspect its internal implementation.
                        // import __webpack_require__ from "./runtime-main.e9400aee33633a3973bd.js";
                        hash.update(runtimeChunk.hash);
                }
                updateHashForEntryStartup(hash, chunkGraph, entries, chunk);
        };
}

module.exports = {
        createChunkHashHandler,
        getChunkInfo
};