source: frontend/node_modules/webpack/lib/dependencies/processExportInfo.js

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

"use strict";

const { UsageState } = require("../ExportsInfo");

/** @typedef {import("../Dependency").RawReferencedExports} RawReferencedExports */
/** @typedef {import("../ExportsInfo").ExportInfo} ExportInfo */
/** @typedef {import("../util/runtime").RuntimeSpec} RuntimeSpec */

/**
 * Process export info.
 * @param {RuntimeSpec} runtime the runtime
 * @param {RawReferencedExports} referencedExports list of referenced exports, will be added to
 * @param {string[]} prefix export prefix
 * @param {ExportInfo=} exportInfo the export info
 * @param {boolean} defaultPointsToSelf when true, using default will reference itself
 * @param {Set<ExportInfo>} alreadyVisited already visited export info (to handle circular reexports)
 */
const processExportInfo = (
        runtime,
        referencedExports,
        prefix,
        exportInfo,
        defaultPointsToSelf = false,
        alreadyVisited = new Set()
) => {
        if (!exportInfo) {
                referencedExports.push(prefix);
                return;
        }
        const used = exportInfo.getUsed(runtime);
        if (used === UsageState.Unused) return;
        if (alreadyVisited.has(exportInfo)) {
                referencedExports.push(prefix);
                return;
        }
        alreadyVisited.add(exportInfo);
        if (
                used !== UsageState.OnlyPropertiesUsed ||
                !exportInfo.exportsInfo ||
                exportInfo.exportsInfo.otherExportsInfo.getUsed(runtime) !==
                        UsageState.Unused
        ) {
                alreadyVisited.delete(exportInfo);
                referencedExports.push(prefix);
                return;
        }
        const exportsInfo = exportInfo.exportsInfo;
        for (const exportInfo of exportsInfo.orderedExports) {
                processExportInfo(
                        runtime,
                        referencedExports,
                        defaultPointsToSelf && exportInfo.name === "default"
                                ? prefix
                                : [...prefix, exportInfo.name],
                        exportInfo,
                        false,
                        alreadyVisited
                );
        }
        alreadyVisited.delete(exportInfo);
};

module.exports = processExportInfo;