source: trip-planner-front/node_modules/webpack/lib/library/ExportPropertyLibraryPlugin.js

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

"use strict";

const { ConcatSource } = require("webpack-sources");
const { UsageState } = require("../ExportsInfo");
const propertyAccess = require("../util/propertyAccess");
const { getEntryRuntime } = require("../util/runtime");
const AbstractLibraryPlugin = require("./AbstractLibraryPlugin");

/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../../declarations/WebpackOptions").LibraryOptions} LibraryOptions */
/** @typedef {import("../../declarations/WebpackOptions").LibraryType} LibraryType */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Module")} Module */
/** @typedef {import("../javascript/JavascriptModulesPlugin").StartupRenderContext} StartupRenderContext */
/** @template T @typedef {import("./AbstractLibraryPlugin").LibraryContext<T>} LibraryContext<T> */

/**
 * @typedef {Object} ExportPropertyLibraryPluginParsed
 * @property {string | string[]} export
 */

/**
 * @typedef {Object} ExportPropertyLibraryPluginOptions
 * @property {LibraryType} type
 * @property {boolean} nsObjectUsed the namespace object is used
 */
/**
 * @typedef {ExportPropertyLibraryPluginParsed} T
 * @extends {AbstractLibraryPlugin<ExportPropertyLibraryPluginParsed>}
 */
class ExportPropertyLibraryPlugin extends AbstractLibraryPlugin {
        /**
         * @param {ExportPropertyLibraryPluginOptions} options options
         */
        constructor({ type, nsObjectUsed }) {
                super({
                        pluginName: "ExportPropertyLibraryPlugin",
                        type
                });
                this.nsObjectUsed = nsObjectUsed;
        }

        /**
         * @param {LibraryOptions} library normalized library option
         * @returns {T | false} preprocess as needed by overriding
         */
        parseOptions(library) {
                return {
                        export: library.export
                };
        }

        /**
         * @param {Module} module the exporting entry module
         * @param {string} entryName the name of the entrypoint
         * @param {LibraryContext<T>} libraryContext context
         * @returns {void}
         */
        finishEntryModule(
                module,
                entryName,
                { options, compilation, compilation: { moduleGraph } }
        ) {
                const runtime = getEntryRuntime(compilation, entryName);
                if (options.export) {
                        const exportsInfo = moduleGraph.getExportInfo(
                                module,
                                Array.isArray(options.export) ? options.export[0] : options.export
                        );
                        exportsInfo.setUsed(UsageState.Used, runtime);
                        exportsInfo.canMangleUse = false;
                } else {
                        const exportsInfo = moduleGraph.getExportsInfo(module);
                        if (this.nsObjectUsed) {
                                exportsInfo.setUsedInUnknownWay(runtime);
                        } else {
                                exportsInfo.setAllKnownExportsUsed(runtime);
                        }
                }
                moduleGraph.addExtraReason(module, "used as library export");
        }

        /**
         * @param {Chunk} chunk the chunk
         * @param {Set<string>} set runtime requirements
         * @param {LibraryContext<T>} libraryContext context
         * @returns {void}
         */
        runtimeRequirements(chunk, set, libraryContext) {}

        /**
         * @param {Source} source source
         * @param {Module} module module
         * @param {StartupRenderContext} renderContext render context
         * @param {LibraryContext<T>} libraryContext context
         * @returns {Source} source with library export
         */
        renderStartup(source, module, renderContext, { options }) {
                if (!options.export) return source;
                const postfix = `__webpack_exports__ = __webpack_exports__${propertyAccess(
                        Array.isArray(options.export) ? options.export : [options.export]
                )};\n`;
                return new ConcatSource(source, postfix);
        }
}

module.exports = ExportPropertyLibraryPlugin;