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

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

"use strict";

const makeSerializable = require("../util/makeSerializable");
const NullDependency = require("./NullDependency");

/** @typedef {import("../Dependency").ExportSpec} ExportSpec */
/** @typedef {import("../Dependency").ExportsSpec} ExportsSpec */
/** @typedef {import("../Dependency").UpdateHashContext} UpdateHashContext */
/** @typedef {import("../ModuleGraph")} ModuleGraph */
/** @typedef {import("../json/JsonData")} JsonData */
/** @typedef {import("../json/JsonData").JsonValue} JsonValue */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
/** @typedef {import("../util/Hash")} Hash */

/**
 * Defines the get exports from data fn callback.
 * @callback GetExportsFromDataFn
 * @param {JsonValue} data raw json data
 * @param {number=} curDepth current depth
 * @returns {ExportSpec[] | null} export spec or nothing
 */

/**
 * Gets exports with depth.
 * @param {number} exportsDepth exportsDepth
 * @returns {GetExportsFromDataFn} value
 */
const getExportsWithDepth = (exportsDepth) =>
        /** @type {GetExportsFromDataFn} */
        function getExportsFromData(data, curDepth = 1) {
                if (curDepth > exportsDepth) {
                        return null;
                }

                if (data && typeof data === "object") {
                        if (Array.isArray(data)) {
                                return data.length < 100
                                        ? data.map((item, idx) => ({
                                                        name: `${idx}`,
                                                        canMangle: true,
                                                        exports: getExportsFromData(item, curDepth + 1) || undefined
                                                }))
                                        : null;
                        }

                        /** @type {ExportSpec[]} */
                        const exports = [];

                        for (const key of Object.keys(data)) {
                                exports.push({
                                        name: key,
                                        canMangle: true,
                                        exports:
                                                getExportsFromData(
                                                        /** @type {JsonValue} */
                                                        (data[key]),
                                                        curDepth + 1
                                                ) || undefined
                                });
                        }

                        return exports;
                }

                return null;
        };

class JsonExportsDependency extends NullDependency {
        /**
         * Creates an instance of JsonExportsDependency.
         * @param {JsonData} data json data
         * @param {number} exportsDepth the depth of json exports to analyze
         */
        constructor(data, exportsDepth) {
                super();
                this.data = data;
                this.exportsDepth = exportsDepth;
        }

        get type() {
                return "json exports";
        }

        /**
         * Returns the exported names
         * @param {ModuleGraph} moduleGraph module graph
         * @returns {ExportsSpec | undefined} export names
         */
        getExports(moduleGraph) {
                return {
                        exports: getExportsWithDepth(this.exportsDepth)(
                                this.data && /** @type {JsonValue} */ (this.data.get())
                        ),
                        dependencies: undefined
                };
        }

        /**
         * Updates the hash with the data contributed by this instance.
         * @param {Hash} hash hash to be updated
         * @param {UpdateHashContext} context context
         * @returns {void}
         */
        updateHash(hash, context) {
                this.data.updateHash(hash);
        }

        /**
         * Serializes this instance into the provided serializer context.
         * @param {ObjectSerializerContext} context context
         */
        serialize(context) {
                const { write } = context;
                write(this.data);
                write(this.exportsDepth);
                super.serialize(context);
        }

        /**
         * Restores this instance from the provided deserializer context.
         * @param {ObjectDeserializerContext} context context
         */
        deserialize(context) {
                const { read } = context;
                this.data = read();
                this.exportsDepth = read();
                super.deserialize(context);
        }
}

makeSerializable(
        JsonExportsDependency,
        "webpack/lib/dependencies/JsonExportsDependency"
);

module.exports = JsonExportsDependency;