source: trip-planner-front/node_modules/webpack/lib/sharing/utils.js@ 84d0fbb

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

"use strict";

const { join, dirname, readJson } = require("../util/fs");

/** @typedef {import("../util/fs").InputFileSystem} InputFileSystem */

/**
 * @param {string} str maybe required version
 * @returns {boolean} true, if it looks like a version
 */
exports.isRequiredVersion = str => {
        return /^([\d^=v<>~]|[*xX]$)/.test(str);
};

/**
 *
 * @param {InputFileSystem} fs file system
 * @param {string} directory directory to start looking into
 * @param {string[]} descriptionFiles possible description filenames
 * @param {function(Error=, {data: object, path: string}=): void} callback callback
 */
const getDescriptionFile = (fs, directory, descriptionFiles, callback) => {
        let i = 0;
        const tryLoadCurrent = () => {
                if (i >= descriptionFiles.length) {
                        const parentDirectory = dirname(fs, directory);
                        if (!parentDirectory || parentDirectory === directory) return callback();
                        return getDescriptionFile(
                                fs,
                                parentDirectory,
                                descriptionFiles,
                                callback
                        );
                }
                const filePath = join(fs, directory, descriptionFiles[i]);
                readJson(fs, filePath, (err, data) => {
                        if (err) {
                                if ("code" in err && err.code === "ENOENT") {
                                        i++;
                                        return tryLoadCurrent();
                                }
                                return callback(err);
                        }
                        if (!data || typeof data !== "object" || Array.isArray(data)) {
                                return callback(
                                        new Error(`Description file ${filePath} is not an object`)
                                );
                        }
                        callback(null, { data, path: filePath });
                });
        };
        tryLoadCurrent();
};
exports.getDescriptionFile = getDescriptionFile;

exports.getRequiredVersionFromDescriptionFile = (data, packageName) => {
        if (
                data.optionalDependencies &&
                typeof data.optionalDependencies === "object" &&
                packageName in data.optionalDependencies
        ) {
                return data.optionalDependencies[packageName];
        }
        if (
                data.dependencies &&
                typeof data.dependencies === "object" &&
                packageName in data.dependencies
        ) {
                return data.dependencies[packageName];
        }
        if (
                data.peerDependencies &&
                typeof data.peerDependencies === "object" &&
                packageName in data.peerDependencies
        ) {
                return data.peerDependencies[packageName];
        }
        if (
                data.devDependencies &&
                typeof data.devDependencies === "object" &&
                packageName in data.devDependencies
        ) {
                return data.devDependencies[packageName];
        }
};