webpack/lib/sharing/utils.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	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];
	}
};