webpack/lib/errors/MixedExportsWarning.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports 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 Alexander Akait @alexander-akait
*/

"use strict";

const WebpackError = require("./WebpackError");

/**
 * @typedef {object} MixedExportsDetails
 * @property {string} name the entry, by name
 * @property {string[]} named the named exports sitting beside the default
 */

class MixedExportsWarning extends WebpackError {
	/**
	 * Creates an instance of MixedExportsWarning.
	 * @param {MixedExportsDetails[]} entries the entries that mix them
	 * @param {string} type the library type they are built for
	 */
	constructor(entries, type) {
		const list = entries
			.map(
				(entry) =>
					`\n  ${entry.name} (default and ${entry.named.length}: ${entry.named
						.slice(0, 3)
						.join(", ")}${entry.named.length > 3 ? ", …" : ""})`
			)
			.join("");

		super(
			`mixed exports: ${entries.length} ${entries.length === 1 ? "entry exports" : "entries export"} a default beside named exports for the '${type}' library:${list}\nA consumer calling 'require()' gets the namespace object, so the default arrives as '.default' rather than as the value itself. Exporting only a default, or only named exports, leaves no ambiguity — 'output.library.export' can also pick one.\nFor more info visit https://webpack.js.org/configuration/output/#outputlibraryexport`
		);

		/** @type {string} */
		this.name = "MixedExportsWarning";
	}
}

module.exports = MixedExportsWarning;