@v4fire/client/build/webpack/loaders/symbol-generator-loader.js

V4Fire client core library

'use strict';

/*!
 * V4Fire Client Core
 * https://github.com/V4Fire/Client
 *
 * Released under the MIT license
 * https://github.com/V4Fire/Client/blob/master/LICENSE
 */

const
	config = require('@config/config'),
	$C = require('collection.js');

const
	fs = require('fs'),
	isPathInside = require('is-path-inside');

const
	creationRgxp = /(\$\$ = symbolGenerator\()(\))/,
	symbolRgxp = /\$\$\.([a-z_$][\w$]*)/gi;

/**
 * Webpack loader to shim `core/symbol` module for old browsers
 *
 * @param {string} str
 * @returns {string}
 *
 * @example
 * ```js
 * import symbolGenerator from 'core/symbol';
 *
 * const $$ = symbolGenerator();
 *
 * console.log($$.foo);
 * console.log($$.bar);
 * ```
 */
module.exports = function symbolGeneratorLoader(str) {
	if (!/ES[35]$/.test(config.es())) {
		return str;
	}

	if (
		!$C(this.query.modules)
			.some((src) => isPathInside(fs.realpathSync(this.context), fs.realpathSync(src)))
	) {
		return str;
	}

	const
		names = new Set();

	let res;

	// eslint-disable-next-line no-cond-assign
	while (res = symbolRgxp.exec(str)) {
		names.add(res[1]);
	}

	if (names.size) {
		return str.replace(creationRgxp, (_, $1, $2) => $1 + JSON.stringify([...names]) + $2);
	}

	return str;
};

Object.assign(module.exports, {
	creationRgxp,
	symbolRgxp
});