webpack/lib/rules/BasicMatcherRulePlugin.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 Tobias Koppers @sokra
*/

"use strict";

/** @typedef {import("./RuleSetCompiler")} RuleSetCompiler */
/** @typedef {import("./RuleSetCompiler").RuleCondition} RuleCondition */

class BasicMatcherRulePlugin {
	/**
	 * @param {string} ruleProperty the rule property
	 * @param {string=} dataProperty the data property
	 * @param {boolean=} invert if true, inverts the condition
	 */
	constructor(ruleProperty, dataProperty, invert) {
		this.ruleProperty = ruleProperty;
		this.dataProperty = dataProperty || ruleProperty;
		this.invert = invert || false;
	}

	/**
	 * @param {RuleSetCompiler} ruleSetCompiler the rule set compiler
	 * @returns {void}
	 */
	apply(ruleSetCompiler) {
		ruleSetCompiler.hooks.rule.tap(
			"BasicMatcherRulePlugin",
			(path, rule, unhandledProperties, result) => {
				if (unhandledProperties.has(this.ruleProperty)) {
					unhandledProperties.delete(this.ruleProperty);
					const value = rule[this.ruleProperty];
					const condition = ruleSetCompiler.compileCondition(
						`${path}.${this.ruleProperty}`,
						value
					);
					const fn = condition.fn;
					result.conditions.push({
						property: this.dataProperty,
						matchWhenEmpty: this.invert
							? !condition.matchWhenEmpty
							: condition.matchWhenEmpty,
						fn: this.invert ? v => !fn(v) : fn
					});
				}
			}
		);
	}
}

module.exports = BasicMatcherRulePlugin;