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("../../declarations/WebpackOptions").RuleSetConditionOrConditions} RuleSetConditionOrConditions */
/** @typedef {import("../../declarations/WebpackOptions").RuleSetConditionOrConditionsAbsolute} RuleSetConditionOrConditionsAbsolute */
/** @typedef {import("../../declarations/WebpackOptions").RuleSetRule} RuleSetRule */
/** @typedef {import("./RuleSetCompiler")} RuleSetCompiler */

/**
 * Defines the keys of types type used by this module.
 * @template T
 * @template {T[keyof T]} V
 * @typedef {import("./RuleSetCompiler").KeysOfTypes<T, V>} KeysOfTypes
 */

/** @typedef {KeysOfTypes<RuleSetRule, RuleSetConditionOrConditions | RuleSetConditionOrConditionsAbsolute>} BasicMatcherRuleKeys */

const PLUGIN_NAME = "BasicMatcherRulePlugin";

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

	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @param {RuleSetCompiler} ruleSetCompiler the rule set compiler
	 * @returns {void}
	 */
	apply(ruleSetCompiler) {
		ruleSetCompiler.hooks.rule.tap(
			PLUGIN_NAME,
			(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}`,
						/** @type {RuleSetConditionOrConditions | RuleSetConditionOrConditionsAbsolute} */
						(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;