webpack/lib/IgnorePlugin.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";

const RawModule = require("./RawModule");
const EntryDependency = require("./dependencies/EntryDependency");
const createSchemaValidation = require("./util/create-schema-validation");

/** @typedef {import("../declarations/plugins/IgnorePlugin").IgnorePluginOptions} IgnorePluginOptions */
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./NormalModuleFactory").ResolveData} ResolveData */

const validate = createSchemaValidation(
	require("../schemas/plugins/IgnorePlugin.check.js"),
	() => require("../schemas/plugins/IgnorePlugin.json"),
	{
		name: "Ignore Plugin",
		baseDataPath: "options"
	}
);

const PLUGIN_NAME = "IgnorePlugin";

class IgnorePlugin {
	/**
	 * @param {IgnorePluginOptions} options IgnorePlugin options
	 */
	constructor(options) {
		validate(options);
		this.options = options;
		this.checkIgnore = this.checkIgnore.bind(this);
	}

	/**
	 * Note that if "contextRegExp" is given, both the "resourceRegExp" and "contextRegExp" have to match.
	 * @param {ResolveData} resolveData resolve data
	 * @returns {false|undefined} returns false when the request should be ignored, otherwise undefined
	 */
	checkIgnore(resolveData) {
		if (
			"checkResource" in this.options &&
			this.options.checkResource &&
			this.options.checkResource(resolveData.request, resolveData.context)
		) {
			return false;
		}

		if (
			"resourceRegExp" in this.options &&
			this.options.resourceRegExp &&
			this.options.resourceRegExp.test(resolveData.request)
		) {
			if ("contextRegExp" in this.options && this.options.contextRegExp) {
				// if "contextRegExp" is given,
				// both the "resourceRegExp" and "contextRegExp" have to match.
				if (this.options.contextRegExp.test(resolveData.context)) {
					return false;
				}
			} else {
				return false;
			}
		}
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.normalModuleFactory.tap(PLUGIN_NAME, nmf => {
			nmf.hooks.beforeResolve.tap(PLUGIN_NAME, resolveData => {
				const result = this.checkIgnore(resolveData);

				if (
					result === false &&
					resolveData.dependencies.length > 0 &&
					resolveData.dependencies[0] instanceof EntryDependency
				) {
					resolveData.ignoredModule = new RawModule(
						"",
						"ignored-entry-module",
						"(ignored-entry-module)"
					);
				}

				return result;
			});
		});
		compiler.hooks.contextModuleFactory.tap(PLUGIN_NAME, cmf => {
			cmf.hooks.beforeResolve.tap(PLUGIN_NAME, this.checkIgnore);
		});
	}
}

module.exports = IgnorePlugin;