webpack/lib/dependencies/RequireEnsurePlugin.js

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

const RequireEnsureItemDependency = require("./RequireEnsureItemDependency");
const RequireEnsureDependency = require("./RequireEnsureDependency");

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

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

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

class RequireEnsurePlugin {

	apply(compiler) {
		compiler.hooks.compilation.tap("RequireEnsurePlugin", (compilation, {
			normalModuleFactory
		}) => {
			compilation.dependencyFactories.set(RequireEnsureItemDependency, normalModuleFactory);
			compilation.dependencyTemplates.set(RequireEnsureItemDependency, new RequireEnsureItemDependency.Template());

			compilation.dependencyFactories.set(RequireEnsureDependency, new NullFactory());
			compilation.dependencyTemplates.set(RequireEnsureDependency, new RequireEnsureDependency.Template());

			const handler = (parser, parserOptions) => {
				if(typeof parserOptions.requireEnsure !== "undefined" && !parserOptions.requireEnsure)
					return;

				new RequireEnsureDependenciesBlockParserPlugin().apply(parser);
				parser.hooks.evaluateTypeof.for("require.ensure").tap("RequireEnsurePlugin", ParserHelpers.evaluateToString("function"));
				parser.hooks.typeof.for("require.ensure").tap("RequireEnsurePlugin", ParserHelpers.toConstantDependency(parser, JSON.stringify("function")));
			};

			normalModuleFactory.hooks.parser.for("javascript/auto").tap("RequireEnsurePlugin", handler);
			normalModuleFactory.hooks.parser.for("javascript/dynamic").tap("RequireEnsurePlugin", handler);
		});
	}
}
module.exports = RequireEnsurePlugin;