source: trip-planner-front/node_modules/webpack/lib/dependencies/RequireEnsurePlugin.js

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

"use strict";

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

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

const {
        evaluateToString,
        toConstantDependency
} = require("../javascript/JavascriptParserHelpers");

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

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

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

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