source: frontend/node_modules/webpack/lib/runtime/GlobalRuntimeModule.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
*/

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const RuntimeModule = require("../RuntimeModule");
const Template = require("../Template");

class GlobalRuntimeModule extends RuntimeModule {
        constructor() {
                super("global");
        }

        /**
         * Generates runtime code for this runtime module.
         * @returns {string | null} runtime code
         */
        generate() {
                return Template.asString([
                        `${RuntimeGlobals.global} = (function() {`,
                        Template.indent([
                                "if (typeof globalThis === 'object') return globalThis;",
                                "try {",
                                Template.indent(
                                        // This works in non-strict mode
                                        // or
                                        // This works if eval is allowed (see CSP)
                                        "return this || new Function('return this')();"
                                ),
                                "} catch (e) {",
                                Template.indent(
                                        // This works if the window reference is available
                                        "if (typeof window === 'object') return window;"
                                ),
                                "}"
                                // It can still be `undefined`, but nothing to do about it...
                                // We return `undefined`, instead of nothing here, so it's
                                // easier to handle this case:
                                //   if (!global) { … }
                        ]),
                        "})();"
                ]);
        }
}

module.exports = GlobalRuntimeModule;