init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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/*
    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");
    }
 
    /**
     * @returns {string} 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;