48 lines
1.1 KiB
JavaScript
48 lines
1.1 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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class GlobalRuntimeModule extends RuntimeModule {
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constructor() {
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super("global");
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}
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/**
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* @returns {string | null} runtime code
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*/
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generate() {
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return Template.asString([
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`${RuntimeGlobals.global} = (function() {`,
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Template.indent([
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"if (typeof globalThis === 'object') return globalThis;",
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"try {",
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Template.indent(
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// This works in non-strict mode
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// or
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// This works if eval is allowed (see CSP)
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"return this || new Function('return this')();"
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),
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"} catch (e) {",
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Template.indent(
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// This works if the window reference is available
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"if (typeof window === 'object') return window;"
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),
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"}"
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// It can still be `undefined`, but nothing to do about it...
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// We return `undefined`, instead of nothing here, so it's
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// easier to handle this case:
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// if (!global) { … }
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]),
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"})();"
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]);
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}
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}
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module.exports = GlobalRuntimeModule;
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