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30 lines
No EOL
1.3 KiB
TypeScript
30 lines
No EOL
1.3 KiB
TypeScript
/**
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* Returns the base global object available to the current JS platform.
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* - In browsers, returns `window`.
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* - In WebWorkers, returns `self`.
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* - In Node, returns `global`.
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*/
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export default function getGlobalObject(): typeof globalThis {
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// Evergreen browsers have started defining 'globalThis'.
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// Refer to https://devblogs.microsoft.com/typescript/announcing-typescript-3-4/#type-checking-for-globalthis
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// and its referenced polyfill. Said polyfill is very complex, so we opt for this far leaner variant.
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if(typeof globalThis != 'undefined') {
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return globalThis; // Not available in IE or older Edge versions
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// @ts-ignore (TS will throw errors for whatever platform we're not compiling for.)
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} else if(typeof window != 'undefined') {
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// @ts-ignore
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return window; // The browser-based classic
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// @ts-ignore
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} else if(typeof self != 'undefined') {
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// @ts-ignore
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return self; // WebWorker global
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} else {
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// Assumption - if neither of the above exist, we're in Node, for unit-testing.
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// Node doesn't have as many methods and properties as the other two, but what
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// matters for us is that it's the base global.
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//
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// Some other headless JS solutions use 'this' instead, but Node's enough for our needs.
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// @ts-ignore
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return (global as any) as typeof globalThis;
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}
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} |