What is the functionality of typeof globalThis in TypeScript?

Currently, I am delving into the TypeScript definitions repository @types, specifically examining entries like this one for @types/node:

declare var global: typeof globalThis;

I am wondering about the mechanics behind this. Since globalThis is contingent on the runtime environment, how does TypeScript resolve it during compile time? Even after exploring the typeof operator, which I was already familiar with, no concrete details were provided on its actual implementation. How exactly does typescript manage the processing of typeof in scenarios such as this involving globalThis?

typescript

Answer №1

The specifications for the environment in which your code runs are determined by the lib setting in your tsconfig file. By adjusting the lib option, you can specify the expected features and TypeScript will enforce these rules. Different values can be used depending on whether you are writing code for browsers, NodeJS, or WebWorker environments. However, TypeScript does not verify this environment during compilation as it is a runtime concern.

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