typescript error accessing globalThis property

Question

i am trying to access the globalThis property, but get the error:

Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature`.

// both getting...
if (!globalThis.foo) {}

// and setting...
globalThis.foo = 'bar

the only thing i can find online about this, refers to using window, and provides declarations to support it, but not for globalThis. anyone know how to support this?

@Wyck i added some example code, but i get the error literally doing anything with globalThis — brewster, Oct 04 '20 at 15:10

score 13 · Accepted Answer · answered Oct 04 '20 at 16:15

According to the globalThis documentation, it looks like the "right" way to do this is to declare a global var named foo. That will add to globalThis.

If your code is in global scope, then this will work:

var foo: string;

If your code is in a module, you need to wrap that in a global declaration:

export const thisIsAModule = true; // <-- definitely in a module

declare global {
    var foo: string;
}

After that, you should be able to access globalThis.foo as desired:

globalThis.foo = "bar"; // no error

Playground link to code

typescript error accessing globalThis property

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