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?

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?

• javascript
• typescript

• You should provide code that demonstrates the problem. – Wyck Commented Oct 4, 2020 at 14:35
• @Wyck i added some example code, but i get the error literally doing anything with globalThis – brewster Commented Oct 4, 2020 at 15:10
• For anyone trying to use it with a library: let cached = (global as any).mongoose – TechWisdom Commented May 6, 2024 at 20:24

1 Answer 1

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