The type 'typeof globalThis' does not have an index signature, therefore the element is implicitly of type 'any'. Error code: ts(7017) in TypeScript

I'm encountering an issue with my input handleChange function. Specifically, I am receiving the following error message: Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature.ts(7017) when attempting to update the state using this.setState. Here is the snippet of code that is causing the problem:

const [first_name, setFname] = useState<string>();
  const [last_name, setLname] = useState<string>();
  const [email, setEmail] = useState<string>();
  const [avatar, setAvatar] = useState();
  
   const handleChange = (e:any) => {
        const { name, value } = e.target;
        this.setState({ [name]: value });
    }

Answer №1

The main issue at hand is:

this.setState({ [name]: value });

It appears that this code snippet is intended for a class component, however, hooks are typically used in functional components (or other hooks) instead of class components. In functional components and hooks, you should utilize the setters provided by useState rather than a central setState method.

In addition, the error message suggests that TypeScript believes the code is within global scope, which is unusual since hooks are not typically used there.

Furthermore, TypeScript should be flagging issues with your useState calls because you have specified string as the generic type parameter without providing an initial value. Without an initial value, the default will be undefined, which does not match the expected string type.


While slightly off-topic, the specific error message indicates that the type of this in the code (typeof globalThis) does not include a defined setState property. Therefore, this.setState is implicitly assigned the any type by TypeScript due to lack of type information. Since you are treating it as a function, TypeScript is warning you that it cannot infer that this.setState is indeed a function.

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