Element implicitly has an ‘any’ type because type ‘typeof globalthis’ has no index signature

The error message “element implicitly has an ‘any’ type because type ‘typeof globalThis’ has no index signature” occurs when you are trying to access a property or method on an object without specifying its type explicitly, and the object’s type does not have an index signature.

To understand this error, let’s consider an example:

    
      const person = {
        name: 'John Doe',
        age: 25
      };

      const key = 'name';
      const value = person[key];
    
  

In the above example, we have an object person with properties name and age. We also have a variable key which holds the string 'name'. We are trying to access the property of person using the variable key as the index, but TypeScript gives us the error “Element implicitly has an ‘any’ type because type ‘typeof globalThis’ has no index signature”.

The reason for this error is that TypeScript cannot infer the type of the property being accessed using an index variable because the object’s type typeof globalThis does not have an index signature.

To fix this error, you can either specify the type of the object explicitly or provide an index signature to the object’s type. Here are the solutions:

• Specify the type explicitly:

          
            const person: Record<'name', string> = { // Assuming name property is of type string
              name: 'John Doe',
              age: 25
            };
  
            const key = 'name';
            const value = person[key];
          
        

  In this solution, we are explicitly specifying the type of the person object using the Record utility type. The utility type Record allows us to define a type with specific keys and corresponding value types. Here, we assume that the name property is of type string.

• Add an index signature to the object’s type:

          
            interface Person {
              name: string;
              age: number;
              [key: string]: any;
            }
  
            const person: Person = {
              name: 'John Doe',
              age: 25
            };
  
            const key = 'name';
            const value = person[key];
          
        

  In this solution, we define an interface Person which includes an index signature. The index signature allows us to access properties of any key as long as their corresponding values match the defined type. Here, the index signature allows any key of type string to match with a value of type ‘any’. This means we can access properties using an index without the error.

By specifying the type explicitly or adding an index signature, you can resolve the error “element implicitly has an ‘any’ type because type ‘typeof globalThis’ has no index signature” and access properties on objects without any issues.