Property ‘scrollto’ does not exist on type ‘never’.

The error message “property ‘scrollto’ does not exist on type ‘never'” typically occurs in TypeScript when you try to access a property or method that does not exist on a specific type. This error is usually displayed in the code editor where you will see a red squiggly line under the corresponding code.

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

interface Person {
    name: string;
    age: number;
}

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

console.log(person.scrollto); // Error: Property 'scrollto' does not exist on type 'Person'
    

In the above example, we have defined an interface called ‘Person’ with two properties: ‘name’ and ‘age’. Then, we create an object ‘person’ based on that interface. When we try to access the non-existing property ‘scrollto’ on the ‘person’ object, TypeScript throws an error with the message “Property ‘scrollto’ does not exist on type ‘Person'”.

The error occurs because TypeScript provides static type checking and it tries to ensure that you only access properties and methods that are defined on a given type.

In order to fix this error, you have a few options:

1. If the property or method you are trying to access is intended to be available on the type, you can add it to the interface definition. For example:

interface Person {
    name: string;
    age: number;
    scrollto: () => void; // Added the 'scrollto' property as a function that takes no arguments and returns nothing
}

const person: Person = {
    name: "John Doe",
    age: 25,
    scrollto: () => {
        // Implementation of the scrollto method
    }
};

person.scrollto(); // No error
        

2. If the property or method does not belong to the type and you are sure that it is available from some external dependency, you may need to install the appropriate type definition or declaration file. These files usually have a `.d.ts` extension. Once installed, TypeScript will recognize the property or method as expected.
3. If you are certain that the property or method should not be there, you need to review your code and remove any references to that property or method.

By addressing the error according to one of the above options, you will be able to resolve the issue of the property ‘scrollto’ not existing on type ‘never’ or any other type.