Incorporating data types into a constant in Typescript/Javascript

Imagine I wanted to ensure these variables are string objects by adding a type string declaration to this variable assignment.

What is the correct way to accomplish this?

const { someID, someName, someAPIenvironment } = useParams();

This is what I attempted:

const {(someID:string), (someName:string), (someAPIenvironment:string)} = useParams();

Is my implementation accurate?

Answer №1

If the type signature of useParams is not helpful, you can create your own and cast it accordingly.

interface MyParams {
    id: string,
    name: string,
    environment: string
}

const { id, name, environment } = useParams() as MyParams;

Keep in mind that this approach does not provide runtime type safety. If you want to ensure they are all strings, you can use typeof(), for example:

typeof(id) === 'string' && typeof(name) === 'string' && typeof(environment) === 'string'

Furthermore, there are validation libraries like yup, which allow you to compare objects to a predefined schema.

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