Typescript parameters provide specific data types for functions that can accept either a single argument or two arguments, such as Element.scrollBy

One question I have is how to access the options parameter in the scrollBy() method.

Parameters<Element["scrollTo"]>

When I use [x: number, y: number] as per the documentation, it does not include options?: ScrollToOptions.

scrollTo(options?: ScrollToOptions): void;
scrollTo(x: number, y: number): void;

Answer №1

Take a look at this particular issue and refer to the TS documentation:

When making inferences from a type with multiple call signatures (such as an overloaded function), the inferences are derived from the last signature, which is typically the most general catch-all case. Overload resolution cannot be based on a list of argument types.

Parameters always returns the last call signature.

In this scenario, it would be beneficial to use:

const foo:Element["scrollTo"]=(...args:unknown[])=>{

}

https://i.sstatic.net/sobHb.png

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