The offset and size properties are of the wrong type.

[Hideki Tanaka]

I don't think TypeScript allows you to specify keys and their types for arrays, but the source code does.

I think it would be better to modify the ShadowProps interface like this:

interface ShadowProps {
  // ...
  offset?: (number | string)[];
  // ...
  size?: number[];
  // ...
}

Alternatively, you can use the key as follows (not recommended for compatibility reasons):

interface ShadowProps {
  // ...
  offset?: { x: number | string, y: number | string };
  // ...
  size?: { width: number, height: number };
  // ...
}

[Bruno]

Hi @tuxsnct! This TS functionality is available since V4, released a year ago. Please, update your typescript version! 🤓

[Bruno]

It's called labeled tuple: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-0.html#labeled-tuple-elements

[Hideki Tanaka]

Oops, looks like it.
Thanks!