[TypeScript] Should reactHelpers functions be Type Guard or not?

I have written typings to reactHelpers (#9565) but these functions (isMuiComponent and isMuiElement) are used for type checking. So I think it is better to declare these functions as type guard.

By implementation,

export function isMuiElement(element: any, muiNames: Array<string>)
    : element is ReactElement<P> & { type: { muiName: string } };
export function isMuiComponent<P>(element: any, muiNames: Array<string>): element is { muiName: string };

is considerable declaration (of course it looks not simple, so not good).

Is there any good type declaration for MUI element/component? or already exist? or the above functions should not be type guard (keep current, simply return boolean)?

[SSW-SCIENTIFIC]

@pelotom Ok I understood, and open PR without type parameter soon.

[pelotom]

Oh! But obviously if you found it to have a certain name, then it definitely has that name. So it should not be optional. Re-corrected 😄