Discussion on: Use Custom HTML Attribute's in TypeScript

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create any file with extension .d.ts in your project
and just extend the button interface in the JSX namespace

declare namespace JSX {
    interface ExtendedButton
        extends React.DetailedHTMLProps<
            React.ButtonHTMLAttributes<HTMLButtonElement>,
            HTMLButtonElement
        > {
        customAttribute?: string;
    }

    interface IntrinsicElements {
        button: ExtendedButton;
    }
}