@theme-ui/components/dist/declarations/src/types.d.ts

Primitive layout, typographic, and other components for use with Theme UI.

export type Assign<T, U> = {
    [P in keyof (T & U)]: P extends keyof T ? T[P] : P extends keyof U ? U[P] : never;
};
export interface ForwardRef<T, P> extends React.ForwardRefExoticComponent<React.PropsWithoutRef<P> & React.RefAttributes<T>> {
}