/**
 * The string value NumberInput hands to Ark's NumberInput.Root.
 *
 * An empty value (`null`, `undefined` or NaN) becomes `''`, a controlled empty value. Passing
 * `undefined` instead would switch Ark to its internal state, which keeps showing the last
 * number — so clearing a bound from outside (e.g. a filter going from [10, 100] to
 * [undefined, 100]) would leave the 10 on screen. The one exception: an `undefined` value
 * with a `defaultValue` set stays `undefined`, so uncontrolled use keeps working.
 */
export declare function toNumberInputValue(value: number | null | undefined, locale: string, hasDefaultValue?: boolean): string | undefined;