/** A choice (`clearable`) is how the reader returns to no value, so it is named, and stays named when
 *  something is selected. A placeholder exists only while nothing is chosen, carries the caller's hint and
 *  leaves on selection; "None" there would read as a value. RN-free so the rule is testable directly. */
export declare function pickerEmptyOptionLabel(opts: {
    clearable?: boolean;
    emptyLabel?: string;
    /** Only when the row is a placeholder. */
    placeholder?: string;
    localeEmptyOption: string;
}): string;