export interface SurveyFieldDropdownOption {
    value: string;
    label: string;
}
interface SurveyFieldDropdown {
    inputType?: string;
    placeholder?: string;
    options?: SurveyFieldDropdownOption[];
    defaultValue?: unknown;
}
export interface NormalizedSurveyFieldDropdown {
    placeholder?: string;
    options: SurveyFieldDropdownOption[];
    defaultValue?: unknown;
    currentValue: string;
}
/**
 * Converts the legacy first `{ value: '-', label: 'Choose ...' }` option into
 * a real select placeholder. Existing surveys can therefore keep their saved
 * configuration without exposing the sentinel as a submit-able answer.
 */
export declare function normalizeSurveyFieldDropdown(field: SurveyFieldDropdown, value: string): NormalizedSurveyFieldDropdown;
export {};