import type { IcuMessage } from '@generaltranslation/format/types';
/**
 * Given an ICU string adds identifiers to each _gt_ placeholder
 * indexVars('Hello {_gt_} {_gt_} World') => 'Hello {_gt_1_} {_gt_2_} World'
 */
export declare function indexVars(icuString: IcuMessage): string;