export interface HighlightRange {
    /** Index of the first highlighted character. */
    start: number;
    /** Index one past the last highlighted character. */
    end: number;
}
export interface HighlightSegment {
    text: string;
    highlighted: boolean;
}
/**
 * Cut `value` into alternating plain and highlighted runs.
 *
 * Split out from the composer because it is the part that can be wrong in a way
 * nobody sees: the mirror it feeds sits behind a real text field, so a segment
 * boundary off by one paints the tint half a character adrift and everything
 * still looks like a working composer. Ranges arrive from a caller that is
 * matching text it does not control, so overlapping, unsorted, reversed and
 * out-of-bounds inputs are all normal here — none of them may drop or duplicate
 * a character, because the mirror has to lay out identically to the field it
 * sits behind or the tint drifts from the words.
 */
export declare function splitHighlightSegments(value: string, ranges: readonly HighlightRange[]): HighlightSegment[];