/**
 * Composite an overlay row onto a base row. A row that spans the whole
 * terminal hides the base entirely, so it skips the grapheme scan of the base
 * line that `compositeTuiLine` performs for partial overlays.
 */
export declare function compositeOverlayLine(baseLine: string, overlayLine: string, startCol: number, overlayWidth: number, totalWidth: number): string;
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