/**
 * Transform full month names to 3-letter abbreviations.
 * Case-insensitive matching, preserves original case style in abbreviation.
 */
export declare function abbreviateMonth(text: string): string;
/**
 * Compute label indices using smart interval selection.
 * Prefers clean intervals (every 2nd, 3rd, etc.) over rigid label count limits.
 */
export declare function computeEquallySpacedIndices(totalCount: number, maxCount: number): number[];
/**
 * Compute a set of label indices to render given total slots, a set of candidates
 * (e.g., non-empty labels), available width and minimum pixel spacing.
 * Uses equal-interval ideal positions, mapped to nearest available candidates.
 */
export declare function computeLabelSelection(totalCount: number, candidates: number[], chartWidthPx: number, minLabelSpacingPx: number): Set<number>;
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