export interface ValueFormat {
    /** ISO currency code (e.g. 'USD', 'ILS'). When set, formats as currency. */
    currency?: string;
    prefix?: string;
    suffix?: string;
    /** Compact large numbers (1.2K, 3.4M). Default true for axis ticks. */
    compact?: boolean;
    maximumFractionDigits?: number;
}
export declare function formatValue(value: number, fmt?: ValueFormat): string;
/** Format an x label that may be an ISO date; otherwise pass through. */
export declare function formatLabel(label: string): string;
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