/**
 * Number formatter that replicates the exact nFormatter function
 * from the current implementation
 */
export declare function formatEnergyValue(num: number, digits?: number, fractional?: boolean): string;
/**
 * Format tooltip text to match current implementation
 * Template: "Year - Energy Source<br/>Formatted Value"
 */
export declare function formatTooltipText(year: number, energySource: string, value: number, fractional?: boolean): string;
/**
 * Utility to determine if current mode is fractional
 */
export declare function isFractionalMode(representation: string): boolean;
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