import type { Formatter } from '../../../core/types/formatter.js';
/**
 * Tooltip-friendly stringifier for flame values. When a `Formatter` is provided,
 * the raw value is coerced to a number (missing values become `0`) and handed
 * to it. Without a formatter, the value is stringified (missing values become
 * an empty string) — matching the tooltip conventions used by the other charts.
 */
export declare function formatFlameValue(value: unknown, formatter?: Formatter): string;
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