import { type ISeriesDataItem } from "../typings/unsafe.js";
/**
 * Removes consecutive items with `y === 0` from the beginning of the array.
 * Used for funnel charts to skip leading zero-value entries.
 */
export declare function skipLeadingZeros(values: ISeriesDataItem[]): ISeriesDataItem[];
/**
 * Recursively replaces `null` / `undefined` values of `y` with `0` in a series data tree.
 * Used for waterfall charts where Highcharts needs numeric values instead of nulls.
 */
export declare function coalesceNulls(value: ISeriesDataItem): ISeriesDataItem;
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