/**
 * Cross-package helpers for per-column value formatting. Used by both
 * `viewer-datagrid` (cell formatting) and `viewer-charts` (axis ticks,
 * tooltips, legends) so a column's `number_format` / `date_format`
 * configuration produces identical output across plugins.
 *
 * The format configs mirror the `Intl.NumberFormatOptions` /
 * `Intl.DateTimeFormatOptions` shapes one-for-one — they're written
 * straight into the respective constructors. The `date_format.format`
 * discriminator ("simple" | "custom") selects between two derivation
 * paths: simple uses `dateStyle` / `timeStyle`, custom uses the
 * per-field overrides (year / month / day / ...).
 */
export interface NumberFormatConfig {
    style?: "decimal" | "currency" | "percent" | "unit";
    minimumFractionDigits?: number;
    maximumFractionDigits?: number;
    minimumIntegerDigits?: number;
    minimumSignificantDigits?: number;
    maximumSignificantDigits?: number;
    currency?: string;
    currencyDisplay?: "code" | "symbol" | "narrowSymbol" | "name";
    notation?: "standard" | "scientific" | "engineering" | "compact";
    compactDisplay?: "short" | "long";
    useGrouping?: boolean;
}
export interface DateFormatConfig {
    format?: "custom" | string;
    timeZone?: string;
    dateStyle?: "short" | "medium" | "long" | "full" | "disabled";
    timeStyle?: "short" | "medium" | "long" | "full" | "disabled";
    second?: "numeric" | "2-digit" | "disabled";
    minute?: "numeric" | "2-digit" | "disabled";
    hour?: "numeric" | "2-digit" | "disabled";
    day?: "numeric" | "2-digit" | "disabled";
    weekday?: "narrow" | "short" | "long" | "disabled";
    month?: "numeric" | "2-digit" | "narrow" | "short" | "long" | "disabled";
    year?: "numeric" | "2-digit" | "disabled";
    hour12?: boolean;
    fractionalSecondDigits?: 1 | 2 | 3;
}
export declare function createNumberFormatter(type: string, cfg?: NumberFormatConfig): Intl.NumberFormat;
export declare function createDatetimeFormatter(cfg?: DateFormatConfig): Intl.DateTimeFormat;
export declare function createDateFormatter(cfg?: DateFormatConfig): Intl.DateTimeFormat;
/**
 * Recover the source column name from a synthetic split-by path. Split
 * pivoting produces paths of the form `<split_val_1>|...|<source_col>`;
 * per-column config (formatters, aggregate styling, …) is always keyed
 * on the trailing source column.
 */
export declare function sourceColumn(path: string): string;