/**
 * 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 / ...).
 */
import type { CustomNumberFormatConfig } from "./ts-rs/CustomNumberFormatConfig.d.ts";
import type { NumberFormatStyle } from "./ts-rs/NumberFormatStyle.d.ts";
import type { Notation } from "./ts-rs/Notation.d.ts";
import type { DatetimeFormatType } from "./ts-rs/DatetimeFormatType.d.ts";
/**
 * A numeric column's `number_format` (`columns_config` value), exactly as
 * the Style tab's editor WRITES it — the ts-rs projection of the Rust
 * `CustomNumberFormatConfig`, re-composed with its serde-flattened
 * `style` and `notation` families (ts-rs cannot flatten `Option<enum>`,
 * so the Rust type `#[ts(skip)]`s them and they export separately).
 */
export type NumberFormatConfig = CustomNumberFormatConfig & Partial<NumberFormatStyle> & Partial<Notation>;
/**
 * A datetime column's `date_format` (`columns_config` value) — the Rust
 * `DatetimeFormatType` union: a `Simple` preset (`dateStyle` /
 * `timeStyle`), or per-part custom fields discriminated by
 * `format: "custom"`.
 */
export type DateFormatConfig = DatetimeFormatType;
/**
 * `defaults` is the calling plugin's declared default format, filling in
 * the fields `cfg` leaves unset.
 */
export declare function createNumberFormatter(type: string, cfg?: NumberFormatConfig, defaults?: NumberFormatConfig): Intl.NumberFormat;
/**
 * `defaults` is the calling plugin's declared default `date_format`,
 * applied only when `cfg` is wholly absent.
 */
export declare function createDatetimeFormatter(cfg?: DateFormatConfig, defaults?: DateFormatConfig): Intl.DateTimeFormat;
/**
 * `defaults` follows the same contract as
 * [`createDatetimeFormatter`]: the plugin's declared default
 * `date_format`, applied only when `cfg` is wholly absent.
 */
export declare function createDateFormatter(cfg?: DateFormatConfig, defaults?: 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;