/**
 * Built-in formula functions and the per-evaluation function registry (F1).
 *
 * A {@link FormulaFn} receives its arguments already evaluated and with ranges
 * flattened into the value list (the evaluator does the expansion), so a custom
 * function is just `(args) => value`. Numeric functions skip non-numeric values
 * (matching the aggregation engine) but propagate error values, the spreadsheet
 * convention. `IF` is not here: the evaluator handles it directly so it can
 * short-circuit (only the taken branch is evaluated).
 *
 * Pure: no DOM, no grid knowledge.
 */
import { type CellValue, type FormulaError } from './errors.js';
/** A formula function: evaluated arguments in (ranges already flattened), a value out. */
export type FormulaFn = (args: CellValue[]) => CellValue;
/**
 * Create a fresh function registry seeded with the v1 built-ins, keyed by
 * upper-case name. Each grid owns its own registry so `registerFormulaFunction`
 * adds custom functions without leaking across instances. `IF` is intentionally
 * absent: the evaluator implements it for short-circuit semantics.
 */
export declare function createFunctionRegistry(): Map<string, FormulaFn>;
/** The names of the built-in functions (upper-case), for documentation/tests. */
export declare const BUILTIN_FUNCTION_NAMES: readonly string[];
export type { FormulaError };