import { AnyNode, CommandNode, GlobalsInjected, InferMaybeRequiredChildren, InferRequiredChildren, NodeType, ProgramNode, ProgramOrCommandChildren, UnwrapRequiredChildren } from './types';
import { AnyOptions, TableFormatOptions, ValidOptions } from './types-internal';
declare const several: <T>(arr: readonly T[], fn: (item: T, index: number) => boolean) => boolean;
declare const sum: (arr: readonly number[]) => number;
declare function withDefault<T>(value: T, defaultValue: Exclude<T, null | undefined>): Exclude<T, null | undefined>;
declare function validateChildren(children: readonly AnyNode[], validTypes: readonly NodeType[]): void;
declare function getNodeChildren<C extends ProgramOrCommandChildren>(children: C): {
    _requireAll: InferRequiredChildren<C>;
    _requireAny: InferMaybeRequiredChildren<C>;
    children: UnwrapRequiredChildren<C>;
};
declare function validateEmptyChildren(children: readonly never[]): void;
declare function validateName(name: unknown): asserts name is string;
declare function serializeOptions(options: AnyOptions, validOptions: ValidOptions): Record<string, unknown>;
declare function formatTable(table: readonly (readonly string[])[], options: TableFormatOptions): string;
declare function sortByName(a: {
    name: string;
}, b: {
    name: string;
}): 0 | 1 | -1;
declare function createHelp<N extends string, C extends ProgramOrCommandChildren>(schema: ProgramNode<N, C> | CommandNode<N, C>, globals: GlobalsInjected, error?: string): string;
declare function exitWithHelp(help: string): void;
declare function formatNodeName(node: {
    name: string;
    _type: string;
}): string;
declare function formatRequiredList(nodes: readonly {
    name: string;
    _type: string;
}[]): string;
declare function extractErrorMessage(error: unknown): string;
declare function pluralize<T extends string>(text: T): `${T}s`;
export { several, sum, validateChildren, validateEmptyChildren, getNodeChildren, validateName, serializeOptions, formatTable, sortByName, createHelp, exitWithHelp, formatNodeName, formatRequiredList, extractErrorMessage, pluralize, withDefault, };