import type { InternalOptions } from './types.js';
export declare function copyOptions(options: InternalOptions | undefined): InternalOptions;
export declare function ensureFlagExists(item: string, options: InternalOptions): void;
export declare function ensureSpacesExists(options: InternalOptions): void;
export declare function ensureAlwaysArrayExists(options: InternalOptions): void;
export declare function ensureKeyExists(key: string, options: InternalOptions): void;
export declare function checkFnExists(key: string, options: InternalOptions): boolean;