export { FlagsError } from "./src/common/errors/flags.error.js";
export interface Spec {
    names?: string[];
    category?: string;
    description?: string;
}
export interface Context<T> {
    nextIndex: number;
    args: string[];
    index: number;
    arg: string;
    argValue: null | string;
    flags: Partial<T>;
}
export type Test<T> = ((arg: string, ctx: Context<T>) => boolean) & Spec;
export interface Handler<T> {
    (ctx: Context<T>): void;
}
export type Rule<T> = [Test<T>, Handler<T>];
export declare const rule: <T>(test: Test<T>, handler: Handler<T>, ...specs: Spec[]) => Rule<T>;
export declare const flag: <T>(...flags: string[]) => Test<T>;
export declare const command: <T>(command: string) => Test<T>;
/** @deprecated prefer {@link argument} */
export declare const commandOption: <T>(optionName: keyof T) => (arg: string, ctx: Context<T>) => boolean;
/**
 * Creates a handler function for processing command-line flags and updating a property on the flags object.
 *
 * @template T - The type of the flags object.
 * @param propName - The property name on the flags object to update.
 * @param reducer - A function that receives the current context, the accumulated value, and the flag value (as a string or null),
 *   and returns the next value to set for the property.
 * @param requireValue - Optional. If `true` (default), the handler expects a value for the flag; if `false`, the flag is treated as a boolean.
 * @returns A handler function that processes the flag and updates the specified property on the flags object.
 *
 * @remarks
 * The handler uses the provided reducer to determine the next value for the property.
 * If `requireValue` is enabled and no value is provided, the handler advances the argument index.
 */
export declare const flagHandler: <T>(propName: keyof T, reducer: (ctx: Context<T>, accumulate: unknown, value: string | null) => unknown, requireValue?: boolean) => Handler<T>;
export declare const isBooleanAt: <T>(propName: keyof T) => Handler<T>;
export declare const isStringAt: <T>(propName: keyof T) => Handler<T>;
export declare const isNumberAt: <T>(propName: keyof T) => Handler<T>;
export declare const isArrayStringAt: <T>(propName: keyof T) => Handler<T>;
export declare const isArrayNumberAt: <T>(propName: keyof T) => Handler<T>;
export declare const any: <T>() => Test<T>;
export declare const restArgumentsAt: <T>(propName: keyof T) => Handler<T>;
export declare const describe: <D extends Test<any>>(test: D, ...specs: Spec[]) => D;
export declare function getSpecs(rules: Rule<any>[]): Generator<{
    description?: string;
    category?: string;
    names?: string[];
}>;
export declare const makeHelpMessage: (command: string, rules: Rule<any>[], samples?: string[]) => string;
export declare const flags: <T>(args: string[], init: Partial<T>, parses: Rule<T>[]) => Partial<T>;
/**
 * Catch the next argument.
 *
 * @example
 * const options = flags(["foo"],{}, [rule(argument(), isStringAt("arg"))])
 * options.arg // => "foo"
 */
export declare const argument: {
    (): (arg: string, ctx: Context<any>) => boolean;
    visited: Set<symbol>;
};