import { ArgParser, Register } from './argparser';
import { ProvidesHelp, Descriptive, ShortDoc, LongDoc, EnvDoc } from './helpdoc';
import { Type, OutputOf, HasType } from './type';
import { Default } from './default';
import { AllOrNothing } from './utils';
declare type FlagConfig<Decoder extends Type<boolean, any>> = LongDoc & HasType<Decoder> & Partial<ShortDoc & Descriptive & EnvDoc> & AllOrNothing<Default<OutputOf<Decoder>>>;
/**
 * A decoder from `string` to `boolean`
 * works for `true` and `false` only.
 */
export declare const boolean: Type<string, boolean>;
export declare function fullFlag<Decoder extends Type<boolean, any>>(config: FlagConfig<Decoder>): ArgParser<OutputOf<Decoder>> & ProvidesHelp & Register & Partial<Descriptive>;
declare type BooleanType = Type<boolean, boolean>;
/**
 * Decodes an argument which is in the form of a key and a boolean value, and allows parsing the following ways:
 *
 * - `--long` where `long` is the provided `long`
 * - `-s=value` where `s` is the provided `short`
 * Shorthand forms can be combined:
 * - `-abcd` will call all flags for the short forms of `a`, `b`, `c` and `d`.
 * @param config flag configurations
 */
export declare function flag<Decoder extends Type<boolean, any>>(config: FlagConfig<Decoder>): ArgParser<OutputOf<Decoder>> & ProvidesHelp & Register & Partial<Descriptive>;
export declare function flag(config: LongDoc & Partial<HasType<never> & ShortDoc & Descriptive & EnvDoc> & AllOrNothing<Default<OutputOf<BooleanType>>>): ArgParser<OutputOf<BooleanType>> & ProvidesHelp & Register & Partial<Descriptive>;
export {};