import { CCliArgGroup, CCliArgGroupOptions } from '../c-cli-arg-group';
import { CCliConditionalValue } from '../c-cli-conditional-value';
/** A {@link CCliFlagArgGroup} always returns a value `true` (or `undefined`) */
declare type CCliFlagArgGroupValue = true;
/** A {@link CCliFlagArgGroup} is always optional */
declare type CCliFlagArgGroupOptional = true;
/** Options for {@link CCliFlagArgGroup} */
export declare type CCliFlagArgGroupOptions = Pick<CCliArgGroupOptions<true>, 'description' | 'hidden'>;
/** A `boolean`-valued command-line argument group. This argument group type
 * only makes sense as a named argument. For example if a CLI has a named flag
 * argument group "foo", here's how that CLI behaves:
 * ```plaintext
 * $ cli           // named value "foo" is `undefined`
 * $ cli --foo     // named value "foo" is `true`
 * $ cli --foo bar // usage error
 * ``` */
export declare class CCliFlagArgGroup extends CCliArgGroup<CCliFlagArgGroupValue, CCliFlagArgGroupOptional> {
    parse(args: string[] | undefined): CCliConditionalValue<CCliFlagArgGroupValue, CCliFlagArgGroupOptional>;
    /** Factory for boolean-valued {@link CCliFlagArgGroup}s */
    static create(options?: CCliFlagArgGroupOptions): CCliFlagArgGroup;
}
export {};
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