import { Fragment } from "./fragment.js";
export declare namespace Optional {
    type Definition<Def extends Fragment.Definition = Fragment.Definition> = `${Def}?`;
    const type: `${string}?`;
    const parse: {
        meta: {
            type: `${string}?`;
            inherits: () => import("./common.js").GetHandledMethods<{
                type: string;
                inherits: () => import("./common.js").GetHandledMethods<{
                    type: string | number;
                    inherits: () => import("./common.js").GetHandledMethods<{
                        type: string | number | {
                            [x: string]: any;
                        };
                        inherits: () => import("./common.js").GetHandledMethods<{
                            type: string | number | {
                                [x: string]: any;
                            };
                            inherits: () => void;
                            handles: {};
                        }>;
                        handles: {};
                        matches: import("./common.js").DefinitionMatcher<string | number | {
                            [x: string]: any;
                        }>;
                    }>;
                    handles: {};
                    matches: import("./common.js").DefinitionMatcher<string | number>;
                }>;
                handles: {};
                matches: import("./common.js").DefinitionMatcher<string>;
            }>;
            handles: {
                allows: ({ def, components, ctx }: {
                    def: `${string}?`;
                    ctx: import("./common.js").ParseContext;
                } & {
                    components: import("./common.js").ParseResult<string>[];
                }, valueType: import("./common.js").ExtractableDefinition, opts: import("./common.js").AllowsOptions) => import("./common.js").ValidationErrors;
                generate: () => undefined;
                references: ({ components }: {
                    def: `${string}?`;
                    ctx: import("./common.js").ParseContext;
                } & {
                    components: import("./common.js").ParseResult<string>[];
                }, opts: import("./common.js").ReferencesOptions) => string[];
            };
            matches: import("./common.js").DefinitionMatcher<`${string}?`>;
        };
    } & import("./common.js").ParseFunction<`${string}?`, import("./common.js").ParseResult<string>[]>;
    const delegate: `${string}?`;
}