/**
* RFC 9651 Structured Field Values parser. Internal use; not exported from
* the public surface yet. Used by Cache-Status (RFC 9211), Repr-Digest /
* Content-Digest (RFC 9530), and other SF-based headers.
*
* Implements parsers for the three top-level types: Item, List, Dictionary.
* Returns null on parse failure (no exceptions in the hot path).
*/
export type SfBareItem = number | string | boolean | {
	token: string;
} | Uint8Array;
export type SfParams = Record<string, SfBareItem>;
export type SfItem = {
	value: SfBareItem;
	params: SfParams;
};
export type SfInnerList = {
	value: SfItem[];
	params: SfParams;
};
export type SfListMember = SfItem | SfInnerList;
export type SfDict = Record<string, SfItem | SfInnerList>;
export declare function parseSfItem(input: string): SfItem | null;
export declare function parseSfList(input: string): SfListMember[] | null;
export declare function parseSfDict(input: string): SfDict | null;