import { int } from "things";
/** Nonterminals start with an uppercase letter, everything else is a terminal. */
export type Sym = string;
export declare function isNonterminal(sym: Sym): boolean;
export declare function isTerminal(sym: Sym): boolean;
export declare class GrammarSymbols {
    #private;
    constructor();
    handleOf(syms: Sym[]): int | undefined;
    symsOf(handle: int): Sym[] | undefined;
    handlesOf(handle: int): int[] | undefined;
    symOf(handle: int): string | undefined;
    ensure(syms: Sym[]): int;
    declare_distinct(distinct_handles: Iterable<int>): void;
    declare_distinct_symbols(symbols: Iterable<Sym>): void;
    declare_empty(possibly_empty: Sym, nonempty_version: Sym): void;
    declare_final(f: Sym): void;
    nonemptyVersionOf(possibly_empty: int): int | undefined;
    distinct(terminal1: int, terminal2: int): boolean;
    is_final(h: int): boolean;
}