import { Token } from './token';
import { TokenType } from './token-type';
export declare class TokenStream {
    private _tokens;
    private _expression;
    private _currentPosition;
    readonly expression: string;
    readonly token: Token;
    constructor(_tokens: Token[], _expression: string);
    next(): Token;
    expect(type: TokenType, value: string, message?: string): void;
}