export declare class TokenSource<K> {
    private tokens;
    private currentPos;
    constructor(tokens: Array<K>);
    get pos(): number;
    iterate(start: number, callback: (token: K, tokenNo: number) => void): void;
    append(tokens: Array<K>): number;
    trim(pos: number): void;
    rewind(tokenNo?: number): void;
}
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