/**
 * Expr-lang lexer/tokenizer
 * Handles: identifiers, numbers, strings, bytes literals, operators, comments
 */
import { Token } from './types';
export declare class Lexer {
    private input;
    private pos;
    private line;
    private column;
    private startLine;
    private startColumn;
    reset(input: string): void;
    next(): Token;
    private skipWhitespace;
    private skipComments;
    private readString;
    private readBacktickString;
    private readByteLiteral;
    private readNumber;
    private readIdentOrKeyword;
    private readOperatorOrBracket;
    private isDigit;
    private isIdentStart;
    private isIdentPart;
    private makeToken;
}