import type { ANTLRErrorListener } from "antlr4ng";
export interface SyntaxDiagnostic {
    /** The parser's human-readable message (e.g. "mismatched input 'WHERE'"). */
    message: string;
    /** 1-based line of the offending token. */
    line: number;
    /** 0-based column of the offending token. */
    column: number;
    /** 0-based char offset of the offending token start; absent for lexer errors. */
    offset?: number;
    /** Offending token text length; 1 when unknown (lexer error / no token). */
    length: number;
}
export interface ErrorCollector {
    /** Attach to both the lexer and the parser via addErrorListener. */
    listener: ANTLRErrorListener;
    /** Captured diagnostics, in report order. */
    readonly diagnostics: SyntaxDiagnostic[];
    /** Clear captured diagnostics — called before the LL retry to discount the SLL attempt. */
    reset(): void;
}
export declare function makeErrorCollector(): ErrorCollector;