Why ErrorListner in TS needs Generic in class?

[IrwinJuice]

• [+ ] I have reproduced my issue using the latest version of ANTLR
• [ -] I have asked at stackoverflow
• [ +] Responses from the above seem to indicate that my issue could be an ANTLR bug
• [+ ] I have done a search of the existing issues to make sure I'm not sending in a duplicate

target Java and TypeScript

Hi,

Could you explain why ErrorListner in TS needs Generic in class ? Maybe I missed something

export declare class ErrorListener<TSymbol>

For example Java doesn't have it

public interface ANTLRErrorListener

The issue is that I can't use same custom ErrorListener in Lexer and Parser.

class ConsoleErrorListener extends ErrorListener<Token> {
  override syntaxError(recognizer: Recognizer<Token>, offendingSymbol: Token, line: number, column: number, msg: string, e: RecognitionException | undefined) {
    console.log(`ERROR line: ${line}; column: ${column}; message: ${msg}`);
  }
}

export function parseTreeStr(input: string) {
  const lexer = createLexer(input);
  lexer.removeErrorListeners();
  lexer.addErrorListener(new ConsoleErrorListener());
  const parser = createParserFromLexer(lexer);
  parser.removeErrorListeners();
  parser.addErrorListener(new ConsoleErrorListener());
  const tree = parser.formula();
  return tree.toStringTree(parser.ruleNames, parser);
}

lexer.addErrorListener for some reason need number as generic.

Argument of type ConsoleErrorListener is not assignable to parameter of type ErrorListener<number>

export declare class Recognizer<TSymbol> {

    state: number;

    removeErrorListeners(): void;
    addErrorListener(listener: ErrorListener<TSymbol>): void; <--- For what we need this generic?
    getErrorListener(): ErrorListener<TSymbol>;
    getLiteralNames(): string[];
    getSymbolicNames(): string[];
}

Thanks.