Wrong exported ValidationError type

ValidationError in fast-xml-validator/lib/fxv.d.cts is definded different than in sources:

In lib:

type ValidationError = {
    err: {
        code: string;
        msg: string,
        line: number,
        col: number
    };
};

In sources (src/ValidationError.js):

export default class ValidationError extends Error {
  constructor(message, code, line, col) {
    super(message);
    this.name = this.constructor.name;
    this.code = code;
    this.line = line;
    this.col = col;
    Error.captureStackTrace?.(this, this.constructor);
  }
}

I can't properly use the class in typescript

Start by comparing the exported declaration in fast-xml-validator/lib/fxv.d.cts with the implementation in src/ValidationError.js. Update the public type so it accurately represents the exported ValidationError class and its fields, allowing TypeScript users to use the class correctly.