Need to use 'override' keyword

[johndeighan]

I created my own copy of hera to play with. One of the issues I ran into was that this generated an error in machine.ts:

export class ParseError extends Error {
  name = "ParseError"
  constructor(
    public header: string,
    public body: string | undefined,
    public filename: string,
    public line: number,
    public column: number,
    public offset: number,
  ) {
    let message = `${filename}:${line}:${column} ${header}`
    if (body) message += `\n${body}`
    super(message)
    this.message = message
  }
}

The issue is that name = "ParseError" needs to be override name = "ParseError". I think this only happens in newer versions of TypeScript.
Or maybe there's a configuration to prevent this error, I don't know. I also don't know whether making this change would break hera when using older versions of TypeScript. Just making sure you're aware of the potential problem. I'm using deno, so I'm just going to use their default TypeScript setup.