Difficulty returning custom errors

I may be missing something, but as far as I can see, the only way to really customize the error returned from resolver functions is via the customFormatErrorFn option. The headers, status code, and graphqlErrors members of errors returned from resolver functions are ignored. The only member of the thrown error that is used is the result of toString.

https://github.com/graphql/express-graphql/blob/43ba6061388b9a1fc0119dc8e909c7a4391c70e6/src/index.ts#L371

On this line, error is set up, and from this point on the incoming rawError is not referenced. This means that many of the if statements following are pointless since the condition will always return the same result.

for example:

   ...
   response.statusCode = error.status; // always 500
   const { headers } = error; // always comes from `httpError`
   if (headers != null) {
        for (const [key, value] of Object.entries(headers)) {
          response.setHeader(key, String(value));
        }
    }

   if (error.graphqlErrors == null) // always null
   ...

graphql / express-graphql

Difficulty returning custom errors #732