Quote interface field names when needed

[xkr47]

I was validating http headers using joi and tried to create a type for it

const acceptLanguage = Joi.string().example('sv').regex(/^..$/)
  .description('The language code to use e.g. en, sv, fi etc');
export const MyRequestHeadersSchema = Joi.object({
  'accept-language': acceptLanguage.required()
});

but this resulted in

export interface CreateOrderRequestHeaders {
  accept-language: string;
}

.. when the expected result would be:

export interface CreateOrderRequestHeaders {
  'accept-language': string;
}

So this PR attempts to add proper quoting of field names, when needed.

[leemhenson]

Hi @xkr47

We're no longer using or maintaining this library, having switched to use https://github.com/gcanti/io-ts/ instead. If you would like to take ownership of it, I would be happy to transfer it to you. I'd recommend io-ts as much better approach though.

[xkr47]

Thanks for the response, will look at it!