graphql / graphql-js / 1084

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Add `message` and `locations` as enumerable properties on GraphQLError.

As brought up in #426, it can be confusing to return instances of `Error` from the `graphql` function since the expectation is that you will call `JSON.stringify` and submit the result to a client. Calling `JSON.stringify` on an instance of `Error` results in `{}` since it has no enumerable properties.

In order to have behavior that matches the GraphQL spec easier to achieve, this makes these two properties enumerable. I think this will be the best of both worlds - anyone who wishes the operate directly on the Error instances will still have the ability to do so (for example, to access the `stack` property), but it can still be converted to JSON directly and get a spec-compliant result.

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