Is there some good way to type check with `graphql` ? about graphql-relay-js HOT 4 CLOSED

Hey!

I think this is a great question and interesting problem. I wanted to share how I've solved this especially given some constraints where using flow-type was not possible. In no way I'm saying this is the best way of doing it, but nonetheless I hope this helps.

1. You can check the constructor name:
   http://jsbin.com/liwiwomayu/edit?js,console

  const Foo = function () {};

  let foo = new Foo();

  console.log(foo.constructor.name);

I hope that is convincing enough, but you can actually find out if something is a GraphQLEnum, GraphQLList, GraphQLObjectType, etc, etc.

But I won't stop here!

Another interesting thing is you can see a graphql object's type config like this:

console.log(someGraphQLObject._typeConfig);

// That will actually output something very close to the code you wrote

// the type name:
console.log(myGqlObject._typeConfig.name);

You could always use typeof with a bunch of ampersands to do the trick as well. you could also try using instanceof as well but I think constructor.name is easier to use.

Another way is creating a special tag like graphType - in your database for every object and pass it into the Type Resolver function as well.

Hope this helps and honestly I'd love to see what others have done to solve this as well

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@MattMcFarland Thank you , im finding some way to do a static check.
In abstract concept,this problem is like this:
relayResolver <- (<-Graphql->) -> relayResolver, where Graphql is a black box. and relayResolver use a subset of Graphql's resolver. So theoretically, it should be a easy static check .
If in a static language ,it is,and should have a standard Template style to solve this. But with javascript, graphql's code separate source and args's type in many places.
I wonder if there is some inner technology like React's $ flow method to do this?
Or maybe i should use any type to make this part as a black-box of Graphql ? (seems its a bad idea).
there is a graphql-relay fork with flow-typed Graphql .

from graphql-relay-js.

any more work on this?

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Sorry for the late reply.
This issue is not specific to relay-style mutations and already discussed in the graphql-js repo.

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