Graphql-code-generator: Update programatic usage documentation

[dotansimha]

As discussed here: https://github.com/dotansimha/graphql-code-generator/issues/1503#issuecomment-474872791

[dotansimha]

Fixed in: https://github.com/dotansimha/graphql-code-generator/commit/31ed540b62d3e26dbb67330aefd520013d95bf73

[dotansimha]

Fix available in 1.0.2.

[dimitar-nikovski]

Hi, firstly many thanks for all your great work.

The schema type for the config in the programatic usage docs is required to be a DocumentNode by the referenced implementation, however in the example in the docs it's the result of buildSchema which returns a GraphQLSchema.

I couldn't find a way to negotiate these two types and derive a DocumentNode from my GraphQLSchema. Any advice much appreciated.

[dotansimha]

@dimitar-nikovski my bad, just use printSchema over the GraphQLSchema you are getting from buildSchema. Or, you can use parse (from graphql).

[dimitar-nikovski]

Thanks, I did parse(printSchema(schema)). Happy to put forward some edits of that page in a PR.

[dotansimha]

@dimitar-nikovski go for it!