Configurable `gql` import

[danielkcz]

Is your feature request related to a problem? Please describe.
It's pretty much a recommended way to use graphql.macro for loading graphql files or inlining documents. Since CRA2.0 has babel-plugin-macros includes it's a fairly cheap optimization of runtime code.

Describe the solution you'd like
Add configuration option gqlImportFrom to specify where to find gql.

Describe alternatives you've considered
Perhaps a boolean flag directly for a macro variant?

[IanVS]

I think this shouldn't be a Boolean. It would be great if it's flexible, to support other import locations, like Gatsby: #1321

[dotansimha]

Fixed in graphql-tag-pluck & graphql-toolkit by @kamilkisiela . PR here: #1370

[kamilkisiela]

@dotansimha It's not exactly the same. I made graphql-tag-pluck to support any kind of package, either with default or named export but we don't have a way to define those packages in graphql-code-generator through codegen.yml.

By default we use the default export from graphql-tag package and graphql from gatsby.

[kamilkisiela]

@dotansimha #1376 should enable that

[kamilkisiela]

More on that here https://github.com/DAB0mB/graphql-tag-pluck#options

[dotansimha]

Available in 0.18.0 🎉