How does the --export flag work?

I cannot find docs about exactly how to use it.

I tried with a file that exports a schema like this:

schema.ts

import gql from "graphql-tag";

export const schema = gql`
  type User {
    id: ID!
    first_name: String!
    last_name: String!
  }
`

And I run this:

gql-gen --export schema.js --template typescript --out ./types.ts ./src/**/*.ts

And I get this error:

Loading GraphQL Introspection from JavaScript ES6 export: schema.js...
TypeError: schema.getTypeMap is not a function

[dotansimha]

@GD-Aichi soon 😃 @jonaskello please read my latest comment in the PR.

[GD-Aichi]

Is this review finish?