CreateSchema

const {
    RenameTypes,
    transformSchema,
    introspectSchema,
    RenameRootFields,
    makeRemoteExecutableSchema
} = require('graphql-tools')
const fetch = require('node-fetch')
const { HttpLink } = require('apollo-link-http')

module.exports = async function ({
    api, // gridsome api
    prefix, // new schema prefix
    uri // graphql source url
}) {

    api.createSchema( async (graphql) => {

        const link = new HttpLink({
            uri,
            fetch,
            // headers: {}
        })

        const schema = await introspectSchema(link)

        const executableSchema = await makeRemoteExecutableSchema({ schema, link })

        const transformedSchema = transformSchema(
            executableSchema, [
                new RenameTypes( (type) => `${prefix}${type}` ),
                new RenameRootFields( (operation, name) => `${prefix}${name}` )
            ]
        )

        // schema to be created
        return transformedSchema
    })
}