Quick script to get a GraphQL schema file for Content Models from Prismic.io graphql endpoint.

get_prismicio_schema.js

const { buildClientSchema, printSchema } = require("graphql");
const fs = require("fs");

const { PrismicLink } = require('apollo-link-prismic');
const { gql, ApolloClient, InMemoryCache } = require("apollo-boost");

const prismicReposistory = "<prismic.io repository name>"
const accessToken = "<access token from the repo API settings page"
const ouputFile = "./prismic.graphql"

const apolloClient = new ApolloClient({
  link: PrismicLink({
    uri: `https://${prismicReposistory}.prismic.io/graphql`,
    accessToken: accessToken,
  }),
  cache: new InMemoryCache()
});

// Query taken from Insomnia API client
const introspectionQuery = gql`
query IntrospectionQuery {
  __schema {
    queryType { name }
    mutationType { name }
    subscriptionType { name }
    types {
      ...FullType
    }
    directives {
      name
      description
      locations
      args {
        ...InputValue
      }
    }
  }
}
fragment FullType on __Type {
  kind
  name
  description
  fields(includeDeprecated: true) {
    name
    description
    args {
      ...InputValue
    }
    type {
      ...TypeRef
    }
    isDeprecated
    deprecationReason
  }
  inputFields {
    ...InputValue
  }
  interfaces {
    ...TypeRef
  }
  enumValues(includeDeprecated: true) {
    name
    description
    isDeprecated
    deprecationReason
  }
  possibleTypes {
    ...TypeRef
  }
}
fragment InputValue on __InputValue {
  name
  description
  type { ...TypeRef }
  defaultValue
}
fragment TypeRef on __Type {
  kind
  name
  ofType {
    kind
    name
    ofType {
      kind
      name
      ofType {
        kind
        name
        ofType {
          kind
          name
          ofType {
            kind
            name
            ofType {
              kind
              name
              ofType {
                kind
                name
              }
            }
          }
        }
      }
    }
  }
}`


apolloClient.query({query:introspectionQuery}).then(({data}) => {
  const graphqlSchemaObj = buildClientSchema(data);
  const sdlString = printSchema(graphqlSchemaObj);

  fs.writeFile(ouputFile, sdlString, function(err) {
      if(err) {
          return console.log(err);
      }
      console.log("The file was saved!");
  });
}).catch(error => {
  console.error(error);
})

OMG thank you so much!!!