Apollo-server: Apollo Server 2.0 RC and typeDefs from external file

[stephanerotureau]

Hello,

I'm currently migrating my Apollo server to v2.0 and I'm encounter an issue when trying to import typeDefs from another file.
Following the documentation (https://www.apollographql.com/docs/apollo-server/v2/migration-two-dot.html#gql-tag), it seems I need to write:

const typeDefs = gql${IMPORT_FUNCTION('./schema-file')};
or
const typeDefs = gql(IMPORT_FUNCTION('./schema-file'))

But it doesn't work, it seems to not recognize the IMPORT_FUNCTION.
Is the syntax correct? or IMPORT_FUNCTION should be replaced by something else? What should be the content of the schema_file to work correctly?

Maybe the documentation should be clearer on this point.
Thanks.

Stéphane

[evans]

Totally, the documentation could use some work. Import function isn't the best example. https://github.com/apollographql/apollo-server/pull/1210 will include the doc additions. You can check it out for now to see a code snippet

[stephanerotureau]

Thanks @evans :smiley:

[evans]

@stephanerotureau We've updated the docs and fixed the typeDefs. Thank you for flagging the issue!

[BRoy98]

Is it possible to declare types in different files (like models) for better modularity? Like...

book.js

type Book {
    title: String
    author: String
  }

author.js

type Author {
    name: String
    dob: String
  }

[leocavalcante]

@BRoy98 glob.sync + fs.readFileSync + Array.prototype.reduce would do the trick.

• glob gives you all the files that matches a pattern like *.graphql or ./**/*.gql.
• Read those files regularly using readFile[Sync]
• You still end up with a list of type definition strings, but reduce them to a single just but concatenation.

Pseudo-code, I haven't tested it, just writing it while I write the comment:

const typeDefs = gql`${glob.sync(__dirname.concat('*.graphql'))
  .map(filename => fs.readFileSync(filename, 'utf8))
  .reduce((typeDefs, typeDef) => `${typeDefs}\n${typeDef}`, '# My Awesome SDL')}`

Not sure if special chars like \n works with template strings and you should tweak glob pattern to your file structure.