Support string descriptors for `generate`

[andykenward]

When running

apollo-codegen generate **/*.graphql --schema schema.json --target typescript --addTypename --output operation-result-types.ts

If there are string descriptors in a .graphql files

"this is my comment"

Then an error is thrown of

Unexpected String "this is my comment"

See

• Seems the descriptions are broken again Swydo/meteor-graphql#12 (comment)

• RFC: Descriptions as strings. graphql/graphql-js#927

[andykenward]

Even with having "graphql": "^0.12.3", as a dependency in my project it was still using an older version.

I've managed to get it to use a newer version of graphql.

Using yarn ^1.3.2 and adding to my projects package.json

  "resolutions": {
    "graphql": "^0.12.3"
  }

[martijnwalraven]

This should be fixed in apollo-codegen 0.18.3.