Relay Compiler: Syntax error when compiling schemas with multiple inheritance

[cousine]

Given the following schema:

interface Invitable {
  avatar_url: String
  email: String
  github_nickname: String
  id: ID!
  name: String
}

interface Node {
  # ID of the object.
  id: ID!
}

type Student implements Node, Invitable {
  avatar_url: String
  email: String
  github_nickname: String
  id: ID!
  name: String
}

type Teacher implements Node, Invitable {
  avatar_url: String
  email: String
  github_nickname: String
  id: ID!
  name: String
}

Relay compiler would throw a syntax error Unexpected name Invitable, however, if I replace the , with & the schema would compile:

interface Invitable {
  avatar_url: String
  email: String
  github_nickname: String
  id: ID!
  name: String
}

interface Node {
  # ID of the object.
  id: ID!
}

type Student implements Node & Invitable {
  avatar_url: String
  email: String
  github_nickname: String
  id: ID!
  name: String
}

type Teacher implements Node & Invitable {
  avatar_url: String
  email: String
  github_nickname: String
  id: ID!
  name: String
}

Same issue can also be found here: https://stackoverflow.com/questions/49198778/relay-compiler-cannot-compile-graph-cool-graphql-schemas-with-multiple-inheritan

Info:

node@8.0.0
npm@5.6.0
relay-compiler@1.5.0
Schema auto generated via get-graphql-schema@2.1.1

[alloy]

This is due to a change in the SDL spec that was implemented in graphql-js v0.13. While graphql-js can technically accept an option to enable legacy parsing, it is not exposed in relay-compiler.

The simplest way to make this work would be to make get-graphql-schema work with graphql-js v0.13, possibly by using e.g. yarn’s resolutions feature: https://yarnpkg.com/lang/en/docs/selective-version-resolutions/