// those 2 abstract of the same library are supposed to do the exact same thing, but are written totally differently
// because no one cared about restricting the way you should use their public API.
// because there's no real public API, because JS.

const hasSubscriptionOperation = ({ query: { definitions } }) => {
  return definitions.some(
    ({ kind, operation }) =>
      kind === 'OperationDefinition' && operation === 'subscription'
  )
}

// VS

import { getMainDefinition } from 'apollo-utilities';
const subscription = ({ query }) => {
    const { kind, operation } = getMainDefinition(query);
    return kind === 'OperationDefinition' && operation === 'subscription';
  }