schema: my-schema.graphql
generates:
  apollo-helpers.ts:
    plugins:
      - typescript-apollo-client-helpers

import { StrictTypedTypePolicies } from './apollo-helpers'
 
const typePolicies: StrictTypedTypePolicies = {
  // Keys in this object will be validated against the types on your schema
  Product: {
    keyFields: ['id'] // Values in this field will be validated against the available fields from the Product type
  },
  Person: {
    keyFields: ['name', 'email']
  },
  Book: {
    // This entire definition is typed, based on available types and fields
    fields: {
      tags: {
        merge: false
      }
    }
  }
}
 
const cache = new InMemoryCache({ typePolicies })