An Apollo Link for setting an auth token header.

apollo-link-token.mjs

import { ApolloLink } from 'apollo-link'

const createTokenLink = ({ getToken }) =>
  new ApolloLink((operation, forward) => {
    const token = getToken()
    if (token)
      operation.setContext({
        headers: {
          authorization: `Bearer ${token}`
        }
      })
    return forward(operation)
  })

export default createTokenLink