This is a custom ApolloLink which we use to clean the "__typename" field to prevent sending it to the GraphQL server. omitDeep based on this gist: https://gist.github.com/Billy-/d94b65998501736bfe6521eadc1ab538

cleanTypenameFieldLink.ts

const cleanTypenameLink = new ApolloLink((operation, forward) => {
      if (operation.variables) {
        operation.variables = this.omitDeep (operation.variables, "__typename")
      }
      return forward(operation).map((data) => {
        return data;
      })
    })

private omitDeep(obj, key) {
    const keys = Object.keys(obj)
    const newObj = {}
    keys.forEach((i) => {
      if (i !== key) {
        const val = obj[i]
        if (Array.isArray(val)) newObj[i] = this.omitDeepArrayWalk(val, key)
        else if (typeof val === 'object' && val !== null) newObj[i] = this.omitDeep(val, key)
        else newObj[i] = val
      }
    })
    return newObj
  }

private omitDeepArrayWalk(arr, key) {
    return arr.map((val) => {
      if (Array.isArray(val)) return this.omitDeepArrayWalk(val, key)
      else if (typeof val === 'object') return this.omitDeep(val, key)
      return val
    })
  }