Using stream on non-nullable lists

[saihaj]

type NestedObject {
  nullableSlow: [String]
  nonNullableSlow: [String]!
}

type Query {
  nested: NestedObject
}

If I try to @stream nullableSlow it will work but when trying on nonNullableSlow I get the following error:

{
  "errors": [
    {
      "message": "Stream directive cannot be used on non-list field \"nonNullableSlow\" on type \"NestedObject\".",
      "locations": [
        {
          "line": 3,
          "column": 21
        }
      ]
    }
  ]
}

Here is a codesandbox: https://codesandbox.io/s/stream-error-non-null-list-ntgem?file=/src/index.mjs

[robrichard]

@saihaj the validation rule StreamDirectiveOnListFieldRule was not properly checking non-null wrapping types. This is fixed now on the defer-stream branch