GraphQL WebSocket Files

Patch Changes

• #680 3fdd82f Thanks @kkhys! - Disposing of a client event listener twice no longer removes an unrelated listener

  The unsubscribe function returned by client.on spliced at indexOf(listener) without checking for -1, so removing an already-removed listener would splice(-1, 1) and silently drop the most recently registered listener of the same event. This happens in practice without any double-dispose by the user: emits iterate over a copy of the listeners, so a one-shot internal listener that already unlistened itself during a nested emit (e.g. when client.terminate() is called from within a closed/error listener) is re-invoked from the copy and unlistens again, knocking out registered closed/error listeners.