Added check for specific symbols in polyfills/symbols #2804
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Added check for specific symbols in polyfills/symbols because in nodejs 8 Symbol exists, but Symbol.asyncIterator is not.
This cause an error
message: "Subscription field must return Async Iterable. Received: { next: [function next], return: [function return], throw: [function throw], @@asyncIterator: [function] }."
just because
isAsyncIterable
returns falseChecking for specific symbols in Symbol will fix it