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+// @flow strict
+// In ES2015 (or a polyfilled) environment, this will be Symbol.iterator
+// istanbul ignore next (See: 'https://github.com/graphql/graphql-js/issues/2317')
+export const SYMBOL_ITERATOR: string =
+ typeof Symbol === 'function' && Symbol.iterator != null
+ ? Symbol.iterator
+ : '@@iterator';
+
+// In ES2017 (or a polyfilled) environment, this will be Symbol.asyncIterator
+// istanbul ignore next (See: 'https://github.com/graphql/graphql-js/issues/2317')
+export const SYMBOL_ASYNC_ITERATOR: string =
+ typeof Symbol === 'function' && Symbol.asyncIterator != null
+ ? Symbol.asyncIterator
+ : '@@asyncIterator';
+
+// istanbul ignore next (See: 'https://github.com/graphql/graphql-js/issues/2317')
+export const SYMBOL_TO_STRING_TAG: string =
+ typeof Symbol === 'function' && Symbol.toStringTag != null
+ ? Symbol.toStringTag
+ : '@@toStringTag';