// @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 : '@@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 =
  // $FlowFixMe Flow doesn't define `Symbol.asyncIterator` yet
  typeof Symbol === 'function' ? Symbol.asyncIterator : '@@asyncIterator';

/* istanbul ignore next (See: https://github.com/graphql/graphql-js/issues/2317) */
export const SYMBOL_TO_STRING_TAG: string =
  // $FlowFixMe Flow doesn't define `Symbol.toStringTag` yet
  typeof Symbol === 'function' ? Symbol.toStringTag : '@@toStringTag';