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Added check for specific symbols in polyfills/symbols #2804

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Merged
merged 2 commits into from
Sep 20, 2020
Merged

Added check for specific symbols in polyfills/symbols #2804

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abcc4b0
fix: Added check for specific symbols in polyfills/symbols
dionisnote Sep 18, 2020
007f17e
review fixes
IvanGoncharov Sep 20, 2020
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12 changes: 9 additions & 3 deletions src/polyfills/symbols.js
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Original file line number Diff line number Diff line change
@@ -1,13 +1,19 @@
// 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';
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 : '@@asyncIterator';
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 : '@@toStringTag';
typeof Symbol === 'function' && Symbol.toStringTag != null
? Symbol.toStringTag
: '@@toStringTag';