8000 Iterator helpers missing · Issue #1684 · facebook/hermes · GitHub
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Iterator helpers missing #1684

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dlindenkreuz opened this issue Apr 23, 2025 · 1 comment
Open
2 tasks done

Iterator helpers missing #1684

dlindenkreuz opened this issue Apr 23, 2025 · 1 comment
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enhancement New feature or request

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@dlindenkreuz
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Bug Description

Iterator Helpers have been added to WebKit / JSC recently. They are available in Safari >= 18.4. Hermes does not support them yet.

I ran into this by accident because TypeScript's ECMA support already suggests helper methods on iterators.

  • I have run gradle clean and confirmed this bug does not occur with JSC
  • The issue is reproducible with the latest version of React Native.

Hermes git revision (if applicable): rn/0.79-stable
React Native version: 0.79
OS: macOS 14.7.2
Platform (most likely one of arm64-v8a, armeabi-v7a, x86, x86_64): arm64

Steps To Reproduce

One-liner:

new Map([["a", 1], ["b", 2]]).values().map(v => v * 2)
// Uncaught TypeError: new Map([["a", 1], ["b", 2]]).values().map is not a function (it is undefined)

The Expected Behavior

Should not throw and instead return a new iterator. The code above works in Safari 18.4 console.
@dlindenkreuz dlindenkreuz added the bug Something isn't working label Apr 23, 2025
@avp
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avp commented Apr 23, 2025

Thanks for the report, we're working on implementing this feature.

@avp avp added enhancement New feature or request and removed bug Something isn't working labels Apr 23, 2025
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