NodeList.forEach drops an explicit null callback context
Nobody has claimed this yet.
Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 68/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Active
- Tech stack
- javascript, react-native
- Domain
- mobile-dev
Research direction
Start at the NodeList.forEach implementation and trace how null and undefined thisArg values are handled. Add or update coverage for an explicitly null callback context, then verify that strict callbacks receive null while omitted or undefined contexts retain the existing behavior.
Written by the indexing model from the issue text.
Description
Description
NodeList.forEach treats both null and undefined as the omitted thisArg fast path. An explicitly supplied null is therefore discarded, and a strict callback receives undefined instead of null, unlike standard Array and NodeList behavior.
Expected behavior
Only an omitted/undefined thisArg should use the unbound callback path. Explicit null should be forwarded as the callback receiver.
React Native Version
0.87.1 and current main
Affected Platforms
JavaScript runtime - All
- Dominant language
- C++
- Stars
- 127k
- Forks
- 25.3k
- PR merge metrics
- No merged PRs in 30d
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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