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docs: clarify when index property in ViewToken can be null - #5272
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supunyasanthaofficial wants to merge 1 commit into
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Fixes #3637
Summary
Updates the
ViewTokendocumentation to explain why theindexproperty is optional.The
indexcan benullwhen the viewable element is not a regular item from the data array. For example, this can happen when a section header or footer becomes viewable in aSectionList.The same update has also been backported to the versioned docs for 0.77 through 0.87.
Test Plan
npx eslint docs/viewtoken.md website/versioned_docs/*/viewtoken.mdyarn --cwd website docusaurus build