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https://issues.apache.org/jira/browse/ARROW-4442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661464#comment-17661464
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Rok Mihevc commented on ARROW-4442:
-----------------------------------
This issue has been migrated to [issue
#21001|https://github.com/apache/arrow/issues/21001] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [JS] Overly broad type annotation for Chunked typeId leading to type
> mismatches in generated typing
> ---------------------------------------------------------------------------------------------------
>
> Key: ARROW-4442
> URL: https://issues.apache.org/jira/browse/ARROW-4442
> Project: Apache Arrow
> Issue Type: Improvement
> Components: JavaScript
> Affects Versions: 0.4.0
> Reporter: Paul Taylor
> Assignee: Paul Taylor
> Priority: Minor
> Labels: pull-request-available
> Fix For: 0.13.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Typescript is generating an overly broad type for the `typeId` property of
> the ChunkedVector class, leading to a type mismatch and failure to infer
> Column<T> is Vector<T>:
> {code:actionscript}
> let col: Vector<Utf8>;
> col = new Chunked(new Utf8());
> ^
> /*
> Argument of type 'Chunked<Utf8>' is not assignable to parameter of type
> 'Vector<Utf8>'.
> Type 'Chunked<Utf8>' is not assignable to type 'Vector<Utf8>'.
> Types of property 'typeId' are incompatible.
> Type 'Type' is not assignable to type 'Type.Utf8'.
> */
> {code}
> The fix is to add an explicit return annotation to the Chunked typeId getter.
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