Paul Taylor created ARROW-4442:
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Summary: [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
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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