agam opened a new issue #12663:
URL: https://github.com/apache/arrow/issues/12663
While there are several _versions_ that are Javascript-compatible, the "pure
Typescript" version fails to type check.
- It is possible to use specific versions, e.g. `@apache-arrow/es2015-umd`.
- It is also possible to use the "umbrella" import `apache-arrow`.
- However, the `@apache-arrow/ts` import fails to type check with `tsc`.
A sample of errors from one file:
```
../../node_modules/@apache-arrow/ts/schema.ts:46:49 - error TS2345: Argument
of type '(Field<T[keyof T]> | undefined)[]' is not assignable to parameter of
type 'Field<any>[]'.
Type 'Field<T[keyof T]> | undefined' is not assignable to type
'Field<any>'.
Type 'undefined' is not assignable to type 'Field<any>'.
46 return new Schema<{ [key: string]: K }>(columnIndices.map((i) =>
this.fields[i]).filter(Boolean), this.metadata);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../node_modules/@apache-arrow/ts/schema.ts:64:58 - error TS2532: Object
is possibly 'undefined'.
64 metadata: mergeMaps(mergeMaps(new Map(),
curFields[i].metadata), f2.metadata)
~~~~~~~~~~~~
../../node_modules/@apache-arrow/ts/schema.ts:129:22 - error TS2532: Object
is possibly 'undefined'.
129 const type = field.type;
~~~~~
```
(Is there any plan to have the typescript code eventually type-check with
`tsc` ?)
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