Function getDataSourceAttributes

getDataSourceAttributes(dataSourceId): Promise<JAttribute[]>
JMap.Layer.getDataSourceAttributes

Returns attributes, for a given dataSource.
Parameters
- dataSourceId: JId
  the JMap dataSource id
Returns Promise<JAttribute[]>
Throws
if dataSourceId not valid or dataSource not found

Example
```
// Returns attributes, for dataSource id=3
JMap.Layer
 .getDataSourceAttributes(3)
```