Function warning

warning(message, options?): void
JMap.Application.Message.warning

Adds an warning message in the application message stack for the current session.
Parameters
- message: string
  the text of the message
- Optional options: JAppMessageOptions
  a JAppMessageOptions object
Returns void
Example
```
const message = "This operation has no effect"
JMap.Application.Message.warning(message, { duration: 5000 })
```