What has the author Va lmi ki written?

The author you are referring to is Valmiki, not Va lmi ki. He is considered the author of the Ramayana, one of the two great epics of Hindu literature.

While the Ramayana is his most famous work, it's important to note:

* Authorship is debated: Some scholars believe Valmiki was a real person who compiled and composed the Ramayana, while others argue it evolved over time and had multiple contributors.

* Multiple versions exist: There are several versions of the Ramayana, with different details and variations. The most popular is the one attributed to Valmiki.

So, while Valmiki's name is synonymous with the Ramayana, the exact extent of his contribution and whether he was a single author are still debated among scholars.