For Typescript and probably PHP, the command to **Show call hierarchy** exists.
Additionally there are extensions in the marketplace that will provide a visual representation of the function call hierarchy. For example, the **AtomicViz** extension available [here][1] [![enter image description here][2]][2]

[1]: https://marketplace.visualstudio.com/items?itemName=AtomicConcepts.atomicviz [2]: https://i.sstatic.net/Ib5yEgWk.png

For Typescript, and I believe many languages now, the command to **Show call hierarchy** exists.
Additionally there are extensions in the marketplace that will provide a visual representation of the function call hierarchy. For example, the **AtomicViz** extension available [here][1].
[![AtomicViz extension][2]][2]

[1]: https://marketplace.visualstudio.com/items?itemName=AtomicConcepts.atomicviz [2]: https://i.sstatic.net/oNOF3MA4.png