how to check shell command if exists?

I want to check shell command if exists with deno but there is no way?

In my mind is bellow.
```ts
if (executable("vim")) { // do something }
```

I try to found functions but I couldn't found it form modules.

https://deno.land/std@0.96.0/path
https://deno.land/std@0.96.0/fs