op to give number of open "resources"

[ry]

Resources (AKA rid) are Deno's version of file descriptors. They are integer values used to refer to open files, sockets, and other concepts. For testing it would be good to be able to query the system for how many open resources there are.

The table that holds them is here:

deno/src/resources.rs

Line 41 in 8b39d2c

static ref RESOURCE_TABLE: Mutex<ResourceTable> = Mutex::new({

Maybe call this deno.numResources()

Alternatively we could have deno.resources() which returns a list of different open resources and their ids. It might look like this [ [0, "stdin"], [1, "stdout"], [2, "stderr"], [7, "httpBody"] ]

[bartlomieju]

I'll do it

[ry]

landed in 946acbc