test.js

const instance = new WebAssembly.Instance(wasmModule, {});
const { count } = instance.exports;

var limit = 50000;
var speed = 100;
var res = null;

for (i = 0; i < limit; i += speed) {
  try {
    res = count(i, 0);
  } catch (exc) {
    console.log("failed at limit ", i, " with ", exc);
    break;
  }
}

console.log("result ", res);

test.wat

(module
  	(func $count (export "count") (param $depth i32) (param $counter i32) (result i32) (local $one i32)
      i32.const 1
      local.set $one
      
      local.get $depth
      i32.const 0
      i32.eq
      
      if (result i32)
      	local.get $counter
      	return
      else
      	local.get $depth
      	local.get $one
      	i32.sub
      
      	local.get $counter
      	local.get $one
      	i32.add
      
      	call $count
      end
  )
)