Using the forever module of nodejs, no related files are generated after adding-o

as mentioned, I tried to use forever to manage some js scripts on my local (MacBook15, system 10.13.3) and server (CentOS 7), but I found that no new files were ever generated.

for example, there is a test.js:

here.

console.log("begin test..")

setInterval(()=>{
    console.log(Date.now(), ":test point...")
},10000)

then forever start test.js-o test.log my understanding is that a test.log log file will be generated in this directory to record console.log information, but it doesn"t.

so I would like to ask you, is it my wrong understanding of the usage, or is there something wrong with the way I use it?