where can I find the file which created by emscipten ?

[Wanghb Wang]

I learn from the website 
https://kripken.github.io/emscripten-site/docs/api_reference/Filesystem-API.html
. 
I use the followed code to create a file, However, I cannot find the file. 
Where is it?
  EM_ASM(
                FS.mkdir('/IDBFS');
                FS.mount(IDBFS,{},'/IDBFS');
                FS.syncfs(true, function(err){
                        assert(!err);

open("/IDBFS/moar.txt", "r+");
        //      fopen("/IDBFS/test.test.pcm","wb");
});
);


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