I am using a program called pico2wave to create an audio file.
This program can only write to a file and doesn’t support output to stdout.
I have created a symbolic link to /dev/stdout called pico2wave.wav.

I am attempting to replicate the behavior of the following shell command:

pico2wave -w pico2wave.wav test!

Which writes the output file to the pico2wave.wav symbolic link, outputting the resulting file to the stdout.

I have done the same in Node.JS, running the command in a child process but I don’t get any output on the standard output.

    const pico2wave = spawn("pico2wave", [
        '-w', `${path.join(__dirname, 'pico2wave.wav')}`,
        'test!',
    ], { 
        stdio: ['ignore', 'pipe', 'pipe']
    });

    pico2wave.stderr.on("data", (chunk) => {
        console.log(chunk.toString());
    });

    pico2wave.stdout.on('data', (data) => {
        console.log(data);
    })

Reading the documentation,

‘pipe’: Create a pipe between the child process and the parent process. The parent end of the pipe is exposed to the parent as a property on the child_process object as subprocess.stdio[fd]. Pipes created for fds 0, 1, and 2 are also available as subprocess.stdin, subprocess.stdout and subprocess.stderr, respectively. These are not actual Unix pipes and therefore the child process can not use them by their descriptor files, e.g. /dev/fd/2 or /dev/stdout.

it says, that the child process cannot use /dev/stdout, rendering my way of doing things flawed, is there a workaround to this issue?

I have also attempted to call pico2wave through the sh command, however it didn’t resolve the issue.