What does fs.writeSync(1, "a string") mean in Node.js?

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From the docs: 

process.on('uncaughtException', (err) => {
  fs.writeSync(1, `Caught exception: ${err}\n`);
});

Is 1 the stdout stream? I've read the docs for fs.write and there's no discussion of how to use an integer in the first argument. The source code wasn't much help either.

I put this line 

(require('fs')).writeSync(1, `Starting...`);

into my code, thinking it would go to stdout but there was no output like that when I started my app. and it did output.

OK now that I see it did actually work (output to console): where is this documented though?

fs node.js
2 Answers
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