Handle no input from stdin()

[cannonrush]

I'm want to pipe the input directly into my script, but handle the case where the stdin is empty. My script:

// my-script.mjs
#!/usr/bin/env zx

import 'zx/globals';

const input = await stdin();
echo(input);

# this works
echo "my data" | ./my-script.mjs 

# this hangs indefinitely
./my-script.mjs

Is there any solution that zx provides, or do I have to use Promise.race?