I use this milliseconds package frequently like this,

import msfrom from 'milliseconds';

// ...later
await setTimeout( msfrom.seconds( 30 ) )

This package helps me to work with others who use units of time other than milliseconds. I don't create "custom code" that would annoy those people but instead import this package. Thank you :)

would you consider doing this :

ms.years(2)  // ms instance
  .months(6) // ms instance
  .valueOf() // 78894000000

?

This library is great! The only thing I find myself missing is a milliseconds.toSeconds function that I could use to:

• Convert a JS timestamp (milliseconds since epoch) into a unix timestamp (seconds since epoch)
• Pass values to third-party-library functions which expect seconds instead of milliseconds.

// example usage
console.log({
  'a unix timestamp': milliseconds.toSeconds(Date.now()),
  'do this in 15 minutes': milliseconds.toSeconds(milliseconds.minutes(15)),
});

This function compliments this library nicely but is so small that it doesn't really warrant its own library. What do you think? Is it related enough to "mess with perfection" and add it to this library?