Type Alias Interval

Interval:
| number
| { hours?: number; millis?: number; mins?: number; secs?: number }

Interval types allows for more expressive coding, rather than embedding millisecond values.

That is, we can use { mins: 5 } to mean 5 minutes rather than 5*60*1000 or worse, 300000, for the same value.

{ hours: 1 };  // 1 hour
{ mins: 5 };   // 5 mins
{ secs: 5 };   // 5 secs
{ millis: 5 }; // 5 milliseconds

If several fields are used, this sums their value

{ secs: 2, millis: 1 }; // equal 2001 milliseconds.

Wherever ixfx takes an Interval, you can also just provide a number instead. This will be taken as a millisecond value.