The design choices are centered around efficiency and compatibility with the standard JavaScript Date object, and browser bundling.
The Date object treats 0 as the first month of the year, and this library
accepts that convention. Because this can feel a little odd, references to months
usually specify monthIndex as a reminder.
The Date object treats 0 as Sunday, and this library accepts that convention.
This means functions like startOfWeek will return Sunday rather than Monday.
The addDays function has no complimentary subDays function, as this can
be achieved by making the days argument negative.
While classes might provide a more elegant interface, few tree shaking libraries and able to prune unused class methods, so functions are preferred to classes.
This may change, but the current view is that the majority of developers
use bundlers, rather than include manual <script> tags. With this in
mind the code is provided as a single javascript file, as the downstream
bundler will do the tree shaking.
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