Date-fns: Formatting completely broken

[duro]

I am running version 2.2.1, and look at the following output from the node REPL:

> const format = require('date-fns').format
undefined
> format(new Date(), 'EEEE')
'2222'
> format(new Date(), 'cccc LLLL do yyyy')
'cccc LLLL 2nd yyyy'
> format(new Date(), 'EEEE MMMM do YYYY')
'2222 September 2nd 2019'
> format(new Date(), 'EEEE MMMM do YYYY', { locale: 'en-US'})
'2222 September 2nd 2019'

Am I missing something totally from the docs, or what on earth could be causing this?

[duro]

So to add to this, if I start up a completely different project, and install date-fns, formatting works. So there must be some kind of conflict in my node_modules.

Does anyone have any idea what could cause this?

[fkabinoff]

I'm having the same issue. Works with v1 in my project, but I've tried 2.2.1 and 2.1.0 so far, and format doesn't work correctly in either.
format(0, 'dd') // should be 'Su', but is '31' instead.

[duro]

@fkabinoff I found my problem. Basically one of my other deps was installing an older version of date-fns, and there was a collision. I wiped my node_modules and re-installed, and now things are working as expected.