ember-browserify is required for this to work.

[ShogunPanda]

Hi!
I tried on my app where I didn't have ember-browserify included and it failed when importing npm:date-fns/format.

I solved by embedding ember-browserify in my package.json, so apparently that is a required dependency.
Thanks!

[oskarrough]

Thanks. I'll add it to the installation instructions.

Would be great if it wasn't necessary to explicitly install it though...

[oskarrough]

Fixed by 052f506