In the latest version of Jade, partial is deprecated.
Code using partial won’t render
extends layout
block content
h1 Invoices:
!= partial("invoice")
Jade newest version doesn't support partials. You might be following outdated tutorials. Please read up on jade documentation here
Since you can’t use partial, let’s use mixin instead.
・node.js - Partial Not Defined in Jade - Stack Overflow
That’s all from the Gemba.