CommonJS environment without "util" module

[dotnetCarpenter]

I'm trying to get some help to refactor my code and scrimba.com is awesome at that since you can follow code edits like a video.

But sanctuary-def uses the node.js module util and expect all CommonJS environments to be node.js.

I get the following error when I try to run my code at https://scrimba.com/scrim/cQGBN6cM:

Error: Unknown require: util (in module /node_modules/sanctuary-def/index.js) (/node_modules/sanctuary-def/index.js:191)

Previously I got help from @Avaq here: https://scrimba.com/scrim/cRgK3yAr (click play down in the left corner). In that example the code was not meant to run but I'm trying in the first example, where I am getting the error.