Question: What does this line do in istanbuljs.github.io/webpack.config.babel.js

[mbkupfer]

Line 13 has export const makeConfig = (config = {}) => {

@bcoe , I know it is of context, but could you explain what this part of the code does?

As for the point of my question: I'm trying to learn and improve my javascript through examples and this project happened to catch my eye.