A bit old now of course but both Underscore [1] and Backbone [2] have annotated sources and are a pleasure to read. 1. https://underscorejs.org/docs/underscore

A bit old now of course but both Underscore [1] and Backbone [2] have annotated sources and are a pleasure to read. 1. https://underscorejs.org/docs/underscore-esm.html https://underscorejs.org/docs/underscore-esm.html 2. https://backbonejs.org/docs/backbone.html https://backbonejs.org/docs/backbone.html