The WordPress Widget Boilerplate serves as a foundation off of which to build your WordPress widgets using modern tools such as Composer and an object-oriented approach all of which is documented in this series of posts.
The WordPress Widget Boilerplate is ready to activate as-is (and it includes a sample widget with a title, content, and checkbox).
wordpress-widget-boilerplate
directory into your wp-content/plugins
directoryThe purpose of having a working widget is to give you an idea as to where certain things belong. Further, the idea is to fork the existing code and make it your own for your own project.
It's organized in such a way that lends itself to unit testing, a higher level of cohesion, a lower level of coupling. It also uses features of the object-oriented paradigm to provide better organization of code base and features of PHP such as namespaces and type hinting.
The WordPress Widget Boilerplate was originally started and is maintained by Tom McFarlin.
The project is open-source and receives contributions from awesome WordPress Developers throughout the world.