How to write your first webpack plugin?

Checkout my medium post on "how to write your first webpack plugin?" at https://medium.com/@Uneducated/how-to-write-your-first-webpack-plugin-c5d6a175f2dc

Also you can check out this webpack plugin for reference that I wrote here https://github.com/HarshwardhanSingh/webpack-bundle-size-check-plugin.