Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.

A perspective on how to balance testing.

Simple standard for testing and reporting results.

Focuses mostly on react, but goes through a GoF-like patterns updated for webdev.

signals, jerry.

CHAOSS is a Linux Foundation project focused on creating analytics and metrics to help define community health

TS Pull Request outlining why methods are not strictly checked: "The stricter checking applies to all function types, except those originating in method or construcor declarations. Methods are excluded specifically to ensure generic classes and interfaces (such as Array<T>) continue to mostly relate covariantly."

Good explanation of covariance and contravariance in TS.