Typescript
I was a relatively early adopter of Typescript, and an advocate of the clarity it carries into projects when implemented intelligently.
At Slite I aided in the transformation of a complex, large-scale javascript codebase to clean and well-ordered Typescript. This task was particularly challenging in that case, given the hybrid architecture of the Slite editor, containing a sprawling seris of layers & plugin-like features that are deployed in very different configurations & requirements across a number of varying target environments, from server-side document rendering to normalization for operational transform (OT), web client collaborative contexts, and even custom mobile variants.