Spearmint

Spearmint is OS Labs' open-source tool for writing JavaScript tests without hand-writing the boilerplate: point it at a component or endpoint, describe the behavior, and it generates the test code. It isn't my project, but I helped build it: I was a core contributor through the OS Labs accelerator in 2021 and 2022. It has over a thousand GitHub stars.

My focus was making the app feel like a tool instead of a demo. I replaced heavyweight dependencies with lighter equivalents, which materially improved performance and cut the code editor's memory use by roughly 60 percent while keeping full terminal emulation. I also pushed TypeScript coverage through the React-Redux layer so action creators, reducers, and state got checked at compile time instead of exploding at runtime.

Accessibility was a founding concern of the project rather than a retrofit, which shaped how I think about interfaces to this day: keyboard paths and screen reader semantics are part of the feature.