Developer accidentally builds programming language Seseragi while fixing everyday coding frustrations

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Software developer Kentaro Morishita has created an experimental programming language called Seseragi, named after the Japanese word for the gentle sound of a stream. The project was not planned — it grew organically from years of small frustrations with writing web applications in TypeScript, particularly around control flow and conditional expressions. Along the way, Morishita built a TypeScript library called F-Box to explore functional programming concepts like monads, but eventually concluded that a library alone could not address the deeper syntactic and semantic limitations he wanted to overcome. Seseragi already includes a Rust-based compiler, CLI, LSP, formatter, a WASM playground, and a Web UI, despite still being in a pre-release experimental stage. The project is publicly available on GitHub and through a dedicated website with an interactive tour.

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