Developer Rebuilds Browser-Based Tamagotchi in TypeScript, Gains Lessons in State Machines

A developer has recreated the classic 1990s Tamagotchi virtual pet as a browser-based app using TypeScript, with no dependencies, downloads, or app store required. The project replicates the original gameplay loop where a pixelated creature hatches from an egg and has four core needs — hunger, happiness, energy, and hygiene — that decay in real time every few seconds. A periodic game tick function drives state transitions and mood changes, while player actions like feeding, playing, and sleeping produce complex emergent behavior from simple inputs. The developer says building the project provided deeper practical insight into state machine architecture than conventional tutorials, which typically rely on simpler examples like traffic lights. The project was shared as open source and drew strong nostalgic reactions, with the developer noting that emotional resonance, not technical novelty, drove its reception.