GitHub - mobxjs/mobx-state-tree: Full-featured reactive state management without the boilerplate

Technically speaking, mobx-state-tree (also known as MST) is a state container system built on MobX, a functional reactive state library. This may not mean much to you, and that’s okay. I’ll explain it like this: MobX is a state management "engine", and MobX-State-Tree gives it structure and common tools you need for your app. MST is valuable in a large team but also useful in smaller applications

[teppeis]

ビルダーによるランタイムバリデーションとTypeScript型生成

[efcl]

mobxのmutate + snapshotなstate管理ライブラリ