Repo brief: mobxjs/mobx

Generated by RepoPilot · document generated 2026-09-16 · concise human review Evidence snapshot · analyzed 2026-09-16T01:49:45.437Z · commit 53bb83fdf455

Verdict

Healthy — Healthy across all four use cases

• Last commit 2d ago
• 21+ active contributors
• Distributed ownership (top contributor 34% of recent commits)
• MIT licensed
• 2 more receipts on the live page

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests, cross-checked against dependency CVEs from deps.dev and OpenSSF Scorecard

What it is

MobX is a lightweight, reactive state management library for JavaScript/TypeScript that automatically tracks observable data changes and triggers re-renders when state updates occur. It simplifies complex application state by using decorators and annotations (action, computed, observable) to declare what state is reactive, eliminating boilerplate compared to Redux or Zustand. Core capability: automatic dependency tracking and change propagation without explicit subscription management. Monorepo with 5 packages under /packages: mobx (core engine ~1.1M LoC TypeScript), mobx-react, mobx-react-lite (React bindings), eslint-plugin-mobx, and mobx-undecorate. Core engine organized into…

Start here

Open these first:

• packages/mobx/src/mobx.ts — Main entry point exporting all public MobX APIs and the primary interface developers use.
• packages/mobx/src/core/globalstate.ts — Manages global reaction tracking and derivation state that underpins all reactive updates.
• packages/mobx/src/core/derivation.ts — Core abstraction for computed values and reactions that implements MobX's dependency tracking.
• packages/mobx/src/api/makeObservable.ts — Primary decorator/annotation API that converts objects into observable state containers.
• packages/mobx/src/types/observableobject.ts — Implementation of observable object wrapping and property interception.

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

git clone https://github.com/mobxjs/mobx.git
cd mobx
npm install
npm run build
npm test

Daily commands:

For core development: npm run build (builds all workspaces), npm run test (runs Jest suite), npm run lint (ESLint check), npm run mobx <script> (run mobx package-specific script). Website docs available via `npm…

…shortened for this brief.

Key cautions & unknowns

• No explicit environment variables detected. TypeScript 5.9.2+ required (pinned in overrides). Decorator support depends on @babel/plugin-proposal-class-properties being configured for class-based observable syntax.…
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests
• OpenSSF Scorecard

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

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