What is the 'Neural Link'?

The Neural Link is a bi-directional bridge that connects AI agents (like Gemini or Claude) directly to the Neo.mjs runtime. It allows agents to 'see' the application's Scene Graph, inspect component state, verify event listeners, and even mutate the running application in real-time. This turns the application into a 'glass box' for AI, enabling autonomous debugging and feature development.

Why is Neo.mjs called an 'Application Engine' instead of a framework?

Traditional frameworks are general-purpose libraries (like a Toyota) that help you organize code, but they compile away into ephemeral DOM nodes. Neo.mjs is a precision-engineered runtime (like an F1 car), similar to Unreal Engine for games. It maintains a persistent 'Scene Graph' of objects in a separate worker thread. These objects retain their identity, state, and relationships, allowing for advanced capabilities like multi-window orchestration, runtime permutation, and deep AI introspection that are impossible with 'melted plastic' DOM-based frameworks.

What is 'Context Engineering'?

Context Engineering is the practice of curating the environment and information flow for AI agents to maximize their autonomy. In Neo.mjs, this is implemented via three Model Context Protocol (MCP) servers: a Knowledge Base for semantic code understanding, a Memory Core for learning from past sessions, and a GitHub Workflow server for project management. This ecosystem allows agents to work as fully integrated members of the development team.

What is 'Object Permanence' in the context of Neo.mjs?

In Neo.mjs, UI components are persistent JavaScript objects living in the App Worker, not just transient rendering results. This 'Object Permanence' means a component (like a Dashboard) maintains its state (scroll position, user input, internal logic) even if it is detached from the DOM or moved to a different browser window. This is the 'Lego Technic' approach versus the 'Duplo' approach of traditional frameworks.

What is an 'Agent Operating System'?

Neo.mjs v11 introduced the concept of an Agent OS, where the platform itself provides the tools and interfaces for AI agents to operate. It combines a standalone, type-safe AI SDK for autonomous 'Code Execution' with the Neural Link for runtime control. This enables agents to monitor, debug, and heal the application autonomously, effectively acting as an operating system for synthetic intelligence.

How does Neo.mjs handle multi-window applications?

Neo.mjs uses shared web workers to run a single application instance across multiple browser windows. All windows share the same application state and data in real-time. Components can even move between windows while retaining their JavaScript instances. This enables desktop-class experiences like multi-window IDEs, browser-based email clients, and multi-screen control rooms.

What makes Neo.mjs different from React, Angular, or Vue?

Neo.mjs is fundamentally different in its architecture: (1) It uses True Multithreading via web workers to prevent UI jank, (2) It is an AI-Native Application Engine with built-in bridges for AI collaboration, and (3) It treats components as persistent objects in a Scene Graph, enabling native multi-window support and runtime permutation.

Frontmatter

id	8816
title	Fix Prototype Pollution in Unit Tests by Assigning Neo.setupClass
state	Closed
labels	bugtestingcore
assignees	tobiu
createdAt	Jan 19, 2026, 6:29 PM
updatedAt	Jan 19, 2026, 6:30 PM
githubUrl	https://github.com/neomjs/neo/issues/8816
author	tobiu
commentsCount	1
parentIssue	null
subIssues	[]
subIssuesCompleted	0
subIssuesTotal	0
blockedBy	[]
blocking	[]
closedAt	Jan 19, 2026, 6:30 PM

Fix Prototype Pollution in Unit Tests by Assigning Neo.setupClass

Name: Neo.mjs Application Engine
Author: Neo.mjs

Closed v11.23.0 bugtestingcore

tobiu commented on Jan 19, 2026, 6:29 PM

Multiple unit tests were calling Neo.setupClass(Class) without assigning the result back to the class variable. This causes prototype pollution because the original class constructor is modified in place (or its prototype is), but the enhanced class (returned by setupClass) is not used. This leads to unpredictable test interactions and failures, particularly TypeError: Neo.setupClass is not a function when subsequent tests rely on a clean state or when the class system enhancement logic is bypassed.

This fix applies the pattern Class = Neo.setupClass(Class) to all affected unit tests.

tobiu added the bug label on Jan 19, 2026, 6:29 PM

tobiu added the testing label on Jan 19, 2026, 6:29 PM

tobiu added the core label on Jan 19, 2026, 6:29 PM

tobiu referenced in commit 24a9051 - "fix: Prevent prototype pollution in unit tests by assigning Neo.setupClass result (#8816)" on Jan 19, 2026, 6:30 PM

tobiu assigned to @tobiu on Jan 19, 2026, 6:30 PM

tobiu Jan 19, 2026, 6:30 PM

Input from Gemini 3 Pro:

✦ I have applied the Class = Neo.setupClass(Class) pattern to all unit tests that were missing it. This ensures that the class system works correctly and prevents prototype pollution that was causing instability and cross-test contamination. Files updated:

test/playwright/unit/core/ClassConfigsAndFields.spec.mjs

test/playwright/unit/neo/MixinStaticConfig.spec.mjs

test/playwright/unit/state/Provider.spec.mjs

test/playwright/unit/vdom/AutoId.spec.mjs

This should resolve the TypeError: Neo.setupClass is not a function errors seen in CI.

tobiu closed this issue on Jan 19, 2026, 6:30 PM