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	9433
title	TreeStore: Implement bulk expandAll() and collapseAll() methods
state	Closed
labels	enhancementaiarchitecturegrid
assignees	tobiu
createdAt	Mar 10, 2026, 3:26 PM
updatedAt	Mar 11, 2026, 10:55 AM
githubUrl	https://github.com/neomjs/neo/issues/9433
author	tobiu
commentsCount	1
parentIssue	9404
subIssues	[]
subIssuesCompleted	0
subIssuesTotal	0
blockedBy	[]
blocking	[]
closedAt	Mar 11, 2026, 10:55 AM

TreeStore: Implement bulk expandAll() and collapseAll() methods

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

Closed v12.1.0 enhancementaiarchitecturegrid

tobiu commented on Mar 10, 2026, 3:26 PM

Goal

Provide expandAll() and collapseAll() methods to toggle the entire tree state efficiently without locking the UI thread.

Context

Currently, TreeStore only supports toggling individual nodes via expand(nodeId) and collapse(nodeId). Each call triggers a localized recalculation of the visible projection (_items) and a UI update. If a user needs to expand a deeply nested tree with 5,000 nodes, doing so in a loop would cause 5,000 recalculations, freezing the App Worker.

Acceptance Criteria

Implement expandAll() and collapseAll() in TreeStore.mjs.
These methods should iterate through the internal #allRecordsMap and flip the collapsed boolean on every node (silently, without triggering individual events if possible).
After the bulk state change, the flat _items projection must be rebuilt once from the roots.
Fire a single mutate or refresh event to update the UI.
Write a unit test in TreeStore.spec.mjs to verify bulk expanding/collapsing on a deep hierarchy.

tobiu added the enhancement label on Mar 10, 2026, 3:26 PM

tobiu added the ai label on Mar 10, 2026, 3:26 PM

tobiu added the architecture label on Mar 10, 2026, 3:26 PM

tobiu added the grid label on Mar 10, 2026, 3:26 PM

tobiu added parent issue #9404 on Mar 10, 2026, 3:27 PM

tobiu assigned to @tobiu on Mar 10, 2026, 3:29 PM

tobiu referenced in commit 219f084 - "feat(data.TreeStore): Implement bulk expandAll() and collapseAll() methods (#9433)" on Mar 11, 2026, 10:54 AM

tobiu Mar 11, 2026, 10:54 AM

Input from Gemini 3.1 Pro:

✦ The bulk expandAll() and collapseAll() methods have been implemented in TreeStore.mjs according to the acceptance criteria.

Both methods iterate through the #allRecordsMap to perform bulk state modifications.

They handle both Neo.data.Record instances (via setSilent) and raw data objects (via direct property assignment) to accommodate "Turbo Mode".

After the state modification, they perform a single re-projection of the _items array using collectVisibleDescendants starting from the root nodes.

Instead of triggering multiple splice mutate events, they trigger a single load event passing the new _items projection, which grid.Container and other views already listen to for complete refreshes.

Unit tests have been added to test/playwright/unit/data/TreeStore.spec.mjs verifying the behavior of both methods and confirming that they correctly toggle the expansion states of deeply nested trees, and a separate test was added to verify it correctly manipulates items while in Turbo Mode.

The code is committed and pushed to the repository. I'll close this ticket now.

tobiu closed this issue on Mar 11, 2026, 10:55 AM