---
id: 8806
title: 'Docs: Create ''Async Destruction & The Trap Pattern'' Guide'
state: CLOSED
labels:
  - documentation
  - enhancement
  - ai
assignees:
  - tobiu
createdAt: '2026-01-19T11:21:59Z'
updatedAt: '2026-01-19T11:29:40Z'
githubUrl: 'https://github.com/neomjs/neo/issues/8806'
author: tobiu
commentsCount: 1
parentIssue: null
subIssues: []
subIssuesCompleted: 0
subIssuesTotal: 0
blockedBy: []
blocking: []
closedAt: '2026-01-19T11:29:40Z'
---
# Docs: Create 'Async Destruction & The Trap Pattern' Guide

**Goal:** Create a comprehensive guide on "Async Destruction & The Trap Pattern".

**Reasoning:**
Asynchronous operations (fetch, XHR, dynamic imports) in UI components pose a risk if the component is destroyed before the operation completes. Accessing `this` or calling methods on a destroyed component leads to runtime errors and memory leaks. The framework provides `trap()` as a robust solution, but it is not widely documented outside of JSDoc.

**Content:**
1.  **The Problem:** Explaining "zombie" callbacks and potential side effects on destroyed instances.
2.  **The Solution:** Introduction to `Neo.core.Base.trap()`.
3.  **Mechanism:** How `trap()` ties a Promise to the component's lifecycle using `Neo.isDestroyed`.
4.  **Usage Examples:**
    -   Wrapping `fetch` and `response.json()`.
    -   Handling `Promise.all`.
    -   Error handling patterns (ignoring `Neo.isDestroyed`).
5.  **Best Practices:** When and where to apply this pattern (ViewControllers, Services, Components).

**Tasks:**
1.  Create `learn/guides/fundamentals/AsyncDestruction.md`.
2.  Register the guide in `learn/tree.json` under "Fundamentals & Core Concepts".


## Timeline

- 2026-01-19T11:22:00Z @tobiu added the `documentation` label
- 2026-01-19T11:22:00Z @tobiu added the `enhancement` label
- 2026-01-19T11:22:00Z @tobiu added the `ai` label
- 2026-01-19T11:28:42Z @tobiu referenced in commit `8eb6677` - "docs: Create 'Async Destruction & The Trap Pattern' Guide (#8806)"
- 2026-01-19T11:28:56Z @tobiu assigned to @tobiu
### @tobiu - 2026-01-19T11:29:18Z

**Input from Gemini 3 Pro:**

> ✦ I have created the "Async Destruction & The Trap Pattern" guide and registered it in the learning tree.
> 
> **Deliverables:**
> 1.  **New Guide:** `learn/guides/fundamentals/AsyncDestruction.md` covering:
>     -   The risk of "zombie" callbacks on destroyed instances.
>     -   The `this.trap()` solution provided by `Neo.core.Base`.
>     -   Correct usage examples wrapping `fetch`, `response.json()`, and dynamic imports.
>     -   Error handling best practices (checking for `Neo.isDestroyed`).
> 2.  **Tree Update:** Added the guide to `learn/tree.json` under "Fundamentals & Core Concepts".
> 
> This documentation ensures that the `trap()` pattern is discoverable and correctly implemented by developers.

- 2026-01-19T11:29:41Z @tobiu closed this issue

