TypeScript Lab: Reparent Node

LAB / EXPLORATION

Planned

LAB 102 — Tree Structures
Move a node between parents and show its new hierarchy.

LAB TypeScript Lab: Reparent Node Preview coming soon

LAB 102

TypeScript Lab: Reparent Node

Concept

Reparenting changes relationship and ordering while enforcing hierarchy constraints.

Concept

Reparenting changes relationship and ordering while enforcing hierarchy constraints.

Objective & Explanation

What the project should make visible and why the concept matters.

Learning Target

Objective

Move a node between parents and show its new hierarchy.

Explanation

Reparenting changes relationship and ordering while enforcing hierarchy constraints.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── tsconfig.json
├── index.html
├── styles.css
├── data/
│   └── learning.db
└── src/
    ├── client.ts
    └── server.ts

Technologies

TypeScript
Node.js
SQLite
HTML
CSS

Data Layer

Use SQLite learning rows. Isolate destructive practice from important Sandbox records.

Sandbox Source

src/local-editor/server.ts → reparentNode()

Build Instructions

Build only the focused behavior, then use the visual layer to inspect it.

Setup

Create the standalone project folder and listed files.

Implement

Implement the smallest version that demonstrates the concept.

Run & Inspect

Render the returned or changed data in the browser.

Code & Configuration

Starter configuration plus the focused implementation example.

Focused TypeScript

Implement this behavior first, then alter the input.

database.prepare(`
  UPDATE content_nodes
  SET parent_id = ?, sort_order = ?
  WHERE id = ?
`).run(targetParentId, nextOrder, nodeId);

Starter Configuration

Keep the project independently buildable.

package.json

{
  "type": "module",
  "scripts": {
    "build": "tsc",
    "start": "npm run build && node --enable-source-maps dist/server.js"
  },
  "devDependencies": {
    "@types/node": "^26.4.0",
    "typescript": "^7.0.2"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["ES2022", "DOM"],
    "types": ["node"],
    "strict": true,
    "sourceMap": true
  },
  "include": ["src/**/*.ts"]
}

Expected Visual Result

The output is the proof that the concept is working.

Visible Proof

The browser should visibly demonstrate: move a node between parents and show its new hierarchy.

Data: SQLite