TypeScript Lab: Delete Node Tree

LAB / EXPLORATION

TypeScript Lab: Delete Node Tree

Planned

LAB 104 — Tree Structures
Delete a parent and its immediate child nodes safely.

LAB TypeScript Lab: Delete Node Tree Preview coming soon

LAB 104

TypeScript Lab: Delete Node Tree

Concept

Hierarchical deletion removes dependent children before removing the selected parent.

Concept

Hierarchical deletion removes dependent children before removing the selected parent.

Objective & Explanation

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

Learning Target

Objective

Delete a parent and its immediate child nodes safely.

Explanation

Hierarchical deletion removes dependent children before removing the selected parent.

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 → deleteNodeTree()

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(`
  DELETE FROM content_nodes
  WHERE parent_id = ?
`).run(nodeId);

database.prepare(`
  DELETE FROM content_nodes
  WHERE id = ?
`).run(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: delete a parent and its immediate child nodes safely.

Data: SQLite