TypeScript Lab: Next Sort Order

LAB / EXPLORATION

TypeScript Lab: Next Sort Order

Planned

LAB 099 — Tree Structures
Calculate the next ordered position for a new node.

LAB TypeScript Lab: Next Sort Order Preview coming soon

LAB 099

TypeScript Lab: Next Sort Order

Concept

MAX plus a consistent step provides space for predictable ordered insertion.

Concept

MAX plus a consistent step provides space for predictable ordered insertion.

Objective & Explanation

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

Learning Target

Objective

Calculate the next ordered position for a new node.

Explanation

MAX plus a consistent step provides space for predictable ordered insertion.

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 → nextSortOrder()

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.

const row = database.prepare(`
  SELECT COALESCE(MAX(sort_order), 0) AS max_order
  FROM content_nodes
  WHERE record_id = ?
`).get(recordId) as { max_order: number };

const next = row.max_order + 10;

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: calculate the next ordered position for a new node.

Data: SQLite