TypeScript Lab: Record Preview Query

LAB / EXPLORATION

TypeScript Lab: Record Preview Query

Planned

LAB 058 — SQLite & Data Access
Find a record's first visible display node.

LAB TypeScript Lab: Record Preview Query Preview coming soon

LAB 058

TypeScript Lab: Record Preview Query

Concept

A focused query can retrieve one ordered piece of related content.

Concept

A focused query can retrieve one ordered piece of related content.

Objective & Explanation

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

Learning Target

Objective

Find a record's first visible display node.

Explanation

A focused query can retrieve one ordered piece of related content.

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/generator/generate.ts → getPreviewForRecord()

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 preview = database.prepare(`
  SELECT content
  FROM content_nodes
  WHERE record_id = ?
    AND hidden = 0
    AND type IN ('display', 'preview')
  ORDER BY sort_order
  LIMIT 1
`).get(recordId);

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: find a record's first visible display node.

Data: SQLite