TypeScript Lab: Current Record State Inspector

LAB / EXPLORATION

TypeScript Lab: Current Record State Inspector

Planned

LAB 060 — Browser State
Display application state while selecting different records.

LAB TypeScript Lab: Current Record State Inspector Preview coming soon

LAB 060

TypeScript Lab: Current Record State Inspector

Concept

Mutable state variables track the record and nodes currently driving the interface.

Concept

Mutable state variables track the record and nodes currently driving the interface.

Objective & Explanation

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

Learning Target

Objective

Display application state while selecting different records.

Explanation

Mutable state variables track the record and nodes currently driving the interface.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── tsconfig.json
├── index.html
├── styles.css
└── src/
    └── app.ts

Technologies

TypeScript
DOM
HTML
CSS
JSON

Data Layer

Use a small local object, array, or JSON fixture so the transformation stays visible.

Sandbox Source

src/local-editor/client.ts

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

Change one input and observe the visible output change.

Code & Configuration

Starter configuration plus the focused implementation example.

Focused TypeScript

Implement this behavior first, then alter the input.

let currentRecord: RecordRow | null = null;
let currentNodes: NodeRow[] = [];
let editingNodeId: string | null = null;

function selectRecord(record: RecordRow) {
  currentRecord = record;
  renderState();
}

Starter Configuration

Keep the project independently buildable.

package.json

{
  "type": "module",
  "scripts": { "build": "tsc" },
  "devDependencies": { "typescript": "^7.0.2" }
}

tsconfig.json

{
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["ES2022", "DOM"],
    "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: display application state while selecting different records.

Data: JSON