TypeScript Lab: Node Outline Tree

LAB / EXPLORATION

TypeScript Lab: Node Outline Tree

Planned

LAB 065 — Browser State
Render ordered parent and child nodes as an editor outline.

LAB TypeScript Lab: Node Outline Tree Preview coming soon

LAB 065

TypeScript Lab: Node Outline Tree

Concept

Hierarchy rendering combines sorting, parent lookup, expansion state, and events.

Concept

Hierarchy rendering combines sorting, parent lookup, expansion state, and events.

Objective & Explanation

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

Learning Target

Objective

Render ordered parent and child nodes as an editor outline.

Explanation

Hierarchy rendering combines sorting, parent lookup, expansion state, and events.

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 → renderOutline()

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.

const parents = nodes.filter(node => !node.parent_id);

for (const parent of parents) {
  const children = nodes.filter(node => node.parent_id === parent.id);
  renderParent(parent, children);
}

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: render ordered parent and child nodes as an editor outline.

Data: JSON