TypeScript Lab: Promise Loading Board

LAB / EXPLORATION

TypeScript Lab: Promise Loading Board

Planned

LAB 072 — DOM & Async
Track several asynchronous resources on one visual status board.

LAB TypeScript Lab: Promise Loading Board Preview coming soon

LAB 072

TypeScript Lab: Promise Loading Board

Concept

Promise.all coordinates independent asynchronous work before continuing.

Concept

Promise.all coordinates independent asynchronous work before continuing.

Objective & Explanation

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

Learning Target

Objective

Track several asynchronous resources on one visual status board.

Explanation

Promise.all coordinates independent asynchronous work before continuing.

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

Data Layer

No persistent data layer. Keep all demonstration values inside the standalone project.

Sandbox Source

src/local-editor/client.ts → ensureCodeTools()

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.

await Promise.all([
  loadStyle("editor.css"),
  loadScript("editor.js"),
  loadScript("formatter.js"),
]);

status.textContent = "All resources loaded";

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: track several asynchronous resources on one visual status board.

Data: None