TypeScript Lab: Load Script Dynamically

LAB / EXPLORATION

TypeScript Lab: Load Script Dynamically

Planned

LAB 071 — DOM & Async
Insert a script element and report when it becomes available.

LAB TypeScript Lab: Load Script Dynamically Preview coming soon

LAB 071

TypeScript Lab: Load Script Dynamically

Concept

Dynamic scripts expose asynchronous loading and failure states.

Concept

Dynamic scripts expose asynchronous loading and failure states.

Objective & Explanation

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

Learning Target

Objective

Insert a script element and report when it becomes available.

Explanation

Dynamic scripts expose asynchronous loading and failure states.

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 → loadScript()

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.

function loadScript(url: string): Promise<void> {
  return new Promise((resolve, reject) => {
    const script = document.createElement("script");
    script.src = url;
    script.onload = () => resolve();
    script.onerror = () => reject(new Error("Script failed"));
    document.head.append(script);
  });
}

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: insert a script element and report when it becomes available.

Data: None