TypeScript Lab: Compiler Target Switch

LAB / EXPLORATION

TypeScript Lab: Compiler Target Switch

Planned

LAB 008 — TypeScript Toolchain
Compare TypeScript source with different JavaScript output targets.

LAB TypeScript Lab: Compiler Target Switch Preview coming soon

LAB 008

TypeScript Lab: Compiler Target Switch

Concept

The compiler target controls which JavaScript syntax TypeScript emits.

Concept

The compiler target controls which JavaScript syntax TypeScript emits.

Objective & Explanation

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

Learning Target

Objective

Compare TypeScript source with different JavaScript output targets.

Explanation

The compiler target controls which JavaScript syntax TypeScript emits.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── package-lock.json
├── tsconfig.json
├── index.html
└── src/
    └── app.ts

Technologies

TypeScript
Node.js
npm
HTML
CSS

Data Layer

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

Sandbox Source

tsconfig.json

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 target = "ES2022";
const example = `const greet = (name: string) => \`Hello ${name}\`;`;

document.querySelector("#target")!.textContent = target;
document.querySelector("#source")!.textContent = example;

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: compare TypeScript source with different JavaScript output targets.

Data: None