TypeScript Lab: Source vs Dist Viewer

LAB / EXPLORATION

TypeScript Lab: Source vs Dist Viewer

Planned

LAB 002 — TypeScript Toolchain
Show how source TypeScript becomes compiled JavaScript output.

LAB TypeScript Lab: Source vs Dist Viewer Preview coming soon

LAB 002

TypeScript Lab: Source vs Dist Viewer

Concept

rootDir and outDir separate authored source from generated files.

Concept

rootDir and outDir separate authored source from generated files.

Objective & Explanation

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

Learning Target

Objective

Show how source TypeScript becomes compiled JavaScript output.

Explanation

rootDir and outDir separate authored source from generated files.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

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

// src/app.ts
const source: string = "src/app.ts";
const output: string = "dist/app.js";
document.querySelector("#flow")!.textContent = `${source} → tsc → ${output}`;

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: show how source TypeScript becomes compiled JavaScript output.

Data: None