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Diving Deeper: How Module Loaders Work

Let's illustrate‍ with a simplified⁢ example using a hypothetical module loader. Imagine you have two files: moduleA.js ⁢ and main.js.

moduleA.js:

javascript
// Export a function
export function greet(name) {
  return "Hello, " + name + "!";
}

main.js:

javascript
// Import the greet function from moduleA
import { greet } from './moduleA.js';

// Use the greet function
const message = greet("World");
console.log(message); // Output: Hello, World!

Here's what happens behind the scenes:

1. Dependency Resolution: The⁣ module loader analyzes main.js and identifies⁣ the dependency on moduleA.js.
2. Loading: It fetches moduleA.js.
3. Execution: The module ⁢loader‍ executes moduleA.js, making the greet ⁢function available.
4. Importing: The greet ⁤function is ⁤then imported into main.js.
5. Execution (main.js): main.js executes