Composite Example

// Component interface
interface FileSystemComponent {
  name: string;
  open(): void;
}

// Leaf Node
class File implements FileSystemComponent {
  constructor(public name: string) {}

  open() {
    console.log(`Opening the file ${this.name}`);
  }
}

// Composite Node
class Folder implements FileSystemComponent {
  name: string;
  children: FileSystemComponent[] = [];

  constructor(name: string) {
    this.name = name;
  }

  add(child: FileSystemComponent): void {
    this.children.push(child);
  }

  open() {
    console.log(`Opening the folder ${this.name}`);
    this.children.forEach(child => child.open());
  }
}

// Usage
const file1 = new File("file1.txt");
const file2 = new File("file2.txt");
const folder1 = new Folder("folder1");

// Adding files to folder1
folder1.add(file1);
folder1.add(file2);

// Create another folder and add folder1 to it
const folder2 = new Folder("folder2");
const file3 = new File("file3.txt");
folder2.add(file3);
folder2.add(folder1);

// Now open all files in folder2. This should also open all files in folder1
folder2.open();