Callable Formatter Object

In JavaScript, functions are objects. In TypeScript, an interface can include a call signature and extra properties. This lets you create a callable object with fields.

You will build a function that returns a callable formatter with a label property.

interface ToText {
  (n: number): string;
  label: string;
}

Your Task

Build a factory that returns a callable formatter with a label.

• Declare interface Formatter { (n: number): string; label: string }.
• Implement makeFormatter(prefix: string): Formatter.
• The returned function should format as "<prefix><n>" and also have label === prefix.
• Keep the implementation small.