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TypeScript Modules and Namespaces

Organize code using ES modules (import/export) and internal namespaces.

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While ES Modules (import / export) are the industry standard for modern TypeScript applications, namespaces (namespace Utility {}) allow scoping variables across legacy codebases.

Key Takeaways: TypeScript Modules and Namespaces

Mastering TypeScript Modules and Namespaces helps you write clean and reliable TypeScript code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

TypeScript Modules and Namespaces Code Example

TypeScript 
namespace MathHelper {
  export const PI = 3.14159;
  export function circleArea(r: number): number {
    return PI * r * r;
  }
}

console.log("Circle Area:", MathHelper.circleArea(10));
Output
Circle Area: 314.159
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TypeScript Declaration Files

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