Decorators

Overview

Decorators provide annotations for class methods and arguments. Decorators use the form @decorator where decorator is the name of the function that will be called at runtime.

Basic Usage

txIdFromHeader

This simple decorator allows you to annotate a Controller method argument. The decorator will annotate the method argument with the value of the header X-Transaction-Id from the request.

Example

class MyController {
  @get('/')
  getHandler(@txIdFromHeader() txId: string) {
    return `Your transaction id is: ${txId}`;
  }
}

Related Resources

You can check out the following resource to learn more about decorators and how they are used in LoopBack Next.

• TypeScript Handbook: Decorators
• Decorators in LoopBack