GetGreetingLambda.ts

export interface GetGreetingRequest {
  firstName: string;
  lastName: string;
  isFormal: boolean;
}

export interface GetGreetingResponse {
  greeting: string;
}

export const handler = async (event: GetGreetingRequest): Promise<GetGreetingResponse> => {
  const greeting = event.isFormal ?
    `Dear ${event.firstName} ${event.lastName}, welcome back.` :
    `Hey ${event.firstName} ${event.lastName}! Long time no see.`;

  return {
    greeting,
  }
};