This library provides a simple implementation of an maker checker management system, allowing users to create requests and approvers to approve or deny those requests based on certain rules.

• User management: The User class represents a user in the system, with a name and a list of types (e.g., A, B, C).
• Request management: The Request class represents a request, with a request type and the requester. Requests have an expiration time of 5 minutes.
• Approval management: The Approver class represents an approver, who can approve or deny a request based on the request type and the approver's user types.

  TYPES = {A, B, C}

const user1 = new User('John Doe', [TYPES.A, TYPES.B]);
const user2 = new User('Jane Smith', [TYPES.A, TYPES.C]);

const request1 = new Request(TYPES.B, user1);
const request2 = new Request(TYPES.C, user2);

const approver1 = new Approver(request1, user2);
const approver2 = new Approver(request2, user1);

console.log(approver1.canApprove()); // false
console.log(approver2.canApprove()); // true

console.log(approver2.approve()); // true
console.log(approver1.deny()); // true

On your terminal, run

npm run start

Output will be displayed on the terminal.

• constructor(name, types): Creates a new User instance with the given name and types.

• constructor(requestType, requester): Creates a new Request instance with the given request type and requester.
• isExpired(date): Checks if the given date has passed the request's expiration time.

• constructor(request, approver): Creates a new Approver instance with the given request and approver.
• canApprove(): Checks if the approver can approve the request based on the request type and the approver's user types.
• approve(): Approves the request if the approver can approve it.
• deny(): Denies the request if it has not expired.

The library does not include explicit error handling, but it logs relevant information to the console when certain conditions are not met (e.g., unauthorized request type, expired request).

Due to the time constraints, the following was left unattended.

• Add more robust error handling and exception throwing.
• Implement a database layer to store and retrieve user, request, and approval data.
• Comprehensive Unit testing
• Retrival of request history from the database