TypeScript Node.js project: The ATM functionalities
This function generates a random 16-digit debit card number that starts with '4'. It's used when creating a new customer account.
#### `openAccount`
The `openAccount` function allows a user to open a new account by collecting their name, initial deposit, and PIN. It also validates the input and creates a new customer object.
#### `saveCustomerData`
This function saves customer data (an array of `Customer` objects) to a JSON file named 'customerData.json'.
#### `retrieveCustomerData`
`retrieveCustomerData` reads customer data from the 'customerData.json' file and returns it as an array of `Customer` objects.
#### `authenticateUser`
`authenticateUser` is used to authenticate a user by asking for their name and PIN and checking if they are an existing customer.
#### `atmMenu`
`atmMenu` displays a menu with options such as withdrawing money, depositing money, checking balance, and exiting. It calls the corresponding functions based on the user's choice.
#### `withdrawMoney` and `depositMoney`
These functions handle the withdrawal and deposit operations, respectively. They collect user input, perform the transactions, and update the customer's balance.
#### `main`
The `main` function is the entry point of the script. It loads customer data, presents options to the user (open an account, authenticate, or exit), and calls the appropriate functions based on the user's choice.
6. Export and Execution
```javascript
export { main }
main();
```
The `main` function is exported, and then it's immediately executed when the script is run. This starts the ATM simulation by presenting the initial options to the user.
In summary, this script simulates a basic ATM system, allowing users to open accounts, authenticate, and perform transactions like withdrawing and depositing money. It stores customer data in a JSON file and uses various Node.js packages for input/output and user interaction.