What is node package walker? - node.js

Question

I've taken up the job from another freelancer who isn't currently engaged on this project.
He has done some work which I don't understand. Can anyone help me with that.
Every time a user hires a parking spot, I want to notify a merchant.
here is the query to create a booking:
exports.createBooking = async (req, res) => {
try {
const user = await Auth.findOne({ _id: req.data.id });
if (!user) return res.status(404).json({ error: "User not found" });
const bookingDetails = new Booking({
userId: req.data.id,
parkingId: req.body.parkingId,
duration: req.body.duration,
date: moment(req.body.date).format("MMM DD, YYYY"),
startTime: req.body.startTime,
endTime: req.body.endTime,
paymentAmount: req.body.paymentAmount,
isFeePaid: req.body.isFeePaid,
status: "sent",
});
bookingDetails.populate("walkerId");
const save = await bookingDetails.save();
// send notification to walker
let notification_data = {
name: `${owner.basicInfo.fullName}`,
date: moment(req.body.date).format("MMM DD, YYYY"),
startTime: req.body.startTime,
};
let { title, body } = notificationTypes.addBooking(notification_data);
let data = {
senderId: req.data.id,
receiverId: req.body.walkerId,
notificationSendTo: "walker",
title,
body,
};
sendNotification(data);
return res.status(200).json({
success: true,
msg: "Service Booked",
data: { details: save },
});
} catch (error) {
return res.status(500).json({ error: error.message });
}
};
And the booking schema looks like this:
const bookingSchema = new mongoose.Schema(
{
parkingId: {
type: mongoose.Schema.Types.ObjectId,
ref: "Parking",
},
userId: {
type: mongoose.Schema.Types.ObjectId,
ref: "Auth",
},
duration: {
type: String,
},
date: {
type: String,
},
startTime: {
type: Date,
},
endTime: {
type: Date,
},
isFeePaid: {
type: Boolean,
default: false,
},
status: {
type: String,
enum: [
"confirmed",
"sent",
"pending",
"accepted",
"rejected",
"cancelled",
"start",
"completed",
],
},
isBookingCancelled: {
cancelBy: {
type: mongoose.Schema.Types.ObjectId,
ref: "User",
},
value: {
type: Boolean,
default: false,
},
cancellationReason: {
type: String,
maxlength: 255,
trim: true,
},
},
paidAmount: {
type: Number,
},
paymentId: {
type: mongoose.Schema.Types.ObjectId,
ref: "Payment",
},
paymentAmount: {
type: Number,
},
isStarted: {
type: Boolean,
default: false,
},
isEnabled: {
type: Boolean,
default: false,
},
},
{
timestamps: true,
}
);
I am aware that the schema lacks a walkerId, which would cause an error to be thrown, but I have never used walker thus I have no idea how to incorporate it.