Cannot find withAnimation in scope error

You are new to the forum, welcome.

When you post code, please use code formatting tool. As is, your code is unreadable.

import Foundation
import MapKit

class LocationsViewModel: ObservableObject {
     //All loaded locations
     @Published var locations: [Locations]
     //Current location on the map
     @Published var mapLocation: Locations
     @Published var mapRegion: MKCoordinateRegion = MKCoordinateRegion()
     let mapSpan = MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)
     init() {
          let locations = LocationsDataService.locations
          self.locations = locations
          self.mapLocation = locations.first!
          self.updateMapRegion(locations: locations.first!)
     }
     private func updateMapRegion (locations:Locations) { withAnimation(.easeInOut) {
          mapRegion = MKCoordinateRegion( center: Locations.coordinates, span: mapSpan)
     }
     }
}

There are several errors or omissions:

• Where is Locations defined (it should probably be named Location)
• what is this syntax ?
• what do you try to animate ?

func updateMapRegion (locations:Locations) { withAnimation(.easeInOut) {

When you call

mapRegion = MKCoordinateRegion( center: Locations.coordinates, span: mapSpan)

you probably mean

mapRegion = MKCoordinateRegion( center: locations.coordinates, span: mapSpan) // locations not Locations

But locations is an array, so locations.coordinates is incorrect. It should probably be locations[someIndex].coordinates

You should study a bit more the basics of Swift and app development before trying to write such code.

You should need to import SwiftUI in your file. I think that's the issue.

Import SwiftUI