Let’s suppose we have this simple SwiftData model.

import Foundation
import SwiftData

@Model
final class Item {
    var timestamp: Date
    
    init(timestamp: Date) {
        self.timestamp = timestamp
    }
}

How to configure an EnvironmentKey with the new @Entry macro that uses the Item type?

The code below triggers an error at build time:

Static property ‘defaultValue’ is not concurrency-safe because non-‘Sendable’ type ‘EnvironmentValues.__Key_someItem.Value’ (aka ‘Optional’) may have shared mutable state

import SwiftUI
import SwiftData

extension EnvironmentValues {
    @Entry var someItem: Item? = nil
}

Tested with Xcode 16.0 beta (16A5171c) / Swift 6 / iOS 18.