This tool help to make diff on a state when using a TCA app

DiffStatePropertyWrapper.swift

import Foundation
import CustomDump

@propertyWrapper
public struct Diff<Value: Equatable>: Equatable {
  public static func == (lhs: Diff<Value>, rhs: Diff<Value>) -> Bool {
    lhs.value == rhs.value
  }

  private var value: Value
  private(set) var previous: Value? = nil

  public init(wrappedValue: Value) {
    self.value = wrappedValue
  }

  public var wrappedValue: Value {
    get { value }

    set {
      previous = value
      if let output = diff(value, newValue) { print(output) }
      value = newValue
    }
  }

  public var projectedValue: Self {
    return self
  }
}