If i used class A extends class B, when refresh page, class A will lose methods in class B

[ganker-vito]

i known the reason maybe is : prototype
but how can i use if i need class B method, but now is undefined

# demo
class A {
  say() {
    console.log('say')
}
}
export default defineStore('store', {
  state: () => {
  a : new A()
}
})
# than  refresh page ,  if i do  a.say() ==> undefined

[posva]

You need to add a custom serialization mechanism for classes to work with SSR (or local storage if that's what you are using). I need to add a cookbook entry page in the docs based on one of my lessons in Mastering Pinia but it sums up to using payload plugins in nuxt or https://github.com/Rich-Harris/devalue to serialize/revive classes

[ganker-vito]

You are great! �Thank you!