Macro MaybeStoredKey

macro_rules! MaybeStoredKey {
    ($key_name:ident, Value = $val:ty, Path = $path:expr, Serialize = $serialize:expr, Deserialize = $deserialize:expr) => { ... };
}

Example usage:

// need to import Signal, Global, SyncStorage from dioxus, more imports for the other stuff as well
use dioxus::prelude::*;
use tokio::{
    fs::{File, remove_file},
    io::{AsyncReadExt, AsyncWriteExt},
};
use std::{
    ops::{Deref, DerefMut},
    path::PathBuf,
};

struct ExampleKey;

MaybeStoredKey! {
    ExampleKey,
    Value = i32,
    Path = "somedir",
    Serialize = |val: &i32| val.to_string().into_bytes(),
    Deserialize = |contents: &[u8]| {
        String::from_utf8(contents.to_vec())
            .unwrap()
            .parse()
            .unwrap()
    }
}