r-async-value

AsyncValue

An ADT for representing an async value over time

const asyncTodos: AsyncValue<Error, Todo[]> = notAsked

async function loadTodos() {
    asyncTodos = pending
    try {
        const todos = await fetchTodos()
        asyncTodos = success(todos)
    } catch (reason) {
        asyncTodos = failure(reason)
    }
}