Persistent Vue reactive context backed by QuickBEAM.

Each Runtime holds a QuickBEAM process with Vue's reactivity system loaded. ref() values become reactive state, computed() values auto-update when dependencies change, and functions execute in-place against reactive refs.

State persists across calls — the same reactive graph lives for the lifetime of the owning LiveView process.

Context Pool mode

When a QuickBEAM.ContextPool is configured, each Runtime uses a lightweight context (~50KB) on a shared thread pool instead of a dedicated OS thread (~2MB). This is the recommended mode for production — 10K LiveViews share 4 OS threads instead of spawning 10K.

# In your application supervisor:
{QuickBEAM.ContextPool, name: MyApp.JSPool, size: 4}

# In config:
config :phoenix_vapor, pool: MyApp.JSPool

Without a pool, each Runtime gets its own QuickBEAM runtime (full isolation, higher resource usage).

Usage

{:ok, rt} = Runtime.start_link(
  refs: %{"count" => "0"},
  computeds: %{"doubled" => "count * 2"},
  functions: ["increment"],
  function_bodies: %{"increment" => "count++"}
)

{:ok, state} = Runtime.get_state(rt)
{:ok, state} = Runtime.call_handler(rt, "increment", %{})