Your objects are rented from the framework

Here is a test you can run on any Vue codebase in thirty seconds: find the order, the invoice, the document — the thing your product is actually about — and ask where it lives. In most codebases the answer is: nowhere. It exists as fragments — a composable here, a pinia slice there, props threaded four levels down — and every fragment's lifetime is chained to whatever component happens to be mounted. Close the tab panel, and your "order" ceases to exist.

That's not architecture. That's renting.

A domain object deserves what every object in every other kind of software has had for fifty years: identity, state, behavior, and a lifetime it owns. The reason frontend gave that up isn't philosophical — it's that making a class reactive used to cost too much: a proxy per object, eager computeds per field, this breaking in every handler. So the field normalized statelessness and called it a virtue.

ivue re-prices the deal. An instance is a plain object; nothing allocates until first access; derivations live once, on the prototype. The measured consequence: one million live class instances in 22 ms and 3.7 KB each under observation — populations that OOM every alternative pattern on the same machine. At that price, your order can simply be an object again — watchable, derivable, inheritable — constructed where you choose, disposed when you say:

class $Order {
  get items() {
    return shallowRef<OrderItem[]>([]);
  }
  get total() {
    return this.items.value.reduce((sum, item) => sum + item.price, 0);
  }
}

Lifetime is a choice, not a sentence. Construct in a component and the component reaps everything; construct in a module and the instance outlives every mount, with $stopEffects() as the deterministic end. Watch teardown behave, live:

$watch and $stopEffects, liveLive · runs the shipped engine

temp

20°

watcher

off

fired

0×

Start registers a watcher in the instance's lazily created effect scope. Dispose calls $stopEffects: the scope stops and every cached cell is dropped, so state re-materializes fresh.

The eviction notice, formally: ivue vs the World — the head-to-head against every other way of owning objects. Then read Lifecycle & Teardown and take your objects back.