Effect scope is used in Vue 3 for structured management of responsive side effects, you can unify cleaning by creating an effectScope instance and using scope.run() to use scope.stop(). It is suitable for scenarios such as building custom combination functions, managing dynamic functional modules and developing plug-ins, and is especially suitable for situations where side effects life cycles need to be manually controlled. When using it, be careful that stop() must be called explicitly to clean it up, and the responsive logic of the built-in components has been automatically managed by Vue without additional wrapping. In addition, scopes can be nested, and all child scopes will stop when the parent scope stops.
In Vue 3, the effect scope is a feature that allows you to group and control reactive effects (like watchers or computed properties) in a more structured way. It's especially useful when you want to manually manage when these effects are activated or stopped, such as in advanced use cases or reusable logic.
What is an effect scope exactly?
An effect scope is like a container for reactive effects. When you create one using effectScope() , it gives you an object that can hold effects created inside it using scope.run() . These effects are then tied to the lifecycle of the scope, meaning you can stop them all at once by calling scope.stop() .
This is helpful if you're building something like custom composition APIs or plugins where you need to manage reactivity more precisely — for example, pausing or cleaning up multiple watchers or computed refs together.
How to use effect scope in practice
Here's a basic usage pattern:
import { effectScope, ref, watch } from 'vue'
const scope = effectScope()
scope.run(() => {
const count = ref(0)
watch(count, (newVal) => {
console.log('Count changed:', newVal)
})
setInterval(() => {
count.value
}, 1000)
}) In this case, the watcher and the interval are part of the scope. If you later call scope.stop() , the watcher will be cleaned up automatically.
- You don't have to manually clean up each watcher or effect.
- This is useful for dynamic components or features that may be toggled on/off during runtime.
When should you care about effect scopes?
You probably won't need to use effectScope directly in most everyday Vue code. But here are a few scenarios where it becomes handy:
- Building custom composition functions that internally use watchers or computed values and need to be cleaned up properly.
- Managing dynamic parts of your app , like tabs or modals, where you want to pause or destroy associated effects cleanly.
- Writing plugins or utilities that work with reactivity but need to respect component lifecycles or external control.
If you're writing a function that creates several reactive effects and you want to give the caller control over when those effects are disposed, wrapping them in a scope makes sense.
A couple of things to keep in mind
- Effects inside a scope don't automatically clean up unless you call
scope.stop(). - If you're using Vue's built-in reactivity system inside components (like
watch,computed, etc.), they're already managed by Vue internally — you don't need to wrap them in a scope unless you're doing something special. - Scopes can be nested, and stopping a parent scope also stops all child scopes.
So while effectScope isn't something every Vue developer touches daily, it's a powerful tool when working with advanced patterns or abstractions.
Basically that's it.
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