Provide and Inject

Dependency Injection in Vue

provide/inject passes values down a component lineage without prop drilling.

Good for theme/form controllers; use Pinia for app-wide business state.

const key = Symbol('form')
provide(key, formApi)
const formApi = inject(key)

Symbol keys avoid collisions.

Defaults

inject(key, defaultValue)

• Prefer Composition API + script setup.
• Use computed for derived UI.
• Keep side effects intentional.
• Practice in a small Vite app.

Provide and Inject Cheatsheet

Quick reference for patterns covered in this lesson.

Mutability

Provide readonly state + methods to control updates.

Common Mistakes

• String keys colliding.
• Using provide/inject for unrelated domains better suited to Pinia.

Key Takeaways

• Provide and Inject is important in Vue apps.
• Practice in SFCs.
• Prefer clear naming.
• Check Vue docs for details.