Table of Contents

1. Using provide/inject in Vue.js 3 with the Composition API
2. Using the provide function
3. Using the inject function
4. Advanced Use Cases
   • Dependency injection patterns
   • Dynamic Injection with Symbols
5. Pain points and how to avoid them

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1. Using provide/inject in Vue.js 3 with the Composition API

• provide and inject functions are used to pass data from parent to child components in Vue.js 3.
• They allow for passing data regardless of component hierarchy depth.

2. Using the provide function

• Scaffold a new Vue app using the Composition API.
• Define data or objects to be passed down to child components.
• Use the provide function within the component's function to define the data.
• Parameters:
  • Injection key
  • Value associated with the injection key

3. Using the inject function

• Import the inject function into the component.
• Specify the property to be injected.
• Optional: Set a default value if no value is found.
• Parameters:
  • Key (must match the injection key)
  • Default value (optional fallback value)

4. Advanced Use Cases

Dependency injection patterns

• Manage dependencies in Vue applications using provide/inject to avoid tightly coupled components.
• Example: Injecting a logging service into multiple components.

Dynamic Injection with Symbols

• In large projects, use symbols to avoid key collision and conflicts.
• Create symbols for providing values in the parent component and inject them in the child component.
• Example: Handling authentication state with an authentication service.

5. Pain points and how to avoid them

• provide/inject pair has shortcomings like potential key collision and maintenance issues.
• Suggestions for avoiding pain points include careful key naming, using symbols, and separating concerns.

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This structure breaks down the concept of using provide/inject in Vue.js 3 with the Composition API, covering basic usage, advanced patterns, and strategies to overcome potential challenges.