Metro is a compile-time dependency injection framework that draws heavy inspiration from Dagger, Anvil, and Kotlin-Inject. It seeks to unify their best features under one, cohesive solution while adding a few new features and implemented as a compiler plugin.
A compile-time dependency injection framework for Kotlin Multiplatform, powered by a Kotlin compiler plugin.
Metro is a compile-time dependency injection framework that combines the best of Dagger, Anvil, and kotlin-inject into one cohesive solution.
Key Features:
1. Apply the Gradle plugin:
plugins {
id("dev.zacsweers.metro") version "<version>"
}
2. Define a dependency graph:
@DependencyGraph
interface AppGraph {
val repository: UserRepository
@Provides
fun provideApi(): Api = ApiImpl()
}
@Inject
class UserRepository(private val api: Api)
3. Create and use the graph:
val graph = createGraph<AppGraph>()
val repository = graph.repository
Metro supports JVM, Android, JS, Wasm, and Native targets. The compiler plugin works with all Kotlin Multiplatform project types.
See the multiplatform docs for full details.
Copyright (C) 2025 Zac Sweers
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance the License.
You may obtain a copy of the License at
https:
Unless applicable law agreed to writing, software
distributed under the License distributed an BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express implied.
See the License the specific language governing permissions
limitations under the License.
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@ContributesTo, @ContributesBinding, and more| Topic |
|---|
| Installation | Setup and configuration |
| Dependency Graphs | Define and create graphs |
| Provides | Provider functions and properties |
| Injection Types | Constructor, assisted, and member injection |
| Scopes | Scoping and lifecycle management |
| Aggregation | Anvil-style contributions across modules |
| Interop | Dagger, kotlin-inject, and Guice compatibility |
| Performance | Build and runtime performance |
| Compatibility | Supported Kotlin versions |
| FAQ | Frequently asked questions |
| API Docs | Generated KDocs |