ZacSweers/metro

Health v2 · maintenance only

Adoption not part of the score

1372 stars · 106 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Metro is a compile-time dependency injection framework for Kotlin Multiplatform, implemented as a Kotlin compiler plugin with FIR/IR code generation. It combines ideas from Dagger, Anvil, and kotlin-inject, supporting JVM, JS, Wasm, and Native targets without KAPT or KSP.

Use cases

• dependency injection in Kotlin Multiplatform projects
• catch DI graph errors at compile time instead of runtime
• migrate incrementally from Dagger or kotlin-inject
• avoid KAPT/KSP overhead with a compiler-plugin-based DI framework
• aggregate DI contributions across modules like Anvil
• share dependency graphs across JVM, JS, Wasm, and Native targets

When to choose

• you want fast, compile-time-validated DI in Kotlin Multiplatform
• you prefer a Kotlin-first API over Java-oriented Dagger
• you need Anvil-style contribution aggregation
• you want to incrementally migrate from Dagger, Guice, or kotlin-inject

When to avoid

• you need runtime or reflection-based DI like Guice or Koin
• your project is not on Kotlin 2.x with compiler plugin support
• you rely on Dagger features or ecosystems Metro does not yet support
• you need a very mature, battle-tested framework with a large community

Facets

library · maturity active

compiler build-tool developer-tools programming-languages developer-tools cross-platform compilers jvm wasm cli kotlin-multiplatform compiler-plugin dagger-alternative jsr-330 anvil code-generation compile-time-validation dependency-injection nodejs

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