softwaremill/macwire

Health v2 · maintenance only

Adoption not part of the score

1314 stars · 77 forks observed · 2026-08-28

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

MacWire is a zero-cost, compile-time, type-safe dependency injection library for Scala built on macros. It generates instance-creation code automatically, avoiding boilerplate and runtime overhead while keeping classes free of annotations or conventions.

Use cases

• wire dependencies in a Scala application without runtime reflection
• eliminate boilerplate `new` instance creation code in Scala modules
• get compile-time errors for missing dependencies instead of runtime failures
• autowire class graphs using constructors and apply methods
• collect all instances of a type into a List or Set for multi-binding
• compose application modules with scopes and lazy initialization

When to choose

• you write Scala and want type-safe DI with no runtime overhead
• you prefer constructor-based wiring without annotations or container configuration
• you want dependency errors caught at compile time
• you target Scala JVM, JS, or Native platforms

When to avoid

• you need runtime- or container-based DI with dynamic service lookup
• your project is not in Scala
• you need features unavailable for your specific Scala version
• you rely on runtime plugin discovery or late binding

Facets

library · maturity stable

developer-tools developer-tools backend programming-languages jvm cross-platform dependency-injection scala macros compile-time type-safe zero-cost

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