mat

mat is a lightweight Scala 3 library for materializing types into values at compile time.

It provides a typeclass-based approach for turning types like tuples, literal types, or case classes into values using inline and Mirror.

---

✨ Features

• Materialize literal types like 5, "hello", true
• Recursively materialize tuples: (1, "abc", true)
• Materialize case classes via Mirror.ProductOf
• Materialize singleton sealed trait based ADTs via Mirror.SumOf
• Safe fallback with materializeOpt[A] returning Option

---

📦 Examples

Materialize a literal value

import io.github.scytrowski.mat.*

val x: 42 = materialize[42]
// x: 42

Materialize a tuple

import io.github.scytrowski.mat.*

val x: (true, 'd', "abc") = materialize[(true, 'd', "abc")]
// x: (true, 'd', "abc")

Materialize a case object

import io.github.scytrowski.mat.*

case object SomeObject

val x: SomeObject.type = materialize[SomeObject.type]
// x: SomeObject

Materialize a case class

import io.github.scytrowski.mat.*

case class SomeClass[A](a: A)

val x: SomeClass[15] = materialize[SomeClass[15]]
// x: SomeClass(15)

Materialize a singleton ADT variant

import io.github.scytrowski.mat.*

sealed trait SomeADT

case object SingletonVariant extends SomeADT

val x: SingletonVariant.type = materialize[SomeADT]
// x: SingletonVariant

Provide custom materialization logic

import io.github.scytrowski.mat.*

sealed abstract class SomeClass

object SomeClass:
  val instance: SomeClass = new SomeClass {}

given CustomMaterialize[SomeClass]:
  override type Out = SomeClass
  override def apply(): SomeClass = SomeClass.instance

val x: SomeClass = materialize[SomeClass]
// x: SomeClass.instance

Require a materializable type

import io.github.scytrowski.mat.*

def doSomethingWithMaterializableType[A: Materialize] = ???

---

🚧 TODO

• Support intersection types - e.g.: 5 & Int should materialize as 5
• Support union types - e.g.: 5 | String should materialize as 5
• Support nested singleton ADTs

---

📄 License

This project is licensed under the MIT License.

You are free to use, copy, modify, and distribute it with attribution.