{"id":75402,"library":"cats-effect-kernel-2-12","title":"Cats Effect Kernel","description":"Core abstractions for asynchronous and concurrent programming in Scala using cats-effect.","status":"active","version":"3.7.0","language":"java","source_language":null,"source_url":"https://github.com/typelevel/cats-effect","tags":["cats","effect","concurrency","scala","functional"],"install":[{"cmd":"<dependency>\n  <groupId>org.typelevel</groupId>\n  <artifactId>cats-effect-kernel_2.12</artifactId>\n  <version>3.7.0</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.typelevel:cats-effect-kernel_2.12:3.7.0'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"IO","correct":"cats.effect.IO"}],"quickstart":{"code":"import cats.effect.IO\n\nobject Example extends App {\n  val program: IO[Unit] = IO.println(\"Hello, Cats Effect!\")\n  program.unsafeRunSync()\n}","lang":"scala","description":"Minimal usage of cats-effect-kernel"},"warnings":[{"fix":"Use cats-effect 2.x if migrating from older code, or update to Scala 2.13/3.","message":"Version 3.x has breaking changes from 2.x; ensure compatibility with your Scala version (2.12).","severity":"breaking","affected_versions":">=3.0.0"}],"env_vars":null,"search_vec":"'abstract':5 'asynchron':7 'cat':1,15,17 'cats-effect':14 'concurr':9,19 'core':4 'effect':2,16,18 'function':21 'kernel':3 'program':10 'scala':12,20 'use':13","created_at":"2026-06-17T19:16:21.938703+00:00","updated_at":"2026-06-17T19:16:21.938703+00:00","problems":[],"ecosystem":"maven","meta_description":null,"install_score":null,"quickstart_score":null,"quickstart_tag":null,"pypi_latest":null,"cli_name":null,"cli_version":null,"type":"library","homepage":"https://github.com/typelevel/cats-effect","github":"https://github.com/typelevel/cats-effect","docs":"https://appdoc.app/artifact/org.typelevel/cats-effect-kernel_2.12/","changelog":null,"pypi":null,"npm":null,"openapi_spec":null,"status_page":null,"smithery":null,"categories":["utility"],"base_url":null,"auth_type":null,"provenance":{"verified_status":null,"verified_at":null,"last_verified":"2026-06-17","next_check":"2026-12-14","install_tag":null}}