{"id":54398,"library":"cats-effect-2-13","title":"Cats Effect","description":"A purely functional runtime system for Scala, providing abstractions for asynchronous and concurrent programming.","status":"active","version":"3.7.0","language":"java","source_language":null,"source_url":"https://github.com/typelevel/cats-effect","tags":["cats","effect","functional","scala"],"install":[{"cmd":"<dependency>\n  <groupId>org.typelevel</groupId>\n  <artifactId>cats-effect_2.13</artifactId>\n  <version>3.7.0</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'org.typelevel:cats-effect_2.13:3.7.0'","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":"Creates and runs a simple IO program that prints a message."},"warnings":[{"fix":"Use cats-effect 3.x for new projects; migrate from 2.x using official migration guide.","message":"Cats Effect 3.x has breaking changes from 2.x","severity":"breaking","affected_versions":"2.x"}],"env_vars":null,"search_vec":"'abstract':11 'asynchron':13 'cat':1,17 'concurr':15 'effect':2,18 'function':5,19 'program':16 'provid':10 'pure':4 'runtim':6 'scala':9,20 'system':7","created_at":"2026-06-15T09:04:01.027329+00:00","updated_at":"2026-06-15T09:04:01.027329+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_2.13/","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":"2026-06-15","next_check":"2026-12-12","install_tag":null}}