{"id":55986,"library":"fs2-core-3","title":"FS2 Core","description":"FS2 is a functional streaming library for Scala providing purely functional, composable, and effectful streams.","status":"active","version":"3.13.0","language":"java","source_language":null,"source_url":"https://github.com/typelevel/fs2","tags":["scala","streaming","functional","fs2","cats"],"install":[{"cmd":"<dependency>\n  <groupId>co.fs2</groupId>\n  <artifactId>fs2-core_3</artifactId>\n  <version>3.13.0</version>\n</dependency>","lang":"xml","label":"Maven"},{"cmd":"implementation 'co.fs2:fs2-core_3:3.13.0'","lang":"groovy","label":"Gradle"}],"dependencies":[],"imports":[{"symbol":"Stream","correct":"fs2.Stream"}],"quickstart":{"code":"import fs2.Stream\nimport cats.effect.IO\nimport cats.effect.unsafe.implicits.global\n\nobject Fs2Example extends App {\n  val stream = Stream(1, 2, 3).evalMap(n => IO(println(n)))\n  stream.compile.drain.unsafeRunSync()\n}","lang":"scala","description":"Creates and runs a simple FS2 stream that prints numbers."},"warnings":[{"fix":"Use Cats Effect 3 and update imports accordingly.","message":"FS2 3.x uses Cats Effect 3; ensure compatibility with your project's effect system.","severity":"breaking","affected_versions":">=3.0.0"}],"env_vars":null,"search_vec":"'cat':22 'compos':14 'core':2 'effect':16 'fs2':1,3,21 'function':6,13,20 'librari':8 'provid':11 'pure':12 'scala':10,18 'stream':7,17,19","created_at":"2026-06-15T10:15:53.867770+00:00","updated_at":"2026-06-15T10:15:53.867770+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://typelevel.org/fs2","github":"https://github.com/typelevel/fs2","docs":"https://appdoc.app/artifact/co.fs2/fs2-core_3/","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}}