object circe is not a member of package io

Question

I am trying to create a predef.sc file for ammonite REPL. This is what I have written

val fs2Version = "2.2.2"
val circeVersion = "0.13.0"

// fs2
interp.load.ivy("co.fs2" %% "fs2-core" % fs2Version)
import scala.collection.immutable.{Stream => _}
import scala.{Stream => _}
import _root_.fs2._

// circe
interp.load.ivy("io.circe" %% "circe-core" % circeVersion)
interp.load.ivy("io.circe" %% "circe-parser" % circeVersion)
interp.load.ivy("io.circe" %% "circe-generic" % circeVersion)
import _root_.io.circe._, _root_.io.circe.parser._, _root_.io.circe.syntax._, _root_.io.circe.optics.JsonPath._, _root_.io.circe.generic.auto._

But it gives me an error saying

object circe is not a member of package io

I think its because fs2 also has a sub package called "io"

user_16222213 · Answer

If you are using Intellij checkout this question How to force IntelliJ IDEA to reload dependencies from build.sbt after they changed? it did work for me and I was having your same error.

Or if you are using VSCode see this https://scalameta.org/metals/docs/editors/vscode/ you basically have to Ctrl + Shift + P and type import build but you gonna need the Scala (Metals) extension to do that.

user_266956 · Answer

Works for me with the following predef.sc file:

import $ivy.`org.typelevel::cats-core:2.1.1`, cats._, cats.implicits._
import $ivy.`org.typelevel::cats-effect:2.1.1`
import $ivy.`co.fs2::fs2-core:2.2.2`
import $ivy.`io.circe::circe-core:0.13.0`
import $ivy.`io.circe::circe-parser:0.13.0`
import $ivy.`io.circe::circe-generic:0.13.0`
import $ivy.`io.circe::circe-optics:0.13.0`
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.duration._
import scala.concurrent.Future
import scala.util.{Failure, Success}
import scala.concurrent.Await

import scala.collection.immutable.{Stream => _}
import scala.{Stream => _}
import _root_.fs2._

import _root_.io.circe._, _root_.io.circe.parser._, _root_.io.circe.syntax._, _root_.io.circe.optics.JsonPath._, _root_.io.circe.generic.auto._

and all your imports after this

object circe is not a member of package io

2 Answers