Scala3 finishing touch

README.md

@@ -13,7 +13,7 @@ Installation
 
 Add the following dependency to your project's build file
 
-For Scala 2.12.x and 2.13.x
+For Scala 2.12.x, 2.13.x and 3.0.0
 
 ```scala
 "com.github.dapperware" %% "zio-slack-api-web" % "0.9.5"
@@ -94,4 +94,18 @@ object JokeApp extends App {
 }
 ```
 
+Caveat
+--
+
+With Scala 3.0.0, you might encounter a run time error similar to
+```
+Fiber failed.
+An unchecked error was produced.
+java.lang.Error: Defect in zio.Has: Set({{Has[=Token] & Has[=package$::SlackClient$::Service]} & Has[=package$::SlackRealtimeClient$::Service]}) statically known to be contained within the environment are missing
+	at zio.Has$HasSyntax$.prune$extension(Has.scala:198)
+	at zio.Has$HasSyntax$.union$extension(Has.scala:210)
+	at zio.Has$$anon$2.union(Has.scala:92)
+	at zio.Has$$anon$2.union(Has.scala:91)
 
+```
+The workaround for this is to use the environments explictely instead of using the type aliases. Replace `AccessToken` with `Has[Token]`, `ClientSecret` with `Has[ClientSecretToken]` and `SlackRealtimeClient` with `Has[SlackRealtimeClient.Service]`. The programs in the `examples` module compile and run with Scala 3.0.0.

examples/src/main/scala/basic/BasicApp.scala

@@ -9,8 +9,8 @@ import common.{ accessToken, default, Basic, BasicConfig }
 import sttp.client3.asynchttpclient.zio.AsyncHttpClientZioBackend
 import zio.console.{ putStrLn, Console }
 import zio.stream.ZStream
-import zio.{ App, ExitCode, Layer, ZIO, ZManaged }
-import com.github.dapperware.slack.AccessToken
+import zio.{ App, ExitCode, Layer, ZIO, ZManaged, Has }
+import com.github.dapperware.slack.{AccessToken, Token}
 
 object BasicApp extends App {
 
@@ -19,12 +19,12 @@ object BasicApp extends App {
   val slackClients: Layer[Throwable, SlackClient with SlackRealtimeClient] = 
     AsyncHttpClientZioBackend.layer() >>> (SlackClient.live ++ SlackRealtimeClient.live)
 
-  val layers: Layer[Throwable, SlackEnv with SlackRealtimeEnv with Basic] =
+  val layer: Layer[Throwable, Has[SlackClient.Service] with Has[Token] with Has[SlackRealtimeClient.Service] with Basic] =
     slackClients ++ accessTokenAndBasic
 
   override def run(args: List[String]): ZIO[zio.ZEnv, Nothing, ExitCode] =
     (for {
-      resp <- (testApi.toManaged_ <&> testRealtime).provideCustomLayer(layers)
+      resp <- (testApi.toManaged_ <&> testRealtime).provideCustomLayer(layer)
     } yield resp).use_(ZIO.unit).exitCode
 
   val testRealtime: ZManaged[SlackRealtimeEnv with Basic with Console, SlackError, Unit] =

examples/src/main/scala/chat/ChatApp.scala

@@ -4,13 +4,13 @@ import com.github.dapperware.slack.api.web.{ getConversationInfo, getUserInfo }
 import com.github.dapperware.slack.client.SlackClient
 import com.github.dapperware.slack.realtime.SlackRealtimeClient
 import com.github.dapperware.slack.realtime.models.{ Message, SendMessage }
-import com.github.dapperware.slack.{ realtime, AccessToken }
-import com.github.dapperware.slack.realtime.{ SlackRealtimeClient, SlackRealtimeEnv }
+import com.github.dapperware.slack.realtime
 import common.{ accessToken, default, Basic, BasicConfig }
 import sttp.client3.asynchttpclient.zio.AsyncHttpClientZioBackend
 import zio._
 import zio.console._
 import zio.stream.ZStream
+import com.github.dapperware.slack.Token
 
 /**
  * A simple interactive application to show how to use slack zio for much profit
@@ -34,12 +34,12 @@ object ChatApp extends App {
       t.replaceAllLiterally(s"<@$ref>", s"@$replace")
     }
 
-  val accessTokenAndBasic: Layer[Throwable, AccessToken with Basic] = default >+> accessToken.toLayer
+  val accessTokenAndBasic: Layer[Throwable, Has[Token] with Basic] = default >+> accessToken.toLayer
 
-  val slackClients: Layer[Throwable, SlackClient with SlackRealtimeClient] = 
+  val slackClients: Layer[Throwable, Has[SlackClient.Service] with Has[SlackRealtimeClient.Service]] = 
     AsyncHttpClientZioBackend.layer() >>> (SlackClient.live ++ SlackRealtimeClient.live)
 
-  private val layers: ZLayer[Any, Throwable, SlackRealtimeEnv with Basic] =
+  private val layers: ZLayer[Any, Throwable, Has[SlackClient.Service] with Has[SlackRealtimeClient.Service] with Has[Token] with Basic] =
     slackClients ++ accessTokenAndBasic
 
   override def run(args: List[String]): ZIO[zio.ZEnv, Nothing, ExitCode] = {

examples/src/main/scala/joke/JokeApp.scala

@@ -17,6 +17,7 @@ import zio.clock.Clock
 import zio.duration._
 import zio.random.Random
 import zio.stream.ZStream
+import com.github.dapperware.slack.Token
 
 /**
  * Every 3 hours, randomly pick a channel that the bot is part of and send a chuck norris joke to it.

examples/src/main/scala/search/SearchApp.scala

@@ -7,14 +7,14 @@ import common.{ accessToken, default, Basic }
 import sttp.client3.asynchttpclient.zio.AsyncHttpClientZioBackend
 import zio.console._
 import zio.stream.{ ZSink, ZStream }
-import zio.{ App, ExitCode, ZIO, Layer}
-import com.github.dapperware.slack.AccessToken
+import zio.{ App, ExitCode, ZIO, Layer, Has}
+import com.github.dapperware.slack.Token
 
 object SearchApp extends App {
 
-  val accessTokenAndBasic: Layer[Throwable, AccessToken with Basic] = default >+> accessToken.toLayer
+  val accessTokenAndBasic: Layer[Throwable, Has[Token] with Basic] = default >+> accessToken.toLayer
 
-  val slackClients: Layer[Throwable, SlackClient with SlackRealtimeClient] = AsyncHttpClientZioBackend.layer() >>> (SlackClient.live ++ SlackRealtimeClient.live)
+  val slackClients: Layer[Throwable, Has[SlackClient.Service] with Has[SlackRealtimeClient.Service]] = AsyncHttpClientZioBackend.layer() >>> (SlackClient.live ++ SlackRealtimeClient.live)
 
   val layers = slackClients ++ accessTokenAndBasic