Add blocking to MonadError

Author: adamw

build.sbt

@@ -1,4 +1,5 @@
 import com.softwaremill.SbtSoftwareMillBrowserTestJS._
+import com.typesafe.tools.mima.core._
 
 val scala2_11 = "2.11.12"
 val scala2_12 = "2.12.13"
@@ -97,7 +98,13 @@ lazy val rootProject = (project in file("."))
 
 lazy val core = (projectMatrix in file("core"))
   .settings(
-    name := "core"
+    name := "core",
+    mimaBinaryIssueFilters ++= {
+      if (scalaVersion.value == scala2_11) {
+        // excluding this for 2.11 as the `blocking` method will only ever be called in recompiled library code
+        Seq(ProblemFilters.exclude[ReversedMissingMethodProblem]("sttp.monad.MonadError.blocking"))
+      } else Nil
+    }
   )
   .jvmPlatform(
     scalaVersions = scala2 ++ scala3,

core/src/main/scala/sttp/monad/MonadError.scala

@@ -43,6 +43,8 @@ trait MonadError[F[_]] {
     }
 
   def ensure[T](f: F[T], e: => F[Unit]): F[T]
+
+  def blocking[T](t: => T): F[T] = eval(t)
 }
 
 trait MonadAsyncError[F[_]] extends MonadError[F] {
@@ -162,4 +164,6 @@ class FutureMonad(implicit ec: ExecutionContext) extends MonadAsyncError[Future]
     }
     p.future
   }
+
+  override def blocking[T](t: => T): Future[T] = Future(scala.concurrent.blocking(t))
 }