Publish ContractsDsl

- Mark @ContractsDsl as @Experimental
- Move Contracts DSL out from 'internal' package
- Change visibility of ContractsDsl from 'internal' to 'public'

^KT-25274 Fixed
^KT-25495 Fixed

libraries/stdlib/js/build.gradle

@@ -149,6 +149,7 @@ compileKotlin2Js {
         freeCompilerArgs += [
             "-source-map-base-dirs", [builtinsSrcDir, jsSrcDir, commonSrcDir, commonSrcDir2].collect { file(it).absoluteFile }.join(File.pathSeparator),
             "-Xuse-experimental=kotlin.Experimental",
+            "-Xuse-experimental=kotlin.contracts.ExperimentalContracts",
             "-XXLanguage:+InlineClasses",
             "-XXLanguage:-ReleaseCoroutines"
         ]
@@ -174,6 +175,9 @@ compileCoroutinesKotlin2Js {
         outputFile = "${buildDir}/classes/coroutines/kotlin.js"
         sourceMap = true
         sourceMapPrefix = "./"
+        freeCompilerArgs += [
+            "-Xuse-experimental=kotlin.contracts.ExperimentalContracts"
+        ]
     }
 }
 

libraries/stdlib/js/src/kotlin/concurrent.kt

@@ -5,7 +5,7 @@
 
 package kotlin
 
-import kotlin.internal.contracts.*
+import kotlin.contracts.*
 
 
 @Deprecated("Use Synchronized annotation from kotlin.jvm package", ReplaceWith("kotlin.jvm.Synchronized"), level = DeprecationLevel.WARNING)