diff --git a/libraries/scripting/common/src/kotlin/script/experimental/api/scriptCompilation.kt b/libraries/scripting/common/src/kotlin/script/experimental/api/scriptCompilation.kt
index 99d59f7e7f4..7e77aad4fb7 100644
--- a/libraries/scripting/common/src/kotlin/script/experimental/api/scriptCompilation.kt
+++ b/libraries/scripting/common/src/kotlin/script/experimental/api/scriptCompilation.kt
@@ -90,13 +90,18 @@ val ScriptCompilationConfigurationKeys.compilerOptions by PropertiesCollection.k
 /**
  * The callback that will be called on the script compilation before parsing the script
  */
-val ScriptCompilationConfigurationKeys.refineConfigurationBeforeParsing by PropertiesCollection.key<RefineConfigurationBeforeParsingData>()
+val ScriptCompilationConfigurationKeys.refineConfigurationBeforeParsing by PropertiesCollection.key<RefineConfigurationUnconditionallyData>()
 
 /**
  * The callback that will be called on the script compilation after parsing script file annotations
  */
 val ScriptCompilationConfigurationKeys.refineConfigurationOnAnnotations by PropertiesCollection.key<RefineConfigurationOnAnnotationsData>()
 
+/**
+ * The callback that will be called on the script compilation immediately before starting the compilation
+ */
+val ScriptCompilationConfigurationKeys.refineConfigurationBeforeCompiling by PropertiesCollection.key<RefineConfigurationUnconditionallyData>()
+
 /**
  * The list of script fragments that should be compiled intead of the whole text
  * (for use primary with the refinement callbacks)
@@ -116,7 +121,7 @@ class RefineConfigurationBuilder : PropertiesCollection.Builder() {
      * @param handler the callback that will be called
      */
     fun beforeParsing(handler: RefineScriptCompilationConfigurationHandler) {
-        set(ScriptCompilationConfiguration.refineConfigurationBeforeParsing, RefineConfigurationBeforeParsingData(handler))
+        set(ScriptCompilationConfiguration.refineConfigurationBeforeParsing, RefineConfigurationUnconditionallyData(handler))
     }
 
     /**
@@ -125,6 +130,7 @@ class RefineConfigurationBuilder : PropertiesCollection.Builder() {
      * @param handler the callback that will be called
      */
     fun onAnnotations(annotations: List<KotlinType>, handler: RefineScriptCompilationConfigurationHandler) {
+        // TODO: implement handlers composition
         set(ScriptCompilationConfiguration.refineConfigurationOnAnnotations, RefineConfigurationOnAnnotationsData(annotations, handler))
     }
 
@@ -139,7 +145,7 @@ class RefineConfigurationBuilder : PropertiesCollection.Builder() {
 
     /**
      * The callback that will be called on the script compilation after parsing script file annotations
-     * @param annotations the list of annotations to trigger the callback on
+     * @param T the annotation to trigger the callback on
      * @param handler the callback that will be called
      */
     inline fun <reified T : Annotation> onAnnotations(noinline handler: RefineScriptCompilationConfigurationHandler) {
@@ -163,6 +169,14 @@ class RefineConfigurationBuilder : PropertiesCollection.Builder() {
     fun onAnnotations(annotations: Iterable<KClass<out Annotation>>, handler: RefineScriptCompilationConfigurationHandler) {
         onAnnotations(annotations.map { KotlinType(it) }, handler)
     }
+
+    /**
+     * The callback that will be called on the script compilation  immediately before starting the compilation
+     * @param handler the callback that will be called
+     */
+    fun beforeCompiling(handler: RefineScriptCompilationConfigurationHandler) {
+        set(ScriptCompilationConfiguration.refineConfigurationBeforeCompiling, RefineConfigurationUnconditionallyData(handler))
+    }
 }
 
 /**
@@ -171,7 +185,7 @@ class RefineConfigurationBuilder : PropertiesCollection.Builder() {
 typealias RefineScriptCompilationConfigurationHandler =
             (ScriptConfigurationRefinementContext) -> ResultWithDiagnostics<ScriptCompilationConfiguration>
 
-class RefineConfigurationBeforeParsingData(
+class RefineConfigurationUnconditionallyData(
     val handler: RefineScriptCompilationConfigurationHandler
 ) : Serializable
 
diff --git a/libraries/scripting/jvm/src/kotlin/script/experimental/jvm/impl/BridgeDependenciesResolver.kt b/libraries/scripting/jvm/src/kotlin/script/experimental/jvm/impl/BridgeDependenciesResolver.kt
index ebc81d8645a..cd256927407 100644
--- a/libraries/scripting/jvm/src/kotlin/script/experimental/jvm/impl/BridgeDependenciesResolver.kt
+++ b/libraries/scripting/jvm/src/kotlin/script/experimental/jvm/impl/BridgeDependenciesResolver.kt
@@ -44,19 +44,22 @@ class BridgeDependenciesResolver(
 
             val defaultImports = scriptCompilationConfiguration[ScriptCompilationConfiguration.defaultImports]?.toList() ?: emptyList()
 
-            val refineFn = scriptCompilationConfiguration[ScriptCompilationConfiguration.refineConfigurationOnAnnotations]?.handler
-                ?: return DependenciesResolver.ResolveResult.Success(
-                    ScriptDependencies(
-                        classpath = oldClasspath,
-                        sources = scriptCompilationConfiguration[ScriptCompilationConfiguration.ide.dependenciesSources].toClassPathOrEmpty(),
-                        imports = defaultImports
-                    ),
-                    diagnostics
-                )
-
-            val refineResults = refineFn(
-                ScriptConfigurationRefinementContext(scriptContents.toScriptSource(), scriptCompilationConfiguration, processedScriptData)
+            fun ScriptCompilationConfiguration.toDependencies(classpath: List<File>): ScriptDependencies = ScriptDependencies(
+                classpath = classpath,
+                sources = this[ScriptCompilationConfiguration.ide.dependenciesSources].toClassPathOrEmpty(),
+                imports = defaultImports
             )
+
+            val refineResults = scriptCompilationConfiguration.refineWith(
+                scriptCompilationConfiguration[ScriptCompilationConfiguration.refineConfigurationOnAnnotations]?.handler,
+                scriptContents, processedScriptData
+            ).onSuccess {
+                it.refineWith(
+                    scriptCompilationConfiguration[ScriptCompilationConfiguration.refineConfigurationBeforeCompiling]?.handler,
+                    scriptContents, processedScriptData
+                )
+            }
+
             val refinedConfiguration = when (refineResults) {
                 is ResultWithDiagnostics.Failure ->
                     return DependenciesResolver.ResolveResult.Failure(refineResults.reports.mapScriptReportsToDiagnostics())
@@ -98,3 +101,20 @@ internal fun ScriptContents.toScriptSource(): SourceCode = when {
 }
 
 internal fun List<ScriptDependency>?.toClassPathOrEmpty() = this?.flatMap { (it as JvmDependency).classpath } ?: emptyList()
+
+internal fun List<SourceCode>?.toFilesOrEmpty() = this?.map {
+    val externalSource = it as? ExternalSourceCode
+    externalSource?.externalLocation?.toFile()
+        ?: throw RuntimeException("Unsupported source in requireSources parameter - only local files are supported now (${externalSource?.externalLocation})")
+} ?: emptyList()
+
+fun ScriptCompilationConfiguration.refineWith(
+    handler: RefineScriptCompilationConfigurationHandler?, scriptContents: ScriptContents, processedScriptData: ScriptCollectedData
+): ResultWithDiagnostics<ScriptCompilationConfiguration> {
+
+    if (handler == null) return this.asSuccess()
+
+    return handler(
+        ScriptConfigurationRefinementContext(scriptContents.toScriptSource(), this, processedScriptData)
+    )
+}
\ No newline at end of file