diff --git a/src/Fable.Compiler.Service/Fable.Compiler.Service.fsproj b/src/Fable.Compiler.Service/Fable.Compiler.Service.fsproj
index cf74752383..ae56b11389 100644
--- a/src/Fable.Compiler.Service/Fable.Compiler.Service.fsproj
+++ b/src/Fable.Compiler.Service/Fable.Compiler.Service.fsproj
@@ -22,8 +22,10 @@
     </ItemGroup>
 
     <ItemGroup>
-        <Reference Include="../../lib/fcs/FSharp.Core.dll"/>
-        <Reference Include="../../lib/fcs/FSharp.Compiler.Service.dll"/>
+        <Reference Include="C:\Users\nojaf\Projects\fsharp\artifacts\bin\FSharp.Core\Release\netstandard2.0\FSharp.Core.dll" />
+        <Reference Include="C:\Users\nojaf\Projects\fsharp\artifacts\bin\FSharp.Compiler.Service\Release\netstandard2.0\FSharp.Compiler.Service.dll" />
+<!--        <Reference Include="../../lib/fcs/FSharp.Core.dll"/>-->
+<!--        <Reference Include="../../lib/fcs/FSharp.Compiler.Service.dll"/>-->
     </ItemGroup>
 
     <ItemGroup>
diff --git a/src/Fable.Compiler.Service/Library.fs b/src/Fable.Compiler.Service/Library.fs
index 5062c3186a..9df9ea349b 100644
--- a/src/Fable.Compiler.Service/Library.fs
+++ b/src/Fable.Compiler.Service/Library.fs
@@ -30,8 +30,7 @@ type BabelWriter
     let sb = StringBuilder()
     // let mapGenerator = lazy (SourceMapSharp.SourceMapGenerator(?sourceRoot = cliArgs.SourceMapsRoot))
 
-    override x.ToString() =
-        sb.ToString()
+    override x.ToString() = sb.ToString()
 
     interface Printer.Writer with
         // Don't dispose the stream here because we need to access the memory stream to check if file has changed
@@ -98,18 +97,23 @@ type BabelWriter
 //         let sourcePath = defaultArg file sourcePath |> Path.getRelativeFileOrDirPath false targetPath false
 //         mapGenerator.Force().AddMapping(generated, original, source=sourcePath, ?name=displayName)
 
+// TODO: real bad code, refactor
+let mutable checker = Unchecked.defaultof<InteractiveChecker>
+
 let mkCompilerForFile
     (cliArgs: CliArgs)
     (crackerResponse: CrackerResponse)
     (currentFile: string)
     : Async<Compiler> =
     async {
-        let checker = InteractiveChecker.Create(crackerResponse.ProjectOptions)
+        checker <- InteractiveChecker.Create(crackerResponse.ProjectOptions)
         let! assemblies = checker.GetImportedAssemblies()
 
-        let sourceReader _ =
+        let sourceReader fileName =
             let source =
-                Array.last crackerResponse.ProjectOptions.SourceFiles
+                Array.find
+                    (fun sourceFile -> sourceFile = fileName)
+                    crackerResponse.ProjectOptions.SourceFiles
                 |> System.IO.File.ReadAllText
 
             1, lazy source
@@ -119,7 +123,7 @@ let mkCompilerForFile
                 cliArgs.ProjectFile,
                 crackerResponse.ProjectOptions.SourceFiles,
                 sourceReader,
-                Array.last crackerResponse.ProjectOptions.SourceFiles
+                currentFile
             )
 
         ignore checkProjectResult.Diagnostics
@@ -172,5 +176,18 @@ let compileFile (com: Compiler) (pathResolver: PathResolver) (outPath: string) =
             )
 
         do! BabelPrinter.run writer babel
-        return writer.ToString()
+        let output = writer.ToString()
+
+        let sourceReader fileName =
+            let source =
+                Array.find
+                    (fun sourceFile -> sourceFile = fileName)
+                    com.SourceFiles
+                |> System.IO.File.ReadAllText
+
+            1, lazy source
+
+        let! dependentFiles = checker.GetDependentFiles(com.CurrentFile, com.SourceFiles, sourceReader)
+
+        return output, dependentFiles
     }
diff --git a/src/Fable.Compiler.Service/Library.fsi b/src/Fable.Compiler.Service/Library.fsi
index e8374fdaf6..b14ffb154a 100644
--- a/src/Fable.Compiler.Service/Library.fsi
+++ b/src/Fable.Compiler.Service/Library.fsi
@@ -5,4 +5,4 @@ open Fable.Compiler.Service.Util
 open Fable.Compiler.Service.ProjectCracker
 
 val mkCompilerForFile: cliArgs: CliArgs -> crackerResponse: CrackerResponse -> currentFile: string -> Async<Compiler>
-val compileFile: com: Compiler  -> pathResolver: PathResolver -> outPath: string -> Async<string>
+val compileFile: com: Compiler  -> pathResolver: PathResolver -> outPath: string -> Async<string * string array>
diff --git a/tests/FCSTest/FCSTest.fsproj b/tests/FCSTest/FCSTest.fsproj
index 4d3f0b2816..0b417f4d3a 100644
--- a/tests/FCSTest/FCSTest.fsproj
+++ b/tests/FCSTest/FCSTest.fsproj
@@ -14,8 +14,10 @@
     </ItemGroup>
 
     <ItemGroup>
-        <Reference Include="../../lib/fcs/FSharp.Core.dll"/>
-        <Reference Include="../../lib/fcs/FSharp.Compiler.Service.dll"/>
+        <Reference Include="C:\Users\nojaf\Projects\fsharp\artifacts\bin\FSharp.Core\Release\netstandard2.0\FSharp.Core.dll" />
+        <Reference Include="C:\Users\nojaf\Projects\fsharp\artifacts\bin\FSharp.Compiler.Service\Release\netstandard2.0\FSharp.Compiler.Service.dll" />
+<!--        <Reference Include="../../lib/fcs/FSharp.Core.dll"/>-->
+<!--        <Reference Include="../../lib/fcs/FSharp.Compiler.Service.dll"/>-->
     </ItemGroup>
 
 </Project>
diff --git a/tests/FCSTest/Program.fs b/tests/FCSTest/Program.fs
index 28a69aff1b..05576eddfe 100644
--- a/tests/FCSTest/Program.fs
+++ b/tests/FCSTest/Program.fs
@@ -26,8 +26,12 @@ module CoolCatProjectCracking =
             |> Array.choose (fun (line: string) ->
                 let filePath = Path.Combine(projectDir, line)
 
-                if isFSharpFile line && File.Exists filePath then
-                    Some filePath
+                if
+                    isFSharpFile line
+                    && File.Exists filePath
+                    && not (filePath.Contains "obj")
+                then
+                    Some (Path.normalizeFullPath filePath)
                 else
                     None
             )
@@ -170,7 +174,7 @@ let compilerForFile =
     mkCompilerForFile
         cliArgs
         crackerResponse
-        @"C:\Users\nojaf\Projects\MyFableApp\App.fs"
+        (Path.normalizeFullPath @"C:\Users\nojaf\Projects\MyFableApp\Lib.fs")
     |> Async.RunSynchronously
 
 let dummyPathResolver =
@@ -179,11 +183,12 @@ let dummyPathResolver =
         member _.GetOrAddDeduplicateTargetDir(_importDir, _addTargetDir) = ""
     }
 
-let javascript =
+let javascript, dependentFiles =
     compileFile
         compilerForFile
         dummyPathResolver
-        @"C:\Users\nojaf\Projects\MyFableApp\App.js"
+        @"C:\Users\nojaf\Projects\MyFableApp\Lib.js"
     |> Async.RunSynchronously
 
 printfn "this is javascript:\n%s" javascript
+printfn "these files need to be reprocessed: %s" (String.concat "," dependentFiles)