In JavaScriptEngineSwitcher.ChakraCore.Native.win-x86, JavaScriptEngineSwitcher.ChakraCore.Native.win-x64 and JavaScriptEngineSwitcher.ChakraCore.Native.win8-arm packages solved the problem with duplication of the native assemblies in the bin directory of .NET Core application

Author: Taritsyn

NuGet/JavaScriptEngineSwitcher.ChakraCore.Native.win-x64/build/JavaScriptEngineSwitcher.ChakraCore.Native.win-x64.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-	<ItemGroup>
+	<ItemGroup Condition=" $(RuntimeFrameworkVersion) == '' ">
 		<None Include="$(MSBuildThisFileDirectory)..\runtimes\win7-x64\native\ChakraCore.dll">
 			<Link>x64\ChakraCore.dll</Link>
 			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>

NuGet/JavaScriptEngineSwitcher.ChakraCore.Native.win-x86/build/JavaScriptEngineSwitcher.ChakraCore.Native.win-x86.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-	<ItemGroup>
+	<ItemGroup Condition=" $(RuntimeFrameworkVersion) == '' ">
 		<None Include="$(MSBuildThisFileDirectory)..\runtimes\win7-x86\native\ChakraCore.dll">
 			<Link>x86\ChakraCore.dll</Link>
 			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>

NuGet/JavaScriptEngineSwitcher.ChakraCore.Native.win8-arm/build/JavaScriptEngineSwitcher.ChakraCore.Native.win8-arm.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-	<ItemGroup>
+	<ItemGroup Condition=" $(RuntimeFrameworkVersion) == '' ">
 		<None Include="$(MSBuildThisFileDirectory)..\runtimes\win8-arm\native\ChakraCore.dll">
 			<Link>arm\ChakraCore.dll</Link>
 			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>