While developing Angular applications in Visual Studio 2019 & Visual Studio Code following compile time error is shown:

TS1219 Experimental support for decorators is a feature that is subject to change in a future release. Specify ‘–experimentalDecorators’ to remove this warning.

Visual Studio Fix:

I am using Visual Studio 2019 and fixed the issue in it, it might work in other versions as well.

Add the following lines in .csproj file:

  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|AnyCPU'">    
    <TypeScriptExperimentalDecorators>True</TypeScriptExperimentalDecorators>
    <TypeScriptEmitDecoratorMetadata>True</TypeScriptEmitDecoratorMetadata>