Microsoft.AspNetCore.Components.WebAssembly.props

<Project>
  <PropertyGroup>
    <BlazorWebAssemblyJSPath>$(MSBuildThisFileDirectory)blazor.webassembly.js</BlazorWebAssemblyJSPath>
    <BlazorRoutingEnableRegexConstraint Condition="'$(BlazorRoutingEnableRegexConstraint)' == ''">false</BlazorRoutingEnableRegexConstraint>
  </PropertyGroup>

  <ItemGroup>
    <RuntimeHostConfigurationOption Include="Microsoft.AspNetCore.Components.Routing.RegexConstraintSupport"
      Condition="'$(BlazorRoutingEnableRegexConstraint)' != ''"
      Value="$(BlazorRoutingEnableRegexConstraint)"
      Trim="true" />
  </ItemGroup>

  <ItemGroup>
    <AssemblyAttribute Include="System.Reflection.AssemblyMetadataAttribute" Condition="'$(BlazorRoutingEnableRegexConstraint)' == 'true'">
      <_Parameter1>Microsoft.AspNetCore.Components.Routing.RegexConstraintSupport</_Parameter1>
      <_Parameter2>true</_Parameter2>
    </AssemblyAttribute>
  </ItemGroup>

</Project>