.NET SpaProxyLaunchCommand 不支援 pnpm 解決辦法

.NET 專案如果用 SpaProxyLaunchCommand 搭配上 pnpm 會出現錯誤的狀況，

設定檔：

<PropertyGroup>
        <TargetFramework>net8.0</TargetFramework>
        <IsPackable>false</IsPackable>
        <Nullable>enable</Nullable>
        <ImplicitUsings>enable</ImplicitUsings>
        <LangVersion>default</LangVersion>
        <!-- SPA settings -->
        <SpaRoot>ClientApp\</SpaRoot>
        <DefaultItemExcludes>$(DefaultItemExcludes);$(SpaRoot)node_modules\**</DefaultItemExcludes>
        <SpaProxyServerUrl>http://localhost:9000</SpaProxyServerUrl>
        <SpaProxyLaunchCommand>pnpm dev</SpaProxyLaunchCommand>

會出現以下錯誤：

info: Microsoft.AspNetCore.SpaProxy.SpaProxyLaunchManager[0]
      No SPA development server running at https://localhost:5173 found.
fail: Microsoft.AspNetCore.SpaProxy.SpaProxyLaunchManager[0]
      Failed to launch the SPA development server 'pnpm dev'.
      System.ComponentModel.Win32Exception (2): An error occurred trying to start process 'pnpm.cmd' with working directory 'C:\project\client-app\'. 지정된 파일을 찾을 수 없습니다.
         at System.Diagnostics.Process.StartWithShellExecuteEx(ProcessStartInfo startInfo)
         at System.Diagnostics.Process.Start(ProcessStartInfo startInfo)
         at Microsoft.AspNetCore.SpaProxy.SpaProxyLaunchManager.LaunchDevelopmentProxy()
fail: Microsoft.AspNetCore.SpaProxy.SpaProxyLaunchManager[0]
      Couldn't start the SPA development server with command 'pnpm dev'.
info: Microsoft.AspNetCore.SpaProxy.SpaProxyMiddleware[0]
      SPA proxy is not ready. Returning temporary landing page.

會出現這錯誤主要原因是因為使用了 pnpm 官方獨立安裝的方法安裝 pnpm 所產生的，如果使用 npm i -g pnpm 安裝倒是可以正常使用。

目前官方已知此問題但修正應該排到很後面了，但有網友給出了一個 workaround，利用 <SpaProxyLaunchCommand> 去叫起一個 shell 來解決：

    <SpaProxyLaunchCommand>pnpm i &amp;&amp; pnpm dev</SpaProxyLaunchCommand>
    <SpaProxyLaunchCommand Condition="$([MSBuild]::IsOsPlatform('Windows'))">cmd.exe /s /c $(SpaProxyLaunchCommand)</SpaProxyLaunchCommand>
    <SpaProxyLaunchCommand Condition="$([MSBuild]::IsOSUnixLike())">sh -c '$(SpaProxyLaunchCommand)'</SpaProxyLaunchCommand>

Ref:

• Support pnpm that installed using a standalone script in SpaProxyLaunchCommand