Use case

I want to test my web app when it runs in a subfolder. When I build the web app, I can use the flag --base-href to supply the correct subfolder the web app will be hosted at. This flag is however not available for the flutter run command.

In VS Code I have the following configuration

{
    "name": "portal (in subfolder)",
    "type": "dart",
    "request": "launch",
    "program": "clients/portal/lib/main.dart",
    "args": [
        "--web-launch-url=http://localhost:8080/preview",
        "--web-port=8080",
        "--web-browser-flag=--disable-web-security",
    ]
},

Adding --base-href=/preview/ as an argument results in the error:
Could not find an option named "base-href".

Proposal

Add --base-href to the flutter run command.

Or maybe consider to support all flags that are supported by flutter build command, if that makes sense.