The Linux platform code for your plugin is located in
flutter/ephemeral/.plugin_symlinks/hello/linux/.

You can run the example app using flutter run.
Note: Creating a runnable Flutter application
on Linux requires steps that are part of the flutter
tool, so even if your editor provides CMake
integration building and running that way won’t
work correctly.

Step 2e: Add macOS platform code (.swift)

We recommend you edit the macOS code using Xcode.

Before editing the macOS platform code in Xcode,
first make sure that the code has been built at least once
(in other words, run the example app from your IDE/editor,
or in a terminal execute
cd hello/example; flutter build macos).

Then use the following steps:

Launch Xcode.

Select File > Open, and select the
hello/example/macos/Runner.xcworkspace file.