Use :make | call vimspector#Launch() ? Make a custom command to do that ?

depending on the complexity, you can use a 'variable' to run a shell command prior to starting debugging, such as this:

{
   "configurations": {
      "test": {
        "variables":
        {
            "MAKE_IGNORED": { "shell": "make -C ${workspaceRoot} ${fileBasenameNoExtension}" }
        },
        ....
    }
}

I'm not going to implement a whole task system as that's way out of scope for this plugin.

You can do that with other things such as custom function, custom commands, mappings etc., or just a exit_cb on a job: job_start( ..., #{ ..., exit_cb: { id, status -> call vimspector#Launch() } } )

I'm not going to implement a whole task system as that's way out of scope for this plugin.

Completely agree

I forgot about the pipe in vim to run commands.

For anyone using Asynctask, here's my setup.
When using asynctask the pipe is ignored if you use the command
:AsyncTask ninja | call vimspector#Launch()
so you have to use this variant.
:execute 'AsyncTask ninja' | call vimspector#Launch()

you also have to set the mode in the the task config to vim which makes it synchronous and defeats the async part of the plugin but I mainly use it as a place to store common tasks.

My build task looks like this.

[configure_release]
command=cmake -GNinja -DCMAKE_EXPORT_COMPILE_COMMANDS=1 ..
cwd=$(VIM_ROOT)/build
save=2

[ninja]
command=ninja -C build
cwd=$(VIM_ROOT)
save=2

[sync-ninja]
command=ninja -C build
cwd=$(VIM_ROOT)
mode=vim
save=2

and I run the debugger with this :execute 'AsyncTask sync-ninja' | call vimspector#Launch()