Hi!

I'm using VS Code to create some custom ROS tasks via setting in task.json.

Since I'm new to VS Code, I'm confused about some of the parameter in the following snippet

    {
        "type": "catkin",
        "args": [
            "clean",
            "--yes"
        ],
        "problemMatcher": [
            "$catkin-gcc"
        ],
        "label": "catkin_clean"
    }

(1) I understand that the task's type is shell and the command is interpreted as a shell command. But what does type: catkin mean? Does that mean this task inherits the catkin command?

(2) What is the use of "problemMatcher": ["$catkin-gcc"]? How to intuitively discover this utility？

Thanks!