Define a task.

task("prepare", "echo preparing...");
task("counter", "deno counter.ts");
task("thumb", "deno https://deno.land/thumb.ts");
task("all", "$prepare", ["$counter alice", "$counter bob"], "$thumb");
            ^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  ^^^^^^^^
            1st task    2nd task (parallel)                 3rd task

• Use $name to call other tasks. You can also pass arguments.
• Use array to run commands in parallel.

Add file watcher. Usage is the same as https://github.com/jinjor/deno-watch.

task("compile", "echo changed", "$all").watchSync("src", options);
task("dev-server", "echo restarting...", "$server").watch("server");

• watchSync waits for running tasks, while watch does not.
• watch kills processes if they are running.