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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def watch(source_path, dest_path):
 """Watches for filesystem changes and compiles SCSS to CSS This is an async function. :param str source_path: The source directory to watch. All .scss files are monitored. :param str dest_path: The destination directory where the resulting CSS files should go. The filename will be identical to the original, except the extension will be `.css`. """

    # Setup Watchdog
    handler = FileSystemEvents(source_path, dest_path)

    # Always run initial compile
    handler.compile_scss()

    observer = Observer(timeout=5000)
    observer.schedule(handler, path=source_path, recursive=True)
    observer.start()