<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_yaml(value) -> str: """Convert a given value to a YAML string."""

    stream = yaml.io.StringIO()
    dumper = ConfigDumper(stream, default_flow_style=True, width=sys.maxsize)
    val = None
    try:
        dumper.open()
        dumper.represent(value)
        val = stream.getvalue().strip()
        dumper.close()
    finally:
        dumper.dispose()

    return val