def stream_head
import cswap-bend-cli@0.1.0.0/fmt/out.bend as Outimport Base
import cswap-bend-cli@0.1.0.0/fmt/shape.bend as Shape
159# Printed once before the first event (CSV: the header line).
160def stream_head(f: Fmt) -> String:
161 match f:
162 case FCsv{}:
163 Shape.event_header()
164 case _:
165 ""