interface OptionalEffectTimingimport { type OptionalEffectTiming } from "https://deno.land/x/evt@v2.4.13/lib/types/lib.dom.ts"; Propertiesoptionaldelay: numberoptionaldirection: PlaybackDirectionoptionalduration: number | stringoptionaleasing: stringoptionalendDelay: numberoptionalfill: FillModeoptionaliterationStart: numberoptionaliterations: number