import { type PeriodicWave } from "https://deno.land/x/evt@v2.4.7/lib/types/lib.dom.ts";
PeriodicWave has no inputs or outputs; it is used to define custom oscillators when calling OscillatorNode.setPeriodicWave(). The PeriodicWave itself is created/returned by AudioContext.createPeriodicWave().