Various fixes

src/index.ts

@@ -80,6 +80,14 @@ export {
 	NON_PCM_AUDIO_CODECS,
 	SUBTITLE_CODECS,
 } from './codec';
+export {
+	canDecode,
+	canDecodeVideo,
+	canDecodeAudio,
+	getDecodableCodecs,
+	getDecodableVideoCodecs,
+	getDecodableAudioCodecs,
+} from './decode';
 export {
 	VideoEncodingConfig,
 	VideoEncodingAdditionalOptions,
@@ -119,6 +127,7 @@ export {
 	Rational,
 	Rectangle,
 	Rotation,
+	SetOptional,
 	SetRequired,
 	asc,
 	desc,