interface Transformer
optional
flush: TransformerFlushCallback<O>optional
readableType: undefinedoptional
start: TransformerStartCallback<O>optional
transform: TransformerTransformCallback<I, O>optional
writableType: undefinedflush: TransformerFlushCallback<O>readableType: undefinedstart: TransformerStartCallback<O>transform: TransformerTransformCallback<I, O>writableType: undefined