DataTransition
type DataTransition = "initial" | "stream" | "timeframe" | "reset";
Source: react-native/src/dataTransitions.ts:18
How a new candles array relates to the one the chart already holds:
'initial' is the first data, 'stream' a live update to the same series,
'timeframe' the same asset re-bucketed into a different interval, and
'reset' a different series entirely.