Function isTupleDataArray

src/core/createRenderCoordinator.ts:666–667

(data: ReadonlyArray<DataPoint>)

const isTuplePoint = (p: DataPoint): p is TuplePoint => Array.isArray(p);
const isTupleDataArray = (data: ReadonlyArray<DataPoint>): data is ReadonlyArray<TuplePoint> =>
  data.length > 0 && isTuplePoint(data[0]!);

// Cache monotonicity checks to avoid O(n) scans on every zoom operation.
const monotonicXCache = new WeakMap<ReadonlyArray<DataPoint>, boolean>();