Function isTupleDataPoint

src/data/lttbSample.ts:3–6

(point: DataPoint)

import type { DataPoint, DataPointTuple } from '../config/types';

function isTupleDataPoint(point: DataPoint): point is DataPointTuple {
  // `DataPoint` uses a readonly tuple; `Array.isArray` doesn't narrow it well without a predicate.
  return Array.isArray(point);
}

function lttbIndicesForInterleavedXY(data: Float32Array, targetPoints: number): Int32Array {
  const n = data.length >>> 1; // floor(length / 2)