Function isTuplePoint

examples/annotations/main.ts:13–13

(p: DataPoint)

// Type guard for the tuple form of DataPoint. We define this explicitly because `Array.isArray(...)`
// narrows to `any[]`, which does not reliably narrow `readonly [...]` tuples in strict TS configs.
const isTuplePoint = (p: DataPoint): p is readonly [x: number, y: number, size?: number] => Array.isArray(p);

type DisposableResizeObserver = Pick<ResizeObserver, 'observe' | 'unobserve' | 'disconnect'>;