distanceToEnd

function · packages/primitives/src/state/virtual.ts:204

function distanceToEnd(
  model: VirtualModel,
  keys: ReadonlyArray<string>,
  viewportHeight: number,
): number

Pixels from the viewport's bottom edge to the content's end: negative past it, zero exactly there. Prefetch thresholds want this number ("load when within 500px"), not just the boolean below.