toOffsetLimit

Converts backward pagination arguments to offset/limit.

• getLast determines the page size (defaults to defaultPageSize).
• getBefore cursor encodes the index of the first item on the next page; the offset and limit are computed to return the last items ending just before that position, clamped so the window never extends before index 0.
• If before is absent, a negative offset equal to -pageSize is returned, signalling fromList to resolve from the tail of the full list. Prefer toOffsetLimit with the total count when available.

Converts backward pagination arguments to offset/limit when the total count is known.

When getBefore is absent, this computes the offset as max(0, totalCount - last) to return the last N items from the dataset, avoiding the negative-offset signal used by toOffsetLimit. When before is present, totalCount is ignored and this delegates to toOffsetLimit.

Parameters