Function takeBillableUnits

packages/ai-fal/src/utils/billing.ts:65–72

(
  requestId: string | undefined,
)

 * keeps the registry from growing across the lifetime of the process.
 */
export function takeBillableUnits(
  requestId: string | undefined,
): number | undefined {
  if (!requestId) return undefined
  const units = billableUnitsByRequestId.get(requestId)
  if (units !== undefined) billableUnitsByRequestId.delete(requestId)
  return units
}

/**
 * Build a {@link TokenUsage} carrying fal's billed quantity. Media generation has