in shared/productTypes.ts [253:267]
export function getBillingPeriodAdjective(
billingPeriod?: BillingPeriod,
): 'Monthly' | 'Annual' | 'Quarterly' {
if (billingPeriod === 'month') {
return 'Monthly';
}
if (billingPeriod === 'year') {
return 'Annual';
}
if (billingPeriod === 'quarter') {
return 'Quarterly';
}
throw new Error('No billing period for subscription');
}