• There are 133 files with units, with 26,723 lines of code.
• 0 very complex files (McCabe index sum 251+; 0 lines of code)
• 0 complex files (McCabe index sum 126-250; 0 lines of code)
• 2 medium complex files (McCabe index sum 51-125; 696 lines of code)
• 5 slightly complex files (McCabe index sum 26-50; 1,268 lines of code)
• 126 simple files (McCabe index sum 1-25; 24,759 lines of code)
• 460 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
suggestedAmounts.ts in client/utilities/pricingConfig	356	12	98	28	15
testProducts.ts in client/fixtures/productBuilder	340	53	53	16	1
productResponse.ts in shared	403	7	47	12	26
productBuilder.ts in client/fixtures/productBuilder	215	25	46	21	6
mockServiceWorker.js in .storybook/static	227	11	39	17	11
upgradeProductPaymentCopy.ts in client/utilities	208	15	29	14	4
user.ts in client/components/mma/identity/idapi	215	14	28	13	2
identityMiddleware.ts in server/middleware	281	5	25	9	8
stripeCardInputForm.tsx in client/components/mma/paymentUpdate/card	303	3	25	8	19
Billing.tsx in client/components/mma/billing	440	7	23	5	13
oauth.ts in server	296	19	22	7	4
DefaultApiResponseHandler.tsx in client/components/mma/shared/asyncComponents	86	7	21	24	4
utils.ts in client/utilities	85	7	18	21	4
AsyncLoader.tsx in client/components/mma/shared	131	3	17	13	7
baseProducts.ts in client/fixtures/productBuilder	1244	17	17	1	1
ContributionUpdateAmountForm.tsx in client/components/mma/accountoverview/updateAmount	403	2	13	3	10
mpapiResponse.ts in shared	54	4	12	22	8
identity.ts in client/components/mma/identity	129	8	12	9	3
ProductCardSections.tsx in client/components/mma/accountoverview	752	3	11	1	9
useFetch.ts in client/utilities/hooks	68	1	10	15	10
UpgradeSupportAmountForm.tsx in client/components/mma/upgrade	240	3	10	4	7
SupporterPlusUpdateAmountForm.tsx in client/components/mma/accountoverview/updateAmount	386	1	10	3	10
productTypes.ts in shared	925	6	9	1	4
useExtraAccounts.ts in client/utilities/hooks	383	5	9	2	2
apiProxy.ts in server	187	4	8	4	3
HolidayStopApi.ts in client/components/mma/holiday	195	4	7	4	2
UpgradeProduct.stories.tsx in client/components/mma/upgradeProduct	361	7	7	2	1
DirectDebitInputForm.tsx in client/components/mma/paymentUpdate/dd	257	2	7	3	5
fulfilmentDateCalculatorReader.ts in server	91	1	6	7	6
dates.ts in shared	217	2	6	3	5
lazyWithRetry.ts in client/utilities	42	1	6	14	6
SettingsFormSection.tsx in client/components/mma/identity/settings	333	1	6	2	6
FieldWrapper.tsx in client/components/mma/paymentUpdate	137	2	6	4	5
cancellationContributionReminder.tsx in client/components/mma/cancel	153	5	5	3	1
EmailAndMarketing.tsx in client/components/mma/identity/emailAndMarketing	228	3	5	2	2
manage-frontend.ts in cdk/lib	194	1	4	2	4
currencyIso.ts in client/utilities	30	3	4	13	2
stripe.ts in client/utilities	58	1	4	7	4
useAsyncLoader.ts in client/utilities/hooks	45	2	4	9	2
LiveChatPrivacyNotice.tsx in client/components/helpCentre/liveChat	74	1	4	5	4
ErrorBoundary.tsx in client/components/shared	32	2	4	13	3
DigiSubSaves.stories.tsx in client/components/mma/cancel/cancellationSaves/digipack	116	4	4	3	1
CancellationReasonSelection.tsx in client/components/mma/cancel	374	1	4	1	4
CancellationReasonReview.tsx in client/components/mma/cancel	852	2	4	0	3
CancellationContainer.tsx in client/components/mma/cancel	175	1	4	2	4
UpgradeSupportContainer.tsx in client/components/mma/upgrade	129	1	4	3	4
ProfileFormSection.tsx in client/components/mma/identity/publicProfile	91	1	4	4	4
PaymentDetailsTableV2.tsx in client/components/mma/shared	197	1	4	2	4
PaymentDetailUpdateConfirmation.tsx in client/components/mma/paymentUpdate	429	1	4	1	4
apiGatewayDiscovery.ts in server	305	3	3	1	1

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.