• There are 604 files with units, with 55,430 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)
• 6 medium complex files (McCabe index sum 51-125; 3,384 lines of code)
• 22 slightly complex files (McCabe index sum 26-50; 5,718 lines of code)
• 576 simple files (McCabe index sum 1-25; 46,328 lines of code)
• 516 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
oneTimeCheckoutComponent.tsx in support-frontend/assets/pages/[countryGroupId]/components	1196	14	113	9	70
CheckoutValidationRules.scala in support-frontend/app/utils	590	18	86	15	15
acquisitionDataRowBuilder.ts in support-workers/src/typescript/acquisitionData	315	17	75	24	17
CreateSubscriptionController.scala in support-frontend/app/controllers	510	16	62	12	8
Application.scala in support-frontend/app/controllers	632	28	60	9	9
billingPeriods.ts in support-frontend/assets/helpers/productPrice	141	7	53	38	24
CheckoutFailureReasons.scala in support-models/src/main/scala/com/gu/support/workers	101	2	45	45	44
thankYouComponent.tsx in support-frontend/assets/pages/[countryGroupId]/components	326	2	45	14	28
StripeBackend.scala in support-payment-api/src/main/scala/backend	346	11	41	12	19
quantumMetric.ts in support-frontend/assets/helpers/tracking	325	21	40	12	4
sendThankYouEmailLambda.ts in support-workers/src/typescript/lambdas	274	31	39	14	4
googleTagManager.ts in support-frontend/assets/helpers/tracking	182	16	39	21	5
PaymentFields.scala in support-models/src/main/scala/com/gu/support/workers	110	6	38	35	11
countryGroup.ts in support-frontend/assets/helpers/internationalisation/classes	113	8	35	31	15
abtest.ts in support-frontend/assets/helpers/abTests	292	11	35	12	8
testimonialsContainer.tsx in support-frontend/assets/pages/aus-moment-map/components	326	8	34	10	20
acquisitions.ts in support-frontend/assets/helpers/tracking	271	13	34	13	7
frontend.ts in cdk/lib	539	31	33	6	3
onboardingInviteeComponent.tsx in support-frontend/assets/pages/[countryGroupId]/components	240	1	33	14	33
checkoutNudge.tsx in support-frontend/assets/components/checkoutNudge	404	5	32	8	12
stateSchemas.ts in support-workers/src/typescript/model	164	31	31	19	1
threeTierLanding.tsx in support-frontend/assets/pages/supporter-plus-landing/twoStepPages	504	12	31	6	11
country.ts in support-frontend/assets/helpers/internationalisation/classes	160	11	30	19	6
address.ts in support-workers/src/typescript/model	101	11	27	27	13
HttpIdentityService.scala in support-frontend/app/services	303	13	27	9	6
router.tsx in support-frontend/assets/pages/[countryGroupId]	296	23	27	9	3
utilities.ts in support-frontend/assets/helpers/utilities	134	10	27	20	6
PatronCancelledEventLambda.scala in stripe-patrons-data/src/main/scala/com/gu/patrons/lambdas	207	10	27	13	6
InvitationController.scala in support-frontend/app/controllers	123	6	25	20	7
onboardingComponent.tsx in support-frontend/assets/pages/[countryGroupId]/components	273	1	25	9	25
getWeeklyProducts.tsx in support-frontend/assets/pages/weekly-subscription-landing/helpers	200	7	25	13	6
WebServiceHelper.scala in support-modules/rest/src/main/scala/com/gu/rest	158	9	24	15	4
thankYouModule.stories.tsx in support-frontend/stories/checkouts	393	24	24	6	1
contributionsOrderSummary.tsx in support-frontend/assets/components/orderSummary	312	1	24	8	24
paymentTsAndCs.tsx in support-frontend/assets/pages/supporter-plus-landing/components	351	10	23	7	8
PaypalBackend.scala in support-payment-api/src/main/scala/backend	263	9	21	8	4
thankYouModuleData.tsx in support-frontend/assets/components/thankYou	403	18	21	5	2
links.tsx in support-frontend/assets/components/headers/links	171	4	21	12	16
checkoutForm.tsx in support-frontend/assets/pages/[countryGroupId]/components	1192	7	21	2	5
errorReasons.ts in support-frontend/assets/helpers/forms	71	2	21	30	20
Product.scala in support-models/src/main/scala/com/gu/support/catalog	487	8	20	4	7
CountryGroup.scala in support-internationalisation/src/main/scala/com/gu/i18n	367	4	20	5	17
UserFromAuthCookiesActionBuilder.scala in support-frontend/app/actions	185	7	20	11	6
AuthCodeFlowController.scala in support-frontend/app/controllers	150	7	20	13	8
invitation.ts in support-frontend/assets/helpers/onboardingInvitee	127	4	20	16	8
checkoutNudgeAbTests.ts in support-frontend/assets/helpers/abTests	158	2	20	13	14
subscriptionCopy.tsx in support-frontend/assets/pages/subscriptions-landing/copy	208	15	19	9	3
deliveryAgentsSelect.tsx in support-frontend/assets/pages/paper-subscription-checkout/components	206	8	19	9	7
JsonHelpers.scala in support-models/src/main/scala/com/gu/support/encoding	97	8	18	19	8
PaperRound.scala in support-frontend/app/controllers	104	4	18	17	10

• 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.