• There are 715 files with units, with 67,952 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)
• 0 medium complex files (McCabe index sum 51-125; 0 lines of code)
• 14 slightly complex files (McCabe index sum 26-50; 3,409 lines of code)
• 701 simple files (McCabe index sum 1-25; 64,543 lines of code)
• 607 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
RestRequestMaker.scala in lib/restHttp/src/main/scala/com/gu/util/resthttp	199	19	50	25	6
Handler.scala in handlers/holiday-stop-api/src/main/scala/com/gu/holiday_stops	552	14	49	9	22
acquisitions.ts in handlers/mparticle-acquisitions-publisher/src	312	15	47	15	8
RatePlanChargeBillingSchedule.scala in lib/zuora-core/src/main/scala/com/gu/zuora/subscription	289	11	44	15	8
AutoCancel.scala in handlers/zuora-callout-apis/src/main/scala/com/gu/autoCancel	188	8	34	18	7
downloadRealSubscriptions.ts in modules/guardian-subscription/runManual/realSubscriptions	190	9	33	17	12
paymentDescription.ts in modules/email/src/dataFields/dayZero	191	13	31	16	6
ZuoraRerService.scala in handlers/zuora-rer/src/main/scala/com/gu/zuora/rer	223	13	31	14	4
SQS.scala in handlers/product-move-api/src/main/scala/com/gu/productmove	278	12	31	11	10
Handler.scala in handlers/sf-emails-to-s3-exporter/src/main/scala/com/gu/sf_emails_to_s3_exporter	177	9	31	18	7
Types.scala in lib/handler/src/main/scala/com/gu/util/reader	143	13	30	21	3
SubscriptionData.scala in lib/zuora-core/src/main/scala/com/gu/zuora/subscription	169	10	29	17	9
createSubscription.ts in modules/zuora/src/createSubscription	287	8	29	10	18
ZuoraOrders.scala in lib/zuora-core/src/main/scala/com/gu/zuora	211	5	26	12	14
WireModel.scala in handlers/new-product-api/src/main/scala/com/gu/newproduct/api/productcatalog	203	7	25	12	8
Salesforce.scala in handlers/single-contribution-salesforce-writes/src/main/scala/com/gu/singleContributionSalesforceWrites/services	178	9	25	14	5
RecurringContributionToSupporterPlus.scala in handlers/product-move-api/src/main/scala/com/gu/productmove/endpoint/move/switchtype	374	8	23	6	5
S3Connector.scala in handlers/sf-emails-to-s3-exporter/src/main/scala/com/gu/sf_emails_to_s3_exporter	158	10	23	15	6
Handler.scala in handlers/sf-gocardless-sync/src/main/scala/com/gu/sf_gocardless_sync	188	7	22	12	6
Handler.scala in handlers/dev-env-cleaner/src/main/scala/com/gu/cleaner	231	9	22	10	8
brazeClient.ts in handlers/mparticle-api/src/services	123	4	22	18	12
ToRecurringContribution.scala in handlers/product-move-api/src/main/scala/com/gu/productmove/endpoint/move/switchtype	231	6	21	9	8
Lambda.scala in handlers/stripe-webhook-endpoints/src/main/scala/com/gu/paymentIntentIssues	140	7	21	15	6
IAPMessageProcessor.scala in handlers/soft-opt-in-consent-setter/src/main/scala/com/gu/soft_opt_in_consent_setter	190	6	21	11	8
Processor.scala in lib/credit-processor/src/main/scala/com/gu/creditprocessor	281	7	20	7	9
GetSFContactSyncCheckFields.scala in handlers/identity-backfill/src/main/scala/com/gu/identityBackfill/salesforce	101	4	20	20	14
ProductMoveEndpointSteps.scala in handlers/product-move-api/src/main/scala/com/gu/productmove/endpoint/move	83	4	20	24	7
SalesforceHolidayStopRequest.scala in lib/holiday-stops/src/main/scala/com/gu/salesforce/holiday_stops	356	10	19	5	8
restClient.ts in modules/zuora/src	222	10	19	9	7
subscriptionFilter.ts in modules/guardian-subscription/src	154	8	19	12	5
UpdateSupporterPlusAmountSteps.scala in handlers/product-move-api/src/main/scala/com/gu/productmove/endpoint/updateamount	164	3	19	12	12
Main.scala in handlers/sf-api-user-credentials-setter/src/main/scala/com/gu/sfapiusercredentialsetter	224	14	19	8	3
SalesforceToBrazeCampaignMapping.scala in handlers/batch-email-sender/src/main/scala/com/gu/batchemailsender/api/batchemail	28	1	19	68	19
getProductRatePlan.ts in modules/zuora/src/createSubscription	98	1	18	18	18
SendConfirmationEmail.scala in handlers/new-product-api/src/main/scala/com/gu/newproduct/api/addsubscription/email	57	3	18	32	13
DeliveryCreditProcessor.scala in handlers/delivery-problem-credit-processor/src/main/scala/com/gu/deliveryproblemcreditprocessor	222	7	18	8	4
secondaryUserRepository.ts in modules/multiple-account/src	238	14	17	7	3
PreReqCheck.scala in handlers/identity-backfill/src/main/scala/com/gu/identityBackfill	110	5	17	15	5
AvailableProductMovesEndpoint.scala in handlers/product-move-api/src/main/scala/com/gu/productmove/endpoint/available	190	5	17	9	5
DomainSteps.scala in handlers/sf-contact-merge/src/main/scala/com/gu/sf_contact_merge	148	6	17	11	4
CardUpdatedSteps.scala in handlers/stripe-webhook-endpoints/src/main/scala/com/gu/stripeCardUpdated	143	6	17	12	6
SalesforceConnector.scala in handlers/soft-opt-in-consent-setter/src/main/scala/com/gu/soft_opt_in_consent_setter	140	12	17	12	3
S3Helper.scala in handlers/zuora-sar/src/main/scala/com/gu/zuora/sar	168	7	17	10	4
SalesforceToBrazeTransformations.scala in handlers/batch-email-sender/src/main/scala/com/gu/batchemailsender/api/batchemail	39	5	17	44	4
RatePlanChargeData.scala in lib/zuora-core/src/main/scala/com/gu/zuora/subscription	87	4	16	18	8
subscription.ts in modules/zuora/src	109	8	16	15	2
SubscriptionCancelEndpointSteps.scala in handlers/product-move-api/src/main/scala/com/gu/productmove/endpoint/cancel	163	4	16	10	9
multipleAccountEmails.ts in handlers/multiple-account-api/src	217	13	16	7	3
DigitalVoucherService.scala in handlers/digital-voucher-api/src/main/scala/com/gu/digital_voucher_api	166	8	16	10	5
Types.scala in lib/restHttp/src/main/scala/com/gu/util/resthttp	75	6	15	20	6

• 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.