• There are 29 files with units, with 3,265 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)
• 1 medium complex files (McCabe index sum 51-125; 489 lines of code)
• 4 slightly complex files (McCabe index sum 26-50; 597 lines of code)
• 24 simple files (McCabe index sum 1-25; 2,179 lines of code)
• 12 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
IamOutdatedCredentials.scala in iam-outdated-credentials/src/main/scala/logic	489	20	56	11	9
CredentialsReportDisplay.scala in core/src/main/scala/logic	125	13	45	36	5
IAMClient.scala in core/src/main/scala/aws/iam	194	12	31	16	7
Attempt.scala in core/src/main/scala/utils/attempt	131	20	27	21	3
IamRemediationDb.scala in core/src/main/scala/db	147	9	26	18	5
UnrecognisedUsers.scala in iam-unrecognised-users/src/main/scala/unrecognised	207	8	21	10	4
IamUnrecognisedUsers.scala in core/src/main/scala/logic	101	7	20	20	5
CredentialsReport.scala in core/src/main/scala/aws/iam	113	8	20	18	5
AnghammaradNotifications.scala in core/src/main/scala/notifications	245	10	20	8	4
Cloudwatch.scala in core/src/main/scala/logging	169	10	14	8	3
models.scala in core/src/main/scala/model	129	4	12	9	8
security-hq.ts in cdk/lib	471	11	11	2	1
AwsAsyncHandler.scala in core/src/main/scala/aws	47	2	11	23	9
GuardianDuty.scala in guardian-duty/src/main/scala/com/gu/guardianduty	74	3	11	15	4
Failure.scala in core/src/main/scala/utils/attempt	78	10	10	13	1
S3.scala in core/src/main/scala/aws/s3	58	2	10	17	7
Services.scala in guardian-duty/src/main/scala/com/gu/guardianduty	51	6	8	16	3
package.scala in core/src/main/scala/aws	52	2	7	13	4
Settings.scala in iam-outdated-credentials/src/main/scala/settings	53	2	6	11	4
CoreConfig.scala in core/src/main/scala/config	62	3	5	8	3
Retry.scala in core/src/main/scala/logic	25	1	5	20	5
IamOutdatedCredentialsMain.scala in iam-outdated-credentials/src/main/scala/logic	28	1	5	18	5
VulnerableAccessKeys.scala in core/src/main/scala/logic	19	1	3	16	3
AWS.scala in core/src/main/scala/aws	66	2	3	5	2
IamOutdatedCredentialsLambda.scala in iam-outdated-credentials/src/main/scala/logic	21	1	3	14	3
Cli.scala in guardian-duty/src/main/scala/com/gu/guardianduty	21	1	3	14	3
Handler.scala in iam-unrecognised-users/src/main/scala/unrecognised	16	1	1	6	1
Settings.scala in iam-unrecognised-users/src/main/scala/unrecognised	33	1	1	3	1
Lambda.scala in guardian-duty/src/main/scala/com/gu/guardianduty	40	1	1	3	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.