• There are 23 files with units, with 1,454 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; 353 lines of code)
• 0 slightly complex files (McCabe index sum 26-50; 0 lines of code)
• 22 simple files (McCabe index sum 1-25; 1,101 lines of code)
• 54 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
ElasticsearchRepo.scala in src/main/scala/datastore	353	15	59	17	9
Edge.scala in src/main/scala/com/gu/contentapi/porter/graphql	72	5	23	32	8
AlternateIdParameters.scala in src/main/scala/com/gu/contentapi/porter/graphql	109	4	20	18	12
UserTier.scala in src/main/scala/security	30	6	18	60	6
AlternateIdParameters.scala in src/main/scala/deprecated/anotherschema/query	98	2	17	17	11
FieldPermissions.scala in src/main/scala/middleware	48	4	12	25	5
ApiKeyAuth.scala in src/main/scala/security	88	6	12	14	4
GraphQLServer.scala in src/main/scala	63	3	8	13	4
concierge-graphql.ts in cdk/lib	130	4	7	5	4
hostname.ts in cdk/lib	20	1	6	30	6
Security.scala in src/main/scala/security	32	2	5	16	4
Config.scala in src/main/scala/utils	20	1	5	25	5
FieldMetrics.scala in src/main/scala/middleware	36	4	4	11	1
GraphQLRequestBody.scala in src/main/scala/utils	17	1	3	18	3
CirceHelpers.scala in src/main/scala/deprecated/anotherschema	22	1	3	14	3
ElementArguments.scala in src/main/scala/deprecated/anotherschema/content/blocks/element	18	1	3	17	3
gateway.ts in cdk/lib	62	1	2	3	2
ElasticSearchResolver.scala in src/main/scala	33	2	2	6	1
DateTime.scala in src/main/scala/com/gu/contentapi/porter/graphql	13	2	2	15	1
graphiql-explorer.ts in cdk/lib	72	1	1	1	1
KongHeader.scala in src/main/scala/security	12	1	1	8	1
RawResult.scala in src/main/scala/utils	32	1	1	3	1
Main.scala in src/main/scala	74	1	1	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.