• There are 76 files with units, with 9,161 lines of code.
• 1 very complex files (McCabe index sum 251+; 1,036 lines of code)
• 1 complex files (McCabe index sum 126-250; 577 lines of code)
• 12 medium complex files (McCabe index sum 51-125; 2,796 lines of code)
• 17 slightly complex files (McCabe index sum 26-50; 2,152 lines of code)
• 45 simple files (McCabe index sum 1-25; 2,600 lines of code)
• 38 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
Map.js in src/js/modules/leaflet/src/map	1036	104	342	33	19
GridLayer.js in src/js/modules/leaflet/src/layer/tile	577	50	177	31	19
Canvas.js in src/js/modules/leaflet/src/layer/vector	328	30	100	30	9
DomEvent.js in src/js/modules/leaflet/src/dom	189	18	96	51	21
Leaflet.GoogleMutant.js in src/js/modules	316	24	83	26	11
Popup.js in src/js/modules/leaflet/src/layer	298	25	83	28	12
Tooltip.js in src/js/modules/leaflet/src/layer	245	26	81	33	10
GeoJSON.js in src/js/modules/leaflet/src/layer	237	19	81	34	22
DomUtil.js in src/js/modules/leaflet/src/dom	208	28	76	37	8
Control.Layers.js in src/js/modules/leaflet/src/control	264	23	75	28	11
Marker.js in src/js/modules/leaflet/src/layer/marker	216	24	56	26	15
Polyline.js in src/js/modules/leaflet/src/layer/vector	198	19	56	28	10
Events.js in src/js/modules/leaflet/src/core	159	10	53	33	11
Layer.js in src/js/modules/leaflet/src/layer	138	16	52	38	13
LatLngBounds.js in src/js/modules/leaflet/src/geo	129	19	47	36	9
Util.js in src/js/modules/leaflet/src/core	136	19	46	34	5
ImageOverlay.js in src/js/modules/leaflet/src/layer	158	20	44	28	9
Draggable.js in src/js/modules/leaflet/src/dom	125	8	42	34	14
TileLayer.js in src/js/modules/leaflet/src/layer/tile	168	12	41	24	7
LineUtil.js in src/js/modules/leaflet/src/geometry	149	11	40	27	7
relocator.js in src/js/modules	196	7	37	19	12
Point.js in src/js/modules/leaflet/src/geometry	119	25	36	30	8
Map.Keyboard.js in src/js/modules/leaflet/src/map/handler	127	11	34	27	14
Map.Drag.js in src/js/modules/leaflet/src/map/handler	154	12	34	22	7
SVG.js in src/js/modules/leaflet/src/layer/vector	132	16	34	26	8
Bounds.js in src/js/modules/leaflet/src/geometry	90	13	33	37	7
Polygon.js in src/js/modules/leaflet/src/layer/vector	96	8	31	32	9
DivOverlay.js in src/js/modules/leaflet/src/layer	122	14	29	24	6
Class.js in src/js/modules/leaflet/src/core	72	9	28	39	8
Map.TouchZoom.js in src/js/modules/leaflet/src/map/handler	88	5	27	31	15
DomEvent.Pointer.js in src/js/modules/leaflet/src/dom	91	11	27	30	6
LayerGroup.js in src/js/modules/leaflet/src/layer	76	14	25	33	4
SVG.VML.js in src/js/modules/leaflet/src/layer/vector	103	10	24	23	10
Icon.js in src/js/modules/leaflet/src/layer/marker	61	8	23	38	9
Control.js in src/js/modules/leaflet/src/control	94	13	23	24	5
Control.Scale.js in src/js/modules/leaflet/src/control	78	9	23	29	5
Map.BoxZoom.js in src/js/modules/leaflet/src/map/handler	103	12	22	21	4
DomEvent.DoubleTap.js in src/js/modules/leaflet/src/dom	60	4	20	33	9
Map.Tap.js in src/js/modules/leaflet/src/map/handler	87	7	19	22	8
Renderer.js in src/js/modules/leaflet/src/layer/vector	88	11	19	22	3
Control.Zoom.js in src/js/modules/leaflet/src/control	87	9	19	22	5
CircleMarker.js in src/js/modules/leaflet/src/layer/vector	64	13	18	28	3
Control.Attribution.js in src/js/modules/leaflet/src/control	77	7	18	23	6
scrollyteller.js in src/js	70	5	16	23	9
TileLayer.WMS.js in src/js/modules/leaflet/src/layer/tile	66	5	15	23	5
Marker.Drag.js in src/js/modules/leaflet/src/layer/marker	100	9	15	15	2
CRS.js in src/js/modules/leaflet/src/geo/crs	57	9	14	25	3
Circle.js in src/js/modules/leaflet/src/layer/vector	65	5	13	20	6
Renderer.getRenderer.js in src/js/modules/leaflet/src/layer/vector	29	3	13	45	6
Path.js in src/js/modules/leaflet/src/layer/vector	64	9	13	20	2

• 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.