microsoft / TypeScript

Conditional Complexity

The distribution of complexity of units (measured with McCabe index).

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 13,747 units with 175,311 lines of code in units (72.9% of code).

50 very complex units (10,505 lines of code)
175 complex units (12,912 lines of code)
897 medium complex units (33,754 lines of code)
1,683 simple units (34,169 lines of code)
10,942 very simple units (83,971 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
export function forEachChild() in src/compiler/parser.ts	499	382	2
function pipelineEmitWithHintWorker() in src/compiler/emitter.ts	422	221	3
const invalidOperationsInPartialSemanticMode: readonly() in src/services/services.ts	1120	208	1
const invalidOperationsInSyntacticMode: readonly() in src/services/services.ts	1101	208	1
function structuredTypeRelatedToWorker() in src/compiler/checker.ts	386	187	4
export function getSymbolDisplayPartsDocumentationAndSymbolKind() in src/services/symbolDisplay.ts	410	154	6
export function visitEachChild() in src/compiler/visitorPublic.ts	777	143	6
function verifyCompilerOptions() in src/compiler/program.ts	222	120	0
loop: while() in src/compiler/checker.ts	204	117	1
function bindWorker() in src/compiler/binder.ts	222	112	1
function checkGrammarModifiers() in src/compiler/checker.ts	240	103	1
function getAdjustedLocation() in src/services/utilities.ts	109	101	2
function checkSourceElementWorker() in src/compiler/checker.ts	180	99	1
function isSolelyIdentifierDefinitionLocation() in src/services/completions.ts	120	89	1
export function nodeWillIndentChild() in src/services/formatting/smartIndenter.ts	99	82	5
function checkIdentifier() in src/compiler/checker.ts	135	81	2
function addChildrenRecursively() in src/services/navigationBar.ts	224	81	1
function resolveNameHelper() in src/compiler/checker.ts	137	80	9
function inferFromTypes() in src/compiler/checker.ts	161	79	2
function getCompletionData() in src/services/completions.ts	211	79	2
errorSymbolName: symbolToString() in src/compiler/checker.ts	196	77	3
errorModuleName: symbolToString() in src/compiler/checker.ts	195	77	1
function propertiesRelatedTo() in src/compiler/checker.ts	138	75	5
function visitTypeScript() in src/compiler/transformers/ts.ts	110	74	1
function checkPropertyAccessExpressionOrQualifiedName() in src/compiler/checker.ts	121	72	5
function compareSignaturesRelated() in src/compiler/checker.ts	112	71	7
function serializeSymbolWorker() in src/compiler/checker.ts	137	70	3
function getPropertyTypeForIndexType() in src/compiler/checker.ts	156	70	6
function isCompletedNode() in src/services/utilities.ts	109	69	2
function getSymbolAtLocation() in src/compiler/checker.ts	106	64	2
function resolveExternalModule() in src/compiler/checker.ts	114	63	5
function getTypeOfVariableOrParameterOrPropertyWorker() in src/compiler/checker.ts	109	63	1
export function isExpressionNode() in src/compiler/utilities.ts	64	62	1
export function getOperatorPrecedence() in src/compiler/utilities.ts	83	62	3
function createNodeBuilder() in src/compiler/checker.ts	172	61	0
function createUnionOrIntersectionProperty() in src/compiler/checker.ts	137	60	3
function checkVariableLikeDeclaration() in src/compiler/checker.ts	116	60	1
function createCompletionEntry() in src/services/completions.ts	127	59	22
function emitNodeList() in src/compiler/emitter.ts	132	58	2
export function getNodeKind() in src/services/utilities.ts	86	58	1
function getTypeForVariableLikeDeclaration() in src/compiler/checker.ts	92	56	2
function getTypeFromTypeNodeWorker() in src/compiler/checker.ts	96	56	1
function checkBinaryLikeExpressionWorker() in src/compiler/checker.ts	63	56	6
function isSimpleTypeRelatedTo() in src/compiler/checker.ts	33	54	4
function determineIfDeclarationIsVisible() in src/compiler/checker.ts	69	53	0
export function createProgram() in src/compiler/program.ts	276	53	5
export function isPartOfTypeNode() in src/compiler/utilities.ts	81	53	1
function visitorWorker() in src/compiler/transformers/es2015.ts	102	52	2
function inferTypeFromBinaryExpression() in src/services/codefixes/inferFromUsage.ts	79	52	3
function getSymbolOfNameOrPropertyAccessExpression() in src/compiler/checker.ts	115	51	1