• File size measurements show the distribution of size of files.
• Files are classified in four categories based on their size (lines of code): 1-100 (very small files), 101-200 (small files), 201-500 (medium size files), 501-1000 (long files), 1001+(very long files).
• It is a good practice to keep files small. Long files may become "bloaters", code that have increased to such gargantuan proportions that they are hard to work with.

• There are 51,394 files with 2,116,270 lines of code.
• 154 very long files (311,697 lines of code)
• 309 long files (210,508 lines of code)
• 1,261 medium size files (379,760 lines of codeclsfd_ftr_w_mp_ins)
• 2,162 small files (299,785 lines of code)
• 47,508 very small files (914,520 lines of code)

There are 8879 files with lines longer than 120 characters. In total, there are 55613 long lines.

File	# lines	# units	# long lines
1.kt in compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos	3472	31	1217
verification-metadata.xml in gradle	5885	-	1005
FirErrors.kt in compiler/fir/checkers/gen/org/jetbrains/kotlin/fir/analysis/diagnostics	1005	-	859
SourceResolveCandidatesFirTreeConsistencyTestGenerated.java in analysis/low-level-api-fir/tests-gen/org/jetbrains/kotlin/analysis/low/level/api/fir/resolve	5767	1091	671
12.kt in compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos	3442	307	648
13.kt in compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos	3659	266	511
DefaultErrorMessages.java in compiler/frontend/src/org/jetbrains/kotlin/diagnostics/rendering	1137	5	428
1.fir.kt in compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos	3472	31	365
Errors.java in compiler/frontend/src/org/jetbrains/kotlin/diagnostics	1152	5	283
LoadJavaTestGenerated.java in compiler/tests-gen/org/jetbrains/kotlin/jvm/compiler	4305	998	279
LoadJavaUsingJavacTestGenerated.java in compiler/tests-gen/org/jetbrains/kotlin/jvm/compiler/javac	4305	998	279
FirErrorsDefaultMessages.kt in compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics	3656	2	253
annotations.xml in annotations/org/jetbrains/org/objectweb/asm/util	1496	-	250
ProtoCompareGenerated.kt in build-common/src/org/jetbrains/kotlin/incremental	2291	88	239
6.kt in compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos	1124	66	238
annotations.xml in annotations/org/jetbrains/org/objectweb/asm/commons	1037	-	218
m.kt in compiler/testData/klib/partial-linkage/inlineFunctions-withInliningInKlibs/main	293	-	213
m.kt in compiler/testData/klib/partial-linkage/inlineFunctions-noInliningInKlibs/main	266	-	206
KaFirDiagnosticsImpl.kt in analysis/analysis-api-fir/gen/org/jetbrains/kotlin/analysis/api/fir/diagnostics	5343	-	205
KotlinToolingDiagnostics.kt in libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics	1986	2	179
l2.kt in compiler/testData/klib/partial-linkage/inlineFunctions-noInliningInKlibs/lib2	385	-	178
l2.kt in compiler/testData/klib/partial-linkage/inlineFunctions-withInliningInKlibs/lib2	407	-	178
LoadKotlinWithTypeTableTestGenerated.java in compiler/tests-gen/org/jetbrains/kotlin/jvm/compiler	2355	554	145
16.kt in compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos	626	45	142
annotations.xml in annotations/org/jetbrains/org/objectweb/asm/tree/analysis	599	-	138
clang.kt in kotlin-native/libclangInterop/gen/main-mingw_x64/kotlin/clang	5073	360	138
clang.kt in kotlin-native/libclangInterop/gen/main-linux_x64/kotlin/clang	5073	360	138
main.kt in kotlin-native/performance/ring/src/main/kotlin	253	1	137
clang.kt in kotlin-native/libclangInterop/gen/main-macos_arm64/kotlin/clang	5040	357	136
clang.kt in kotlin-native/libclangInterop/gen/main-macos_x64/kotlin/clang	5040	357	136
IdeSourceSetConstraintTest.kt in libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/dependencyResolutionTests/tcs	396	-	134
jsExceptionNoJsTag.kt in compiler/testData/codegen/boxWasmJsInterop	1588	108	132
jsExceptionNewProposalNoJsTag.kt in compiler/testData/codegen/boxWasmJsInterop	1588	108	132
IncrementalK2FirICJvmCompilerRunnerTestGenerated.java in compiler/incremental-compilation-impl/tests-gen/org/jetbrains/kotlin/incremental	2257	482	131
SourceResolveCandidatesByFileFirTreeConsistencyTestGenerated.java in analysis/low-level-api-fir/tests-gen/org/jetbrains/kotlin/analysis/low/level/api/fir/resolve	935	175	128
IncrementalK2PsiJvmCompilerRunnerTestGenerated.java in compiler/incremental-compilation-impl/tests-gen/org/jetbrains/kotlin/incremental	2261	483	127
7.kt in compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos	465	23	126
annotations.xml in annotations/org/jetbrains/org/objectweb/asm/tree	593	-	125
IncrementalK1JvmCompilerRunnerTestGenerated.java in compiler/incremental-compilation-impl/tests-gen/org/jetbrains/kotlin/incremental	2237	477	125
IncrementalK2JvmCompilerRunnerTestGenerated.java in compiler/incremental-compilation-impl/tests-gen/org/jetbrains/kotlin/incremental	2261	483	125
m.kt in compiler/testData/klib/partial-linkage/classTransformations/main	155	-	123
org.w3c.dom.kt in libraries/stdlib/js/src/org.w3c	5619	448	122
l2.kt in compiler/testData/klib/partial-linkage/classTransformations/lib2	230	3	120
jsExceptionInSuspendFunctionNoJsTag.kt in compiler/testData/codegen/boxWasmJsInterop	1437	96	120
FirDiagnosticsList.kt in compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics	2096	-	119
m.kt in compiler/testData/klib/partial-linkage/inheritanceIssues/main	136	-	119
jsExceptionNewProposal.kt in compiler/testData/codegen/boxWasmJsInterop	1734	108	118
jsException.kt in compiler/testData/codegen/boxWasmJsInterop	1734	108	118
PsiRawFirBuilder.kt in compiler/fir/raw-fir/psi2fir/src/org/jetbrains/kotlin/fir/builder	3350	56	116
BasicExpressionTypingVisitor.java in compiler/frontend/src/org/jetbrains/kotlin/types/expressions	1520	72	113