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Intro

For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.

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Duplication Overall

9% duplication:

37,404 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
3,369 duplicated lines

326 duplicates

Duplication per Extension

Duplication per Component (primary)

Duplication Between Components (50+ lines)

Download: SVG DOT (open online Graphviz editor)

From Component --> To Component	Duplicated Lines	File Pairs	Details
packages/jest-circus (8%) --> packages/jest-jasmine2 (4%)	231	2 file pairs	details...

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Longest Duplicates

The list of 50 longest duplicates.

See data for all 326 duplicates...

Size	#	Folders	Files	Lines	Code
35	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	processChild.ts threadChild.ts	114:165 (36%) 116:167 (35%)	view
28	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	ChildProcessWorker.ts NodeThreadsWorker.ts	165:203 (17%) 132:171 (19%)	view
23	x 2	packages/jest-circus/src packages/jest-jasmine2/src	formatNodeAssertErrors.ts assertionErrorMessage.ts	104:130 (15%) 67:93 (20%)	view
22	x 2	packages/expect/src packages/expect/src	matchers.ts matchers.ts	610:632 (2%) 935:957 (2%)	view
20	x 2	packages/jest-resolve/src packages/jest-resolve/src	resolver.ts resolver.ts	707:731 (3%) 766:790 (3%)	view
18	x 2	packages/jest-runtime/src packages/jest-runtime/src	index.ts index.ts	1783:1809 (1%) 1854:1880 (1%)	view
18	x 2	packages/jest-core/src packages/jest-core/src	watch.ts watch.ts	112:129 (4%) 133:150 (4%)	view
17	x 2	packages/jest-runtime/src packages/jest-runtime/src	index.ts index.ts	1827:1844 (<1%) 1901:1918 (<1%)	view
16	x 2	packages/expect/src packages/expect/src	spyMatchers.ts spyMatchers.ts	554:571 (1%) 704:721 (1%)	view
16	x 2	packages/jest-diff/src packages/jest-matcher-utils/src	index.ts index.ts	33:49 (11%) 29:45 (3%)	view
16	x 2	packages/jest-transform/src packages/jest-transform/src	ScriptTransformer.ts ScriptTransformer.ts	489:506 (2%) 553:570 (2%)	view
16	x 2	packages/jest-circus/src packages/jest-jasmine2/src	formatNodeAssertErrors.ts assertionErrorMessage.ts	23:39 (10%) 17:33 (14%)	view
16	x 2	packages/expect/src packages/expect/src	matchers.ts matchers.ts	522:539 (2%) 575:592 (2%)	view
15	x 2	packages/jest-runtime/src packages/jest-runtime/src	index.ts index.ts	487:502 (<1%) 612:627 (<1%)	view
15	x 2	packages/jest-circus/src/legacy-code-todo-rewrite packages/jest-jasmine2/src	jestAdapter.ts index.ts	107:128 (18%) 184:206 (11%)	view
15	x 2	packages/jest-changed-files/src packages/jest-changed-files/src	git.ts git.ts	58:72 (18%) 76:90 (18%)	view
14	x 2	packages/jest-circus/src packages/jest-jasmine2/src	formatNodeAssertErrors.ts assertionErrorMessage.ts	86:102 (9%) 49:65 (12%)	view
14	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	processChild.ts threadChild.ts	9:23 (14%) 10:24 (14%)	view
14	x 2	packages/jest-circus/src packages/jest-jasmine2/src	formatNodeAssertErrors.ts assertionErrorMessage.ts	152:167 (9%) 113:128 (12%)	view
14	x 2	packages/diff-sequences/src packages/diff-sequences/src	index.ts index.ts	576:589 (2%) 622:635 (2%)	view
13	x 2	packages/expect/src packages/expect/src	spyMatchers.ts spyMatchers.ts	658:671 (1%) 817:830 (1%)	view
13	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	processChild.ts threadChild.ts	44:60 (13%) 46:62 (13%)	view
13	x 2	packages/expect/src packages/expect/src	spyMatchers.ts spyMatchers.ts	629:642 (1%) 789:803 (1%)	view
13	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	ChildProcessWorker.ts NodeThreadsWorker.ts	13:25 (8%) 12:24 (8%)	view
13	x 2	packages/jest-transform/src packages/jest-transform/src	ScriptTransformer.ts ScriptTransformer.ts	597:612 (1%) 640:655 (1%)	view
13	x 2	packages/jest-transform/src packages/jest-transform/src	ScriptTransformer.ts ScriptTransformer.ts	579:595 (1%) 622:638 (1%)	view
13	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	processChild.ts threadChild.ts	89:109 (13%) 91:111 (13%)	view
13	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	ChildProcessWorker.ts NodeThreadsWorker.ts	141:161 (8%) 109:129 (8%)	view
12	x 2	packages/pretty-format/src packages/pretty-format/src	collections.ts collections.ts	44:59 (9%) 106:121 (9%)	view
12	x 2	packages/jest-resolve/src packages/jest-resolve/src	utils.ts utils.ts	158:170 (8%) 179:191 (8%)	view
12	x 2	packages/jest-transform/src packages/jest-transform/src	ScriptTransformer.ts ScriptTransformer.ts	463:484 (1%) 522:543 (1%)	view
12	x 2	packages/jest-resolve/src packages/jest-resolve/src	utils.ts utils.ts	129:141 (8%) 158:170 (8%)	view
12	x 2	packages/jest-resolve/src packages/jest-resolve/src	utils.ts utils.ts	129:141 (8%) 179:191 (8%)	view
12	x 2	packages/jest-resolve/src packages/jest-resolve/src	resolver.ts resolver.ts	741:759 (1%) 800:818 (1%)	view
12	x 2	packages/jest-core/src packages/jest-core/src	FailedTestsInteractiveMode.ts SnapshotInteractiveMode.ts	53:64 (10%) 177:188 (7%)	view
11	x 2	packages/expect/src packages/expect/src	spyMatchers.ts spyMatchers.ts	357:367 (1%) 406:416 (1%)	view
11	x 2	packages/jest-transform/src packages/jest-transform/src	ScriptTransformer.ts ScriptTransformer.ts	131:142 (1%) 165:176 (1%)	view
11	x 2	packages/expect/src packages/expect/src	spyMatchers.ts spyMatchers.ts	466:476 (1%) 504:514 (1%)	view
11	x 2	packages/babel-jest/src packages/babel-jest/src	index.ts index.ts	202:213 (5%) 216:227 (5%)	view
11	x 2	packages/jest-circus/src/legacy-code-todo-rewrite packages/jest-jasmine2/src	jestAdapter.ts index.ts	49:69 (13%) 98:117 (8%)	view
11	x 2	packages/jest-resolve/src packages/jest-resolve/src	resolver.ts resolver.ts	226:237 (1%) 300:311 (1%)	view
11	x 2	packages/expect/src packages/expect/src	toThrowMatchers.ts toThrowMatchers.ts	163:174 (2%) 338:349 (2%)	view
11	x 2	packages/expect/src packages/expect/src	matchers.ts matchers.ts	454:465 (1%) 558:569 (1%)	view
10	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	ChildProcessWorker.ts NodeThreadsWorker.ts	258:274 (6%) 224:240 (6%)	view
10	x 2	packages/pretty-format/src/plugins packages/pretty-format/src/plugins	Immutable.ts Immutable.ts	28:37 (5%) 133:142 (5%)	view
10	x 2	packages/jest-transform/src packages/jest-transform/src	ScriptTransformer.ts ScriptTransformer.ts	146:157 (1%) 184:196 (1%)	view
10	x 2	packages/expect/src packages/expect/src	spyMatchers.ts spyMatchers.ts	821:830 (1%) 1057:1066 (1%)	view
10	x 2	packages/diff-sequences/perf packages/diff-sequences/perf	index.js index.js	28:39 (8%) 58:69 (8%)	view
10	x 2	packages/jest-transform/src packages/jest-transform/src	types.ts types.ts	81:91 (11%) 116:126 (11%)	view
10	x 2	packages/jest-core/src packages/jest-core/src	FailedTestsInteractiveMode.ts FailedTestsInteractiveMode.ts	120:132 (8%) 148:160 (8%)	view

Duplicated Units

The list of top 3 duplicated units.

See data for all 3 unit duplicates...

Size	#	Folders	Files	Lines	Code
18	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	threadChild.ts processChild.ts	147:169 145:167	view
16	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	threadChild.ts processChild.ts	116:140 114:138	view
6	x 2	packages/jest-worker/src/workers packages/jest-worker/src/workers	threadChild.ts processChild.ts	99:109 97:107	view