File age measurements show the distribution of file ages (days since the first commit) and the recency of file updates (days since the latest commit).

Summary

Number of files: 808
Daily file updates (only one update per file and date counted): 9084
First update: 2013-05-28
Latest update: 2022-04-01
Days between first and latest update: 3231 (461 weeks, estimated 2305 working days)
Active days (at least one file change): 2635
Data:

Organized per file

File Change History Overall

File Age Distribution Overall

Days since first update

There are 808 files with 106,394 lines of code in files.

705 files that are 366+ days old (102,336 lines of code)
52 files that are 181-365 days old (2,495 lines of code)
33 files that are 91-180 days old (910 lines of code)
18 files that are 31-90 days old (653 lines of code)
0 files that are 1-30 days old (0 lines of code)

Legend:

366+

181-365

91-180

31-90

1-30

explore: zoomable circles

Latest Change Distribution Overall

Days since last update

There are 808 files with 106,394 lines of code in files.

473 files have been last changed 366+ days ago (41,704 lines of code)
139 files have been last changed 181-365 days ago (11,806 lines of code)
76 files have been last changed 91-180 days ago (9,080 lines of code)
86 files have been last changed 31-90 days ago (22,276 lines of code)
34 files have been last changed 1-30 days ago (21,528 lines of code)

Legend:

366+

181-365

91-180

31-90

1-30

explore: zoomable circles

File Change History per File Extension

js, json, css, html, md, gitignore, snap, yml, svg, ts, sh, cpp, h, eslintignore, gitattributes, watchmanconfig, editorconfig, toml, txt, mjs, coffee, prettierignore, gyp

File Age Distribution per Extension

Days since first update

366+

181-365

91-180

31-90

1-30

Latest Change Distribution per Extension

Days since last update

366+

181-365

91-180

31-90

1-30

File Change History per Logical Decomposition

primary

primary (file age distribution)

Days since first update

366+

181-365

91-180

31-90

1-30

primary (latest change distribution)

Days since last update

366+

181-365

91-180

31-90

1-30

Oldest Files (Top 50)

File	# lines	# units	last modified (days ago)	created (days ago)	# changes	# contributors
preprocessor.js in scripts/jest	87	1	166	2463	48	23
thread-local.h in scripts/perf-counters/src	502	37	1315	2400	8	8
hardware-counter.cpp in scripts/perf-counters/src	366	30	1315	2400	8	8
portability.h in scripts/perf-counters/src	99	-	1315	2400	8	8
hardware-counter.h in scripts/perf-counters/src	75	13	1315	2400	8	8
thread-local.cpp in scripts/perf-counters/src	74	5	1315	2400	8	8
perf-counters.cpp in scripts/perf-counters/src	35	3	1315	2400	8	8
gyp binding.gyp in scripts/perf-counters	15	-	2277	2400	3	3
index.js in scripts/perf-counters	2	-	2277	2400	3	3
jsc-perf.cpp in scripts/perf-counters/src	175	6	1315	2388	8	8
invertObject.js in scripts/error-codes	11	1	1315	2144	6	6
Types.js in scripts/error-codes	1	-	827	2144	5	5
style.css in fixtures/dom/src	260	-	1247	1925	13	7
index.js in fixtures/dom/src/components/fixtures/selects	208	4	838	1925	14	11
index.js in fixtures/dom/src/components/fixtures/text-inputs	146	2	1416	1925	13	8
Header.js in fixtures/dom/src/components	105	6	742	1925	28	16
index.js in fixtures/dom/src/components/fixtures/textareas	79	1	940	1925	7	6
index.js in fixtures/dom/src/components/fixtures	43	3	1340	1925	19	10
index.js in fixtures/dom/src/components/fixtures/range-inputs	28	-	1313	1925	5	3
index.html in fixtures/dom/public	14	-	1716	1925	4	5
index.js in fixtures/dom/src	11	-	1620	1925	5	4
App.js in fixtures/dom/src/components	11	-	1129	1925	7	4
build-all.js in fixtures/packaging	39	1	1639	1922	5	4
TestCase.js in fixtures/dom/src/components	133	4	1620	1870	7	5
index.js in fixtures/dom/src/components/fixtures/input-change-events	98	1	1608	1870	8	6
RangeKeyboardFixture.js in fixtures/dom/src/components/fixtures/input-change-events	67	4	1614	1870	6	5
InputPlaceholderFixture.js in fixtures/dom/src/components/fixtures/input-change-events	47	1	1614	1870	5	5
tags.js in fixtures/dom/src	45	1	1323	1870	6	6
RadioClickFixture.js in fixtures/dom/src/components/fixtures/input-change-events	37	1	1614	1870	5	5
FixtureSet.js in fixtures/dom/src/components	15	-	1313	1870	7	6
propTypes.js in fixtures/dom/src/components	12	1	1726	1870	5	4
Fixture.js in fixtures/dom/src/components	9	-	1351	1870	6	6
index.js in scripts/prettier	67	-	281	1857	24	15
index.js in fixtures/dom/src/components/fixtures/number-inputs	152	-	1597	1845	8	6
NumberTestCase.js in fixtures/dom/src/components/fixtures/number-inputs	36	1	1620	1845	5	5
index.js in fixtures/dom/src/components/fixtures/buttons	40	2	838	1843	7	6
PasswordTestCase.js in fixtures/dom/src/components/fixtures/password-inputs	34	1	1620	1842	5	5
index.js in fixtures/dom/src/components/fixtures/password-inputs	26	1	1341	1842	6	6
Fibers.js in fixtures/fiber-debugger/src	380	6	588	1838	9	7
App.js in fixtures/fiber-debugger/src	244	5	827	1838	8	6
index.html in fixtures/fiber-triangle	215	-	1239	1838	4	4
describeFibers.js in fixtures/fiber-debugger/src	104	15	588	1838	6	5
Editor.js in fixtures/fiber-debugger/src	36	2	1738	1838	2	2
index.html in fixtures/fiber-debugger/public	13	-	1838	1838	1	1
index.css in fixtures/fiber-debugger/src	13	-	1838	1838	1	1
index.js in fixtures/fiber-debugger/src	5	-	1738	1838	2	2
bundles.js in scripts/rollup	898	3	51	1836	182	34
build.js in scripts/rollup	637	19	50	1836	93	29
packaging.js in scripts/rollup	218	14	51	1836	42	12
stats.js in scripts/rollup	110	5	1051	1836	13	6

Files Not Recently Changed (Top 50)

File	# lines	# units	last modified (days ago)	created (days ago)	# changes	# contributors
index.js in scripts/perf-counters	2	-	2277	2400	3	3
gyp binding.gyp in scripts/perf-counters	15	-	2277	2400	3	3
index.css in fixtures/fiber-debugger/src	13	-	1838	1838	1	1
index.html in fixtures/fiber-debugger/public	13	-	1838	1838	1	1
index.html in fixtures/packaging/systemjs-builder/dev	6	-	1836	1836	1	1
index.html in fixtures/packaging/systemjs-builder/prod	6	-	1836	1836	1	1
index.html in fixtures/packaging/webpack-alias/dev	6	-	1836	1836	1	1
index.html in fixtures/packaging/webpack-alias/prod	6	-	1836	1836	1	1
index.html in fixtures/packaging/browserify/dev	6	-	1836	1836	1	1
index.html in fixtures/packaging/browserify/prod	6	-	1836	1836	1	1
index.html in fixtures/packaging/brunch/dev	7	-	1836	1836	1	1
index.html in fixtures/packaging/brunch/prod	7	-	1836	1836	1	1
index.html in fixtures/packaging/rjs/dev	7	-	1836	1836	1	1
index.html in fixtures/packaging/rjs/prod	7	-	1836	1836	1	1
config.js in fixtures/packaging/brunch/dev	10	-	1836	1836	1	1
config.js in fixtures/packaging/brunch/prod	10	-	1836	1836	1	1
build.js in fixtures/packaging/systemjs-builder/dev	11	-	1836	1836	1	1
build.js in fixtures/packaging/systemjs-builder/prod	11	-	1836	1836	1	1
index.html in fixtures/art	17	-	1836	1836	1	1
index.html in fixtures/ssr/public	13	-	1813	1813	1	1
style.css in scripts/bench/benchmarks/hacker-news	48	-	1802	1802	1	1
app.js in fixtures/art	5	-	1738	1836	2	2
index.js in fixtures/fiber-debugger/src	5	-	1738	1838	2	2
Editor.js in fixtures/fiber-debugger/src	36	2	1738	1838	2	2
input.js in fixtures/packaging/systemjs-builder/dev	6	-	1726	1836	3	3
input.js in fixtures/packaging/systemjs-builder/prod	6	-	1726	1836	3	3
input.js in fixtures/packaging/webpack-alias/dev	6	-	1726	1836	3	3
input.js in fixtures/packaging/webpack-alias/prod	6	-	1726	1836	3	3
input.js in fixtures/packaging/brunch/dev	6	-	1726	1836	3	3
initialize.js in fixtures/packaging/brunch/dev/app	6	-	1726	1836	3	3
input.js in fixtures/packaging/brunch/prod	6	-	1726	1836	3	3
initialize.js in fixtures/packaging/brunch/prod/app	6	-	1726	1836	3	3
input.js in fixtures/packaging/rjs/dev	6	1	1726	1836	3	3
input.js in fixtures/packaging/rjs/prod	6	1	1726	1836	3	3
input.js in fixtures/packaging/browserify/dev	6	-	1726	1836	3	3
input.js in fixtures/packaging/browserify/prod	6	-	1726	1836	3	3
propTypes.js in fixtures/dom/src/components	12	1	1726	1870	5	4
index.html in fixtures/dom/public	14	-	1716	1925	4	5
NumberInputExtraZeroes.js in fixtures/dom/src/components/fixtures/number-inputs	22	-	1716	1751	3	3
NumberInputDecimal.js in fixtures/dom/src/components/fixtures/number-inputs	25	-	1716	1771	3	3
hit-box.js in fixtures/dom/src/components/fixtures/event-pooling	27	-	1715	1715	1	1
index.css in fixtures/attribute-behavior/src	7	-	1694	1694	1	1
index.html in fixtures/attribute-behavior/public	17	-	1694	1694	1	1
IssueList.js in fixtures/dom/src/components	21	2	1687	1687	1	1
index.js in fixtures/attribute-behavior/src	5	-	1686	1694	4	3
server.js in scripts/bench	67	5	1661	1802	3	3
index.js in packages/react/npm	6	-	1639	1639	1	1
build-all.js in fixtures/packaging	39	1	1639	1922	5	4
index.js in fixtures/dom/src	11	-	1620	1925	5	4
mouse-move.js in fixtures/dom/src/components/fixtures/event-pooling	33	-	1620	1715	2	2

Most Recently Created Files (Top 50)

File	# lines	# units	last modified (days ago)	created (days ago)	# changes	# contributors
ReactServerContext.js in packages/react/src	77	2	38	38	1	1
ReactServerContextRegistry.js in packages/shared	13	1	38	38	1	1
ReactServerContextRegistry.js in packages/react/src	4	-	38	38	1	1
ReactFiberTransition.new.js in packages/react-reconciler/src	97	8	45	45	1	1
ReactFiberTransition.old.js in packages/react-reconciler/src	97	8	45	45	1	1
ReactFiberTransitionPool.old.js in packages/react-reconciler/src	97	8	45	45	1	1
ReactFiberTracingMarkerComponent.old.js in packages/react-reconciler/src	58	1	50	50	1	1
transform-object-assign.js in scripts/babel	38	4	50	50	1	1
assign.js in packages/shared	2	-	50	50	1	1
ReactSharedSubset.experimental.js in packages/react/src	31	-	51	51	1	1
react.shared-subset.js in packages/react/npm	6	-	51	51	1	1
ReactSharedSubset.js in packages/react/src	3	-	51	51	1	1
ReactFiberTracingMarkerComponent.new.js in packages/react-reconciler/src	58	1	50	57	2	1
unstable_testing.modern.fb.js in packages/react-dom	13	-	65	65	1	1
unstable_testing.experimental.js in packages/react-dom	13	-	65	65	1	1
unstable_testing.classic.fb.js in packages/react-dom	13	-	65	65	1	1
unstable_testing.stable.js in packages/react-dom	1	-	65	65	1	1
TimelineNotSupported.css in packages/react-devtools-timeline/src	32	-	77	77	1	1
e2e.html in packages/react-devtools-shell	40	-	121	121	1	1
multi.html in packages/react-devtools-shell	56	-	122	122	1	1
check-release-dependencies.js in scripts/release	49	2	128	128	1	1
InspectedElementStyleXPlugin.css in packages/react-devtools-shared/src/devtools/views/Components	6	-	128	128	1	1
SearchInput.css in packages/react-devtools-shared/src/devtools/views	38	-	133	133	1	1
playwright.config.js in packages/react-devtools-inline	10	-	115	151	2	2
Tooltip.css in packages/react-devtools-shared/src/devtools/views/Components/reach-ui	11	-	158	158	1	1
EventTooltip.css in packages/react-devtools-timeline/src	76	-	162	162	1	1
Timeline.css in packages/react-devtools-timeline/src	52	-	162	162	1	1
registerInternalModuleEnd.js in scripts/rollup/wrappers	8	-	162	162	1	1
registerInternalModuleBegin.js in scripts/rollup/wrappers	8	-	162	162	1	1
CanvasPage.css in packages/react-devtools-timeline/src	7	-	162	162	1	1
importFile.worker.js in packages/react-devtools-timeline/src/import-worker	2	-	162	162	1	1
ReactFiberTreeContext.new.js in packages/react-reconciler/src	141	12	151	165	3	2
ReactFiberTreeContext.old.js in packages/react-reconciler/src	141	12	151	165	3	2
useSyncExternalStoreWithSelector.js in packages/use-sync-external-store/src	77	1	166	166	1	1
useSyncExternalStoreShimClient.js in packages/use-sync-external-store/src	67	2	53	166	2	2
useSyncExternalStoreShimServer.js in packages/use-sync-external-store/src	7	1	166	166	1	1
useSyncExternalStoreShim.js in packages/use-sync-external-store/src	7	-	166	166	1	1
with-selector.js in packages/use-sync-external-store/npm	6	-	166	166	1	1
with-selector.js in packages/use-sync-external-store/npm/shim	6	-	166	166	1	1
index.js in packages/use-sync-external-store/npm/shim	6	-	166	166	1	1
index.native.js in packages/use-sync-external-store/npm/shim	6	-	166	166	1	1
useSyncExternalStore.forward-to-shim.js in packages/use-sync-external-store/src/forks	3	-	166	166	1	1
useSyncExternalStore.forward-to-built-in.js in packages/use-sync-external-store/src/forks	3	-	166	166	1	1
with-selector.js in packages/use-sync-external-store	2	-	166	166	1	1
index.js in packages/use-sync-external-store/shim/with-selector	2	-	166	166	1	1
index.js in packages/use-sync-external-store/shim	2	-	166	166	1	1
index.native.js in packages/use-sync-external-store/shim	2	-	166	166	1	1
isServerEnvironment.js in packages/use-sync-external-store/src	2	-	166	166	1	1
isServerEnvironment.native.js in packages/use-sync-external-store/src/forks	1	-	166	166	1	1
ReactFiberAct.new.js in packages/react-reconciler/src	33	2	175	179	2	1

Most Recently Changed Files (Top 50)

File	# lines	# units	last modified (days ago)	created (days ago)	# changes	# contributors
render.js in fixtures/ssr2/server	62	6	14	314	9	5
build.js in fixtures/ssr2/scripts	43	-	14	314	2	2
prepare-release.js in scripts/devtools	218	11	16	233	5	3
index.experimental.js in packages/react	45	-	16	780	28	11
ReactVersions.js in root	30	-	16	316	12	2
Chrome.js in fixtures/ssr/src/components	46	1	21	1813	9	7
build-and-test.js in scripts/devtools	17	-	21	233	4	3
index.js in fixtures/ssr/src	4	-	21	1813	10	5
ReactFiberReconciler.old.js in packages/react-reconciler/src	662	19	22	764	63	12
ReactFiberReconciler.new.js in packages/react-reconciler/src	662	19	22	736	60	12
ReactFeatureFlags.www.js in packages/shared/forks	70	-	22	1597	195	31
ReactFeatureFlags.native-fb.js in packages/shared/forks	64	-	22	1458	171	31
ReactFeatureFlags.testing.js in packages/shared/forks	63	-	22	801	108	17
ReactFeatureFlags.test-renderer.www.js in packages/shared/forks	63	-	22	1379	164	27
ReactFeatureFlags.native-oss.js in packages/shared/forks	63	-	22	1458	165	30
ReactFeatureFlags.testing.www.js in packages/shared/forks	63	-	22	792	107	17
ReactFeatureFlags.test-renderer.js in packages/shared/forks	63	-	22	1479	168	30
ReactFeatureFlags.test-renderer.native.js in packages/shared/forks	62	-	22	625	72	12
ReactFeatureFlags.js in packages/shared	59	-	22	1638	199	33
ReactFeatureFlags.www-dynamic.js in packages/shared/forks	26	-	22	770	74	11
shared.css in packages/react-devtools-shared/src/devtools/views/ErrorBoundary	115	-	23	365	4	1
ReactVersion.js in packages/shared	1	-	23	1638	50	12
isValidElementType.js in packages/shared	60	1	25	1478	35	14
ReactFiberBeginWork.old.js in packages/react-reconciler/src	3191	62	26	736	69	14
ReactFiberBeginWork.new.js in packages/react-reconciler/src	3191	62	26	736	83	15
ReactFiberCommitWork.old.js in packages/react-reconciler/src	2626	74	26	736	69	14
ReactFiberCommitWork.new.js in packages/react-reconciler/src	2626	74	26	736	88	14
ReactFiberWorkLoop.new.js in packages/react-reconciler/src	2268	75	26	736	161	21
ReactFiberWorkLoop.old.js in packages/react-reconciler/src	2268	75	26	736	145	23
ReactFiberCompleteWork.old.js in packages/react-reconciler/src	1206	21	26	736	49	13
ReactFiberCompleteWork.new.js in packages/react-reconciler/src	1206	21	26	736	61	14
ReactFiberRoot.old.js in packages/react-reconciler/src	160	2	26	736	34	6
ReactFiberRoot.new.js in packages/react-reconciler/src	160	2	26	736	36	6
download-build-artifacts.js in scripts/release/shared-commands	65	1	30	849	10	3
ReactFiber.old.js in packages/react-reconciler/src	687	26	31	736	36	10
ReactFiber.new.js in packages/react-reconciler/src	687	26	31	736	42	11
ReactFiberHooks.new.js in packages/react-reconciler/src	2970	75	38	736	80	16
ReactFiberHooks.old.js in packages/react-reconciler/src	2970	75	38	736	74	17
ReactFiberNewContext.old.js in packages/react-reconciler/src	532	16	38	736	16	6
ReactFiberNewContext.new.js in packages/react-reconciler/src	532	16	38	736	18	6
ReactTypes.js in packages/shared	124	-	38	1633	89	17
React.js in packages/react/src	118	-	38	1639	81	21
getComponentNameFromType.js in packages/shared	113	3	38	406	5	5
ReactContext.js in packages/react/src	103	12	38	1525	21	11
ReactFiberCacheComponent.old.js in packages/react-reconciler/src	94	5	38	483	8	4
ReactFiberCacheComponent.new.js in packages/react-reconciler/src	94	5	38	483	8	4
ReactServerContext.js in packages/react/src	77	2	38	38	1	1
index.js in packages/react	70	-	38	1836	42	17
index.classic.fb.js in packages/react	56	-	38	780	27	9
index.modern.fb.js in packages/react	55	-	38	780	27	9