FCA Hubs

Evidence-derived hubs are ranked from coverage artifacts, not static graph scores.

Substrate hubs

Substrate hubs are foundational concepts whose intent includes at least 90% of all collected tests. The percentage is breadth, not a quality score. They are auto-suppressed from PR impact summaries because they describe shared plumbing rather than a specific behavior.

Concept	Intent share
map.ts ×97 12741 tests · 3334 LOC · 18 files · introduces 0 tests · 3334 LOC · 18 files	100%
lifecycle.ts ×1 12733 tests · 3337 LOC · 18 files · introduces 0 tests · 3 LOC · 1 file	100%
lifecycle.ts ×1 12731 tests · 3339 LOC · 18 files · introduces 0 tests · 2 LOC · 1 file	100%
lifecycle.ts ×1 12729 tests · 3339 LOC · 18 files · introduces 0 tests · 2 LOC · 1 file	100%
lifecycle.ts ×4 12727 tests · 3349 LOC · 18 files · introduces 0 tests · 8 LOC · 1 file	100%
lifecycle.ts ×6 12718 tests · 3353 LOC · 18 files · introduces 0 tests · 16 LOC · 1 file	100%
lifecycle.ts ×2 12716 tests · 3359 LOC · 18 files · introduces 0 tests · 4 LOC · 1 file	100%
utils.ts ×3 12714 tests · 3378 LOC · 18 files · introduces 0 tests · 9 LOC · 1 file	100%

Load-bearing concepts

showing 25 of 20961

Concept	Test packages
map.ts ×97 12741 tests · 3334 LOC · 18 files · introduces 0 tests · 3334 LOC · 18 files	522 packages
lifecycle.ts ×1 12733 tests · 3337 LOC · 18 files · introduces 0 tests · 3 LOC · 1 file	522 packages
lifecycle.ts ×1 12731 tests · 3339 LOC · 18 files · introduces 0 tests · 2 LOC · 1 file	522 packages
lifecycle.ts ×1 12729 tests · 3339 LOC · 18 files · introduces 0 tests · 2 LOC · 1 file	522 packages
lifecycle.ts ×4 12727 tests · 3349 LOC · 18 files · introduces 0 tests · 8 LOC · 1 file	522 packages
lifecycle.ts ×6 12718 tests · 3353 LOC · 18 files · introduces 0 tests · 16 LOC · 1 file	522 packages
lifecycle.ts ×2 12716 tests · 3359 LOC · 18 files · introduces 0 tests · 4 LOC · 1 file	522 packages
utils.ts ×3 12714 tests · 3378 LOC · 18 files · introduces 0 tests · 9 LOC · 1 file	522 packages
lifecycle.ts ×1 11366 tests · 3351 LOC · 18 files · introduces 0 tests · 2 LOC · 1 file	481 packages
uri.test\|title=URI URI#file, win-speciale\|occurrence=1, charCode.test\|title=CharCode has good values\|occurrence=1, +2 11353 tests · 3380 LOC · 18 files · introduces 4 tests · 0 LOC · 0 files	481 packages
lazy.ts ×3 10898 tests · 3371 LOC · 19 files · introduces 0 tests · 37 LOC · 1 file	442 packages
lazy.ts ×1 10890 tests · 3373 LOC · 19 files · introduces 0 tests · 2 LOC · 1 file	442 packages
linkedList.ts ×13 10859 tests · 3378 LOC · 19 files · introduces 0 tests · 44 LOC · 1 file	440 packages
event.ts ×93 10852 tests · 4242 LOC · 21 files · introduces 0 tests · 864 LOC · 2 files	437 packages
cancellation.ts ×18 10744 tests · 4332 LOC · 22 files · introduces 0 tests · 90 LOC · 1 file	431 packages
uint.ts ×2 10619 tests · 3377 LOC · 19 files · introduces 0 tests · 43 LOC · 1 file	427 packages
strings.ts ×101 10556 tests · 4956 LOC · 26 files · introduces 0 tests · 542 LOC · 2 files	426 packages
network.ts ×20 7766 tests · 5248 LOC · 27 files · introduces 0 tests · 292 LOC · 1 file	398 packages
extpath.ts ×17 7335 tests · 5047 LOC · 27 files · introduces 0 tests · 91 LOC · 1 file	390 packages
resources.ts ×23 7273 tests · 5592 LOC · 29 files · introduces 0 tests · 253 LOC · 1 file	387 packages
cancellation.test\|title=CancellationToken None\|occurrence=1 9382 tests · 4378 LOC · 22 files · introduces 1 test · 0 LOC · 0 files	386 packages
strings.test\|title=Strings trimWhitespace\|occurrence=1 9270 tests · 5002 LOC · 26 files · introduces 1 test · 0 LOC · 0 files	384 packages
nls.ts ×6 6886 tests · 3362 LOC · 18 files · introduces 0 tests · 13 LOC · 1 file	374 packages
nls.ts ×1 6839 tests · 3363 LOC · 18 files · introduces 0 tests · 1 LOC · 1 file	369 packages
instantiation.ts ×5 6860 tests · 3460 LOC · 19 files · introduces 0 tests · 111 LOC · 1 file	357 packages

Largest code-introducing concepts

Code projection ranked only by canonical introduced ranges.

showing 25 of 15843

Concept	Introduced ranges
extHostTypes.ts ×270 103 tests · 68881 LOC · 244 files · introduces 0 tests · 6339 LOC · 23 files	811 ranges
textModel.ts ×190 861 tests · 35636 LOC · 206 files · introduces 0 tests · 2948 LOC · 35 files	618 ranges
map.ts ×97 12741 tests · 3334 LOC · 18 files · introduces 0 tests · 3334 LOC · 18 files	462 ranges
abstractSynchronizer.ts ×49 348 tests · 21433 LOC · 133 files · introduces 0 tests · 2102 LOC · 24 files	413 ranges
devToolsLogger.ts ×24 3467 tests · 6426 LOC · 59 files · introduces 0 tests · 1971 LOC · 36 files	312 ranges
debugModel.ts ×185 9 tests · 23428 LOC · 114 files · introduces 0 tests · 988 LOC · 5 files	311 ranges
extHostExtensionService.ts ×64 33 tests · 81803 LOC · 296 files · introduces 0 tests · 1246 LOC · 16 files	231 ranges
agentService.ts ×122 483 tests · 45592 LOC · 285 files · introduces 0 tests · 1518 LOC · 7 files	218 ranges
copilotAgent.ts ×185 171 tests · 49789 LOC · 297 files · introduces 0 tests · 1576 LOC · 3 files	216 ranges
chatModel.ts ×179 252 tests · 41154 LOC · 175 files · introduces 0 tests · 1630 LOC · 4 files	206 ranges
async.ts ×202 5963 tests · 6855 LOC · 31 files · introduces 0 tests · 1247 LOC · 2 files	203 ranges
contextkey.ts ×201 5850 tests · 6073 LOC · 29 files · introduces 0 tests · 796 LOC · 1 file	201 ranges
codexAgent.ts ×158 13 tests · 35765 LOC · 187 files · introduces 0 tests · 1640 LOC · 4 files	176 ranges
taskConfiguration.ts ×80 59 tests · 20835 LOC · 80 files · introduces 0 tests · 2079 LOC · 4 files	166 ranges
extHostTerminalService.ts ×109 42 tests · 75317 LOC · 255 files · introduces 0 tests · 894 LOC · 5 files	163 ranges
copilotAgentSession.ts ×141 409 tests · 42083 LOC · 240 files · introduces 0 tests · 1263 LOC · 3 files	152 ranges
extHostMcp.ts ×43 26 tests · 83393 LOC · 310 files · introduces 0 tests · 874 LOC · 7 files	152 ranges
remoteAgentConnection.ts ×53 6 tests · 79092 LOC · 274 files · introduces 0 tests · 823 LOC · 7 files	149 ranges
claudeAgent.ts ×91 200 tests · 53380 LOC · 346 files · introduces 0 tests · 1570 LOC · 5 files	145 ranges
chatServiceImpl.ts ×75 76 tests · 68617 LOC · 309 files · introduces 0 tests · 1063 LOC · 11 files	130 ranges
ipc.net.ts ×73 52 tests · 8774 LOC · 40 files · introduces 0 tests · 802 LOC · 2 files	124 ranges
copilotAgentSession.ts ×67 257 tests · 43469 LOC · 242 files · introduces 0 tests · 355 LOC · 2 files	114 ranges
strings.ts ×101 10556 tests · 4956 LOC · 26 files · introduces 0 tests · 542 LOC · 2 files	110 ranges
fileSearch.ts ×31 32 tests · 78836 LOC · 282 files · introduces 0 tests · 624 LOC · 9 files	108 ranges
terminalSandboxEngine.ts ×71 489 tests · 11917 LOC · 56 files · introduces 0 tests · 746 LOC · 6 files	107 ranges

Largest test-introducing concepts

Test ranking uses canonical introduced tests; code and test units are never combined.

showing 25 of 8906

Concept	Introduced tests
stringEdit.test\|title=Edit tryRebase invariants case6\|occurrence=1, stringEdit.test\|title=Edit tryRebase invariants case10\|occurrence=1, +289 557 tests · 6599 LOC · 39 files · introduces 291 tests · 0 LOC · 0 files	291 tests
stringEdit.test\|title=Edit tryRebase invariants case0\|occurrence=1, stringEdit.test\|title=Edit tryRebase invariants case7\|occurrence=1, +172 914 tests · 6576 LOC · 39 files · introduces 174 tests · 0 LOC · 0 files	174 tests
stringEdit.test\|title=Edit tryRebase invariants case2\|occurrence=1, stringEdit.test\|title=Edit tryRebase invariants case4\|occurrence=1, +139 211 tests · 6683 LOC · 39 files · introduces 141 tests · 0 LOC · 0 files	141 tests
stringEdit.test\|title=Edit StringEdit compose case11\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case18\|occurrence=1, +114 538 tests · 6613 LOC · 39 files · introduces 116 tests · 0 LOC · 0 files	116 tests
stringEdit.test\|title=Edit tryRebase invariants case9\|occurrence=1, stringEdit.test\|title=Edit tryRebase invariants case26\|occurrence=1, +84 643 tests · 6594 LOC · 39 files · introduces 86 tests · 0 LOC · 0 files	86 tests
stringEdit.test\|title=Edit tryRebase invariants case21\|occurrence=1, stringEdit.test\|title=Edit tryRebase invariants case34\|occurrence=1, +77 636 tests · 6594 LOC · 39 files · introduces 79 tests · 0 LOC · 0 files	79 tests
stringEdit.test\|title=Edit StringEdit compose case13\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case20\|occurrence=1, +54 252 tests · 6653 LOC · 39 files · introduces 56 tests · 0 LOC · 0 files	56 tests
stringEdit.test\|title=Edit StringEdit compose case17\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case57\|occurrence=1, +53 328 tests · 6633 LOC · 39 files · introduces 55 tests · 0 LOC · 0 files	55 tests
stringEdit.test\|title=Edit StringEdit compose case35\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case38\|occurrence=1, +46 176 tests · 6649 LOC · 39 files · introduces 48 tests · 0 LOC · 0 files	48 tests
stringEdit.test\|title=Edit tryRebase invariants case18\|occurrence=1, stringEdit.test\|title=Edit tryRebase invariants case41\|occurrence=1, +42 284 tests · 6679 LOC · 39 files · introduces 44 tests · 0 LOC · 0 files	44 tests
stringEdit.test\|title=Edit StringEdit compose case12\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case21\|occurrence=1, +39 802 tests · 6626 LOC · 39 files · introduces 41 tests · 0 LOC · 0 files	41 tests
stringEdit.test\|title=Edit StringEdit compose case16\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case73\|occurrence=1, +38 456 tests · 6608 LOC · 39 files · introduces 40 tests · 0 LOC · 0 files	40 tests
stringEdit.test\|title=Edit StringEdit compose case7\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case54\|occurrence=1, +34 107 tests · 6615 LOC · 39 files · introduces 36 tests · 0 LOC · 0 files	36 tests
types.test\|title=Types isOneOf failure any both\|occurrence=1, types.test\|title=Types isOneOf failure any item\|occurrence=1, +34 73 tests · 3387 LOC · 18 files · introduces 36 tests · 0 LOC · 0 files	36 tests
stringEdit.test\|title=Edit StringEdit compose case10\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case32\|occurrence=1, +32 139 tests · 6658 LOC · 39 files · introduces 34 tests · 0 LOC · 0 files	34 tests
stringEdit.test\|title=Edit StringEdit compose case9\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case29\|occurrence=1, +31 416 tests · 6610 LOC · 39 files · introduces 33 tests · 0 LOC · 0 files	33 tests
stringEdit.test\|title=Edit tryRebase invariants case27\|occurrence=1, stringEdit.test\|title=Edit tryRebase invariants case51\|occurrence=1, +28 36 tests · 6733 LOC · 39 files · introduces 30 tests · 0 LOC · 0 files	30 tests
stringEdit.test\|title=Edit StringEdit compose case102\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case154\|occurrence=1, +26 90 tests · 6660 LOC · 39 files · introduces 28 tests · 0 LOC · 0 files	28 tests
stringEdit.test\|title=Edit tryRebase invariants case19\|occurrence=1, stringEdit.test\|title=Edit tryRebase invariants case58\|occurrence=1, +26 34 tests · 6685 LOC · 39 files · introduces 28 tests · 0 LOC · 0 files	28 tests
stringEdit.test\|title=Edit StringEdit compose case93\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case137\|occurrence=1, +25 227 tests · 6650 LOC · 39 files · introduces 27 tests · 0 LOC · 0 files	27 tests
stringEdit.test\|title=Edit StringEdit compose case27\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case118\|occurrence=1, +24 195 tests · 6649 LOC · 39 files · introduces 26 tests · 0 LOC · 0 files	26 tests
user response as the CAPI base\|occurrence=1, copilotApiService.test\|title=CopilotApiService Request Format sends model in the body\|occurrence=1, +21 34 tests · 20187 LOC · 84 files · introduces 23 tests · 0 LOC · 0 files	23 tests
osx\|occurrence=1, powershell mapping\|occurrence=1, +18 24 tests · 15010 LOC · 58 files · introduces 20 tests · 0 LOC · 0 files	20 tests
stringEdit.test\|title=Edit StringEdit compose case39\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case162\|occurrence=1, +18 108 tests · 6658 LOC · 39 files · introduces 20 tests · 0 LOC · 0 files	20 tests
stringEdit.test\|title=Edit StringEdit compose case8\|occurrence=1, stringEdit.test\|title=Edit StringEdit compose case69\|occurrence=1, +18 436 tests · 6642 LOC · 39 files · introduces 20 tests · 0 LOC · 0 files	20 tests