Places in code with 6 or more lines that are exactly the same.
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.
- To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:
- Avoid Repetition, MartinFlower.com (IEEE Software article)
- Refactoring duplicated code, sourcemaking.com
- Beck Design Rules, MartinFowler.com
- DRY (Don't Repeat Yourself) Principle, Wikipedia
- The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
- Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:
- "Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"
- Reducing Coupling, MartinFlower.com (IEEE Software article):
- "There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."
Duplication Overall
- 8% duplication:
- 74,057 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 6,132 duplicated lines
- 1,478 duplicates
Duplication per Extension
Duplication per Component (primary)
Duplication Between Components (50+ lines)
Open 3D force graph...
Show more details on duplication between components...
From Component
--> To Component
Duplicated
Lines
File Pairs
Details
packages/database (<1%)
--> packages/firestore (<1%)
168
6 file pairs
details...
packages/analytics (5%)
--> packages/remote-config (9%)
158
3 file pairs
details...
packages/firestore-compat (5%)
--> packages/firestore (<1%)
156
8 file pairs
details...
packages/firestore (<1%)
--> packages/storage (2%)
128
6 file pairs
details...
packages/database-compat (6%)
--> packages/database (<1%)
119
1 file pair
details...
packages/template (84%)
--> packages/util (3%)
88
1 file pair
details...
packages/app (10%)
--> packages/remote-config (5%)
88
1 file pair
details...
packages/analytics-compat (31%)
--> packages/app-check-compat (27%)
87
2 file pairs
details...
packages/analytics (3%)
--> packages/installations (4%)
84
1 file pair
details...
packages/installations (4%)
--> packages/remote-config (5%)
84
1 file pair
details...
packages/performance-compat (47%)
--> packages/remote-config-compat (31%)
84
1 file pair
details...
packages/analytics (3%)
--> packages/app (10%)
82
1 file pair
details...
packages/functions (7%)
--> packages/remote-config (5%)
81
1 file pair
details...
packages/app-check-compat (25%)
--> packages/app-check (3%)
80
1 file pair
details...
packages/messaging-compat (25%)
--> packages/messaging (2%)
80
2 file pairs
details...
packages/app-check-compat (24%)
--> packages/performance-compat (43%)
78
1 file pair
details...
packages/app-check (3%)
--> packages/performance-compat (43%)
78
1 file pair
details...
packages/app-check-compat (24%)
--> packages/remote-config-compat (29%)
78
1 file pair
details...
packages/app-check (3%)
--> packages/remote-config-compat (29%)
78
1 file pair
details...
packages/installations (3%)
--> packages/performance (2%)
76
1 file pair
details...
packages/analytics (2%)
--> packages/functions (7%)
75
1 file pair
details...
packages/analytics (2%)
--> packages/performance (2%)
74
1 file pair
details...
packages/performance (2%)
--> packages/remote-config (4%)
74
1 file pair
details...
packages/analytics-compat (25%)
--> packages/app-check (2%)
71
1 file pair
details...
packages/app-check (2%)
--> packages/remote-config (4%)
70
2 file pairs
details...
packages/app (8%)
--> packages/installations (3%)
70
1 file pair
details...
packages/messaging (1%)
--> packages/remote-config (4%)
66
2 file pairs
details...
packages/analytics-compat (23%)
--> packages/remote-config-compat (24%)
64
1 file pair
details...
packages/analytics-compat (23%)
--> packages/performance-compat (35%)
64
1 file pair
details...
packages/app-compat (8%)
--> packages/app (7%)
64
2 file pairs
details...
packages/functions (5%)
--> packages/installations (3%)
63
1 file pair
details...
packages/app-check (2%)
--> packages/installations-compat (27%)
62
1 file pair
details...
packages/app-check-compat (19%)
--> packages/installations-compat (27%)
62
1 file pair
details...
packages/app-compat (7%)
--> packages/messaging-compat (19%)
61
1 file pair
details...
packages/installations-compat (26%)
--> packages/performance-compat (33%)
60
1 file pair
details...
packages/installations-compat (26%)
--> packages/remote-config-compat (22%)
60
1 file pair
details...
packages/app (7%)
--> packages/performance-compat (33%)
60
1 file pair
details...
packages/app (7%)
--> packages/remote-config-compat (22%)
60
1 file pair
details...
packages/analytics (2%)
--> packages/messaging (1%)
60
2 file pairs
details...
packages/firestore-compat (2%)
--> packages/storage (<1%)
60
3 file pairs
details...
packages/database-compat (3%)
--> packages/firestore (<1%)
60
4 file pairs
details...
packages/app-check-compat (17%)
--> packages/messaging-compat (18%)
56
1 file pair
details...
packages/app-check-compat (17%)
--> packages/messaging (1%)
56
1 file pair
details...
packages/app-check (2%)
--> packages/messaging-compat (18%)
56
1 file pair
details...
packages/app-check (2%)
--> packages/messaging (1%)
56
1 file pair
details...
packages/app-check-compat (17%)
--> packages/remote-config (3%)
56
1 file pair
details...
packages/messaging-compat (17%)
--> packages/remote-config (3%)
54
1 file pair
details...
packages/functions-compat (23%)
--> packages/functions (5%)
54
1 file pair
details...
packages/app (6%)
--> packages/functions (5%)
54
1 file pair
details...
packages/functions-compat (23%)
--> packages/util (2%)
54
1 file pair
details...
packages/functions-compat (23%)
--> packages/template (51%)
54
1 file pair
details...
packages/analytics-compat (19%)
--> packages/remote-config (3%)
53
1 file pair
details...
packages/analytics-compat (19%)
--> packages/installations-compat (23%)
53
1 file pair
details...
packages/app-check-compat (16%)
--> packages/functions (4%)
52
1 file pair
details...
packages/app-check (2%)
--> packages/functions (4%)
52
1 file pair
details...
packages/functions-compat (22%)
--> packages/messaging-compat (16%)
52
1 file pair
details...
packages/functions-compat (22%)
--> packages/messaging (1%)
52
1 file pair
details...
packages/database (<1%)
--> packages/storage (<1%)
52
3 file pairs
details...
packages/analytics-compat (18%)
--> packages/messaging (1%)
51
1 file pair
details...
packages/analytics-compat (18%)
--> packages/messaging-compat (16%)
51
1 file pair
details...
packages/analytics-compat (17%)
--> packages/functions (4%)
50
1 file pair
details...
packages/functions-compat (21%)
--> packages/remote-config (3%)
50
1 file pair
details...
packages/app-check-compat (15%)
--> packages/functions-compat (21%)
50
1 file pair
details...
packages/app-compat (6%)
--> packages/storage-compat (6%)
50
1 file pair
details...
packages/functions (4%)
--> packages/messaging-compat (16%)
50
1 file pair
details...
packages/app-check (2%)
--> packages/functions-compat (21%)
50
1 file pair
details...
packages/functions (4%)
--> packages/messaging (1%)
50
1 file pair
details...
packages/analytics (1%)
--> packages/app-check-compat (15%)
50
1 file pair
details...
packages/analytics (1%)
--> packages/app-check (2%)
50
1 file pair
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| packages/database (<1%) --> packages/firestore (<1%) |
168 | 6 file pairs | details... |
| packages/analytics (5%) --> packages/remote-config (9%) |
158 | 3 file pairs | details... |
| packages/firestore-compat (5%) --> packages/firestore (<1%) |
156 | 8 file pairs | details... |
| packages/firestore (<1%) --> packages/storage (2%) |
128 | 6 file pairs | details... |
| packages/database-compat (6%) --> packages/database (<1%) |
119 | 1 file pair | details... |
| packages/template (84%) --> packages/util (3%) |
88 | 1 file pair | details... |
| packages/app (10%) --> packages/remote-config (5%) |
88 | 1 file pair | details... |
| packages/analytics-compat (31%) --> packages/app-check-compat (27%) |
87 | 2 file pairs | details... |
| packages/analytics (3%) --> packages/installations (4%) |
84 | 1 file pair | details... |
| packages/installations (4%) --> packages/remote-config (5%) |
84 | 1 file pair | details... |
| packages/performance-compat (47%) --> packages/remote-config-compat (31%) |
84 | 1 file pair | details... |
| packages/analytics (3%) --> packages/app (10%) |
82 | 1 file pair | details... |
| packages/functions (7%) --> packages/remote-config (5%) |
81 | 1 file pair | details... |
| packages/app-check-compat (25%) --> packages/app-check (3%) |
80 | 1 file pair | details... |
| packages/messaging-compat (25%) --> packages/messaging (2%) |
80 | 2 file pairs | details... |
| packages/app-check-compat (24%) --> packages/performance-compat (43%) |
78 | 1 file pair | details... |
| packages/app-check (3%) --> packages/performance-compat (43%) |
78 | 1 file pair | details... |
| packages/app-check-compat (24%) --> packages/remote-config-compat (29%) |
78 | 1 file pair | details... |
| packages/app-check (3%) --> packages/remote-config-compat (29%) |
78 | 1 file pair | details... |
| packages/installations (3%) --> packages/performance (2%) |
76 | 1 file pair | details... |
| packages/analytics (2%) --> packages/functions (7%) |
75 | 1 file pair | details... |
| packages/analytics (2%) --> packages/performance (2%) |
74 | 1 file pair | details... |
| packages/performance (2%) --> packages/remote-config (4%) |
74 | 1 file pair | details... |
| packages/analytics-compat (25%) --> packages/app-check (2%) |
71 | 1 file pair | details... |
| packages/app-check (2%) --> packages/remote-config (4%) |
70 | 2 file pairs | details... |
| packages/app (8%) --> packages/installations (3%) |
70 | 1 file pair | details... |
| packages/messaging (1%) --> packages/remote-config (4%) |
66 | 2 file pairs | details... |
| packages/analytics-compat (23%) --> packages/remote-config-compat (24%) |
64 | 1 file pair | details... |
| packages/analytics-compat (23%) --> packages/performance-compat (35%) |
64 | 1 file pair | details... |
| packages/app-compat (8%) --> packages/app (7%) |
64 | 2 file pairs | details... |
| packages/functions (5%) --> packages/installations (3%) |
63 | 1 file pair | details... |
| packages/app-check (2%) --> packages/installations-compat (27%) |
62 | 1 file pair | details... |
| packages/app-check-compat (19%) --> packages/installations-compat (27%) |
62 | 1 file pair | details... |
| packages/app-compat (7%) --> packages/messaging-compat (19%) |
61 | 1 file pair | details... |
| packages/installations-compat (26%) --> packages/performance-compat (33%) |
60 | 1 file pair | details... |
| packages/installations-compat (26%) --> packages/remote-config-compat (22%) |
60 | 1 file pair | details... |
| packages/app (7%) --> packages/performance-compat (33%) |
60 | 1 file pair | details... |
| packages/app (7%) --> packages/remote-config-compat (22%) |
60 | 1 file pair | details... |
| packages/analytics (2%) --> packages/messaging (1%) |
60 | 2 file pairs | details... |
| packages/firestore-compat (2%) --> packages/storage (<1%) |
60 | 3 file pairs | details... |
| packages/database-compat (3%) --> packages/firestore (<1%) |
60 | 4 file pairs | details... |
| packages/app-check-compat (17%) --> packages/messaging-compat (18%) |
56 | 1 file pair | details... |
| packages/app-check-compat (17%) --> packages/messaging (1%) |
56 | 1 file pair | details... |
| packages/app-check (2%) --> packages/messaging-compat (18%) |
56 | 1 file pair | details... |
| packages/app-check (2%) --> packages/messaging (1%) |
56 | 1 file pair | details... |
| packages/app-check-compat (17%) --> packages/remote-config (3%) |
56 | 1 file pair | details... |
| packages/messaging-compat (17%) --> packages/remote-config (3%) |
54 | 1 file pair | details... |
| packages/functions-compat (23%) --> packages/functions (5%) |
54 | 1 file pair | details... |
| packages/app (6%) --> packages/functions (5%) |
54 | 1 file pair | details... |
| packages/functions-compat (23%) --> packages/util (2%) |
54 | 1 file pair | details... |
| packages/functions-compat (23%) --> packages/template (51%) |
54 | 1 file pair | details... |
| packages/analytics-compat (19%) --> packages/remote-config (3%) |
53 | 1 file pair | details... |
| packages/analytics-compat (19%) --> packages/installations-compat (23%) |
53 | 1 file pair | details... |
| packages/app-check-compat (16%) --> packages/functions (4%) |
52 | 1 file pair | details... |
| packages/app-check (2%) --> packages/functions (4%) |
52 | 1 file pair | details... |
| packages/functions-compat (22%) --> packages/messaging-compat (16%) |
52 | 1 file pair | details... |
| packages/functions-compat (22%) --> packages/messaging (1%) |
52 | 1 file pair | details... |
| packages/database (<1%) --> packages/storage (<1%) |
52 | 3 file pairs | details... |
| packages/analytics-compat (18%) --> packages/messaging (1%) |
51 | 1 file pair | details... |
| packages/analytics-compat (18%) --> packages/messaging-compat (16%) |
51 | 1 file pair | details... |
| packages/analytics-compat (17%) --> packages/functions (4%) |
50 | 1 file pair | details... |
| packages/functions-compat (21%) --> packages/remote-config (3%) |
50 | 1 file pair | details... |
| packages/app-check-compat (15%) --> packages/functions-compat (21%) |
50 | 1 file pair | details... |
| packages/app-compat (6%) --> packages/storage-compat (6%) |
50 | 1 file pair | details... |
| packages/functions (4%) --> packages/messaging-compat (16%) |
50 | 1 file pair | details... |
| packages/app-check (2%) --> packages/functions-compat (21%) |
50 | 1 file pair | details... |
| packages/functions (4%) --> packages/messaging (1%) |
50 | 1 file pair | details... |
| packages/analytics (1%) --> packages/app-check-compat (15%) |
50 | 1 file pair | details... |
| packages/analytics (1%) --> packages/app-check (2%) |
50 | 1 file pair | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 48 | x 2 | packages/analyticspackages/remote-config |  rollup.config.jsrollup.config.js |
30:94 (94%)32:93 (94%) | view |
| 42 | x 2 | packages/analyticspackages/installations | rollup.config.jsrollup.config.js |
37:94 (82%)30:81 (95%) | view |
| 42 | x 2 | packages/installationspackages/remote-config | rollup.config.jsrollup.config.js |
30:81 (95%)39:93 (82%) | view |
| 42 | x 2 | packages/performance-compatpackages/remote-config-compat | rollup.config.jsrollup.config.js |
24:77 (100%)24:77 (100%) | view |
| 41 | x 2 | packages/firestore/src/localpackages/firestore/src/local |  indexeddb_index_manager.tsmemory_index_manager.ts |
113:175 (43%)56:118 (48%) | view |
| 40 | x 2 | packages/app-check-compatpackages/app-check | rollup.config.jsrollup.config.js |
24:75 (100%)24:75 (100%) | view |
| 34 | x 2 | packages/templatepackages/util | rollup.config.jsrollup.config.js |
23:66 (75%)23:66 (75%) | view |
| 33 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto struct.prototimestamp.proto |
1:36 (37%)1:36 (25%) | view |
| 32 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto any.protoempty.proto |
1:35 (21%)1:35 (66%) | view |
| 32 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto empty.protostruct.proto |
1:35 (66%)1:35 (36%) | view |
| 32 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto any.protostruct.proto |
1:35 (21%)1:35 (36%) | view |
| 32 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto any.prototimestamp.proto |
1:35 (21%)1:35 (24%) | view |
| 32 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto empty.prototimestamp.proto |
1:35 (66%)1:35 (24%) | view |
| 31 | x 2 | packages/app-checkpackages/installations-compat | rollup.config.jsrollup.config.js |
35:75 (77%)27:67 (93%) | view |
| 31 | x 2 | packages/app-check-compatpackages/installations-compat | rollup.config.jsrollup.config.js |
35:75 (77%)27:67 (93%) | view |
| 29 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto timestamp.protowrappers.proto |
1:29 (22%)1:29 (26%) | view |
| 29 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto descriptor.protoempty.proto |
1:29 (3%)1:29 (60%) | view |
| 29 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto empty.protowrappers.proto |
1:29 (60%)1:29 (26%) | view |
| 29 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto descriptor.protowrappers.proto |
1:29 (3%)1:29 (26%) | view |
| 29 | x 2 | packages/firestore/src/protos/google/protobufpackages/firestore/src/protos/google/protobuf | proto descriptor.prototimestamp.proto |
1:29 (3%)1:29 (22%) | view |
Duplicated Units
The list of top 17 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 16 | x 2 | packages/firestorepackages/firestore | rollup.config.lite.jsrollup.config.js |
50:66 53:69 | view |
| 16 | x 2 | packages/database/src/apipackages/database/src/api | Reference_impl.tsReference_impl.ts |
1207:1223 1336:1352 | view |
| 13 | x 2 | packages/database/src/apipackages/database/src/api | Reference_impl.tsReference_impl.ts |
1084:1097 1585:1598 | view |
| 11 | x 2 | packages/analytics/srcpackages/remote-config/src/client | get-config.tsretrying_client.ts |
288:302 68:82 | view |
| 10 | x 2 | packages/messaging/src/internalspackages/installations/src/helpers | idb-manager.tsidb-manager.ts |
30:44 29:44 | view |
| 10 | x 2 | packages/installations/src/helperspackages/messaging/src/internals | idb-manager.tsidb-manager.ts |
29:44 30:44 | view |
| 9 | x 2 | packages/firestorepackages/storage | rollup.shared.jsrollup.config.js |
65:74 27:36 | view |
| 9 | x 2 | packages/firestore/src/remotepackages/firestore/src/remote | persistent_stream.tspersistent_stream.ts |
627:636 771:780 | view |
| 8 | x 2 | packages/analytics/srcpackages/analytics/src | api.tsapi.ts |
510:518 655:663 | view |
| 8 | x 2 | packages/database/src/corepackages/database/src/core | SyncPoint.tsSyncTree.ts |
67:75 76:84 | view |
| 7 | x 2 | packages/firestore/src/localpackages/firestore/src/local | memory_persistence.tsindexeddb_lru_delegate_impl.ts |
376:383 64:71 | view |
| 7 | x 2 | packages/firestore-compat/srcpackages/firestore-compat/src | index.rn.tsindex.node.ts |
30:37 31:38 | view |
| 6 | x 2 | scripts/buildrepo-scripts/prune-dts | create-overloads.tsprune-dts.ts |
198:204 516:522 | view |
| 6 | x 2 | packages/firestore/src/remotepackages/firestore/src/remote | serializer.tsserializer.ts |
1137:1143 1153:1159 | view |
| 6 | x 2 | packages/auth/src/platform_cordova/strategiespackages/auth/src/platform_browser/strategies | redirect.tsredirect.ts |
30:36 79:85 | view |
| 6 | x 2 | packages/auth/src/platform_cordova/strategiespackages/auth/src/platform_browser/strategies | redirect.tsredirect.ts |
46:52 188:194 | view |
| 6 | x 2 | packages/analytics/srcpackages/analytics/src | api.tsapi.ts |
386:392 593:599 | view |