From dd969477e8cb10a4402eccc051a1d1206853e3b0 Mon Sep 17 00:00:00 2001
From: "renovate[bot]" <29139614+renovate[bot]@users.noreply.github.com>
Date: Mon, 8 Dec 2025 22:43:04 -0700
Subject: [PATCH 1/3] chore(deps): update dependency cspell to v9.4.0 (#11831)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
---
 yarn.lock | 355 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 182 insertions(+), 173 deletions(-)

diff --git a/yarn.lock b/yarn.lock
index 275b03e3429..eff9f91cd8b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1587,21 +1587,21 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@cspell/cspell-bundled-dicts@npm:9.3.1":
-  version: 9.3.1
-  resolution: "@cspell/cspell-bundled-dicts@npm:9.3.1"
+"@cspell/cspell-bundled-dicts@npm:9.4.0":
+  version: 9.4.0
+  resolution: "@cspell/cspell-bundled-dicts@npm:9.4.0"
   dependencies:
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     "@cspell/dict-al": ^1.1.1
-    "@cspell/dict-aws": ^4.0.15
+    "@cspell/dict-aws": ^4.0.16
     "@cspell/dict-bash": ^4.2.2
     "@cspell/dict-companies": ^3.2.7
-    "@cspell/dict-cpp": ^6.0.14
+    "@cspell/dict-cpp": ^6.0.15
     "@cspell/dict-cryptocurrencies": ^5.0.5
     "@cspell/dict-csharp": ^4.0.7
     "@cspell/dict-css": ^4.0.18
     "@cspell/dict-dart": ^2.3.1
-    "@cspell/dict-data-science": ^2.0.11
+    "@cspell/dict-data-science": ^2.0.12
     "@cspell/dict-django": ^4.1.5
     "@cspell/dict-docker": ^1.1.16
     "@cspell/dict-dotnet": ^5.0.10
@@ -1619,7 +1619,7 @@ __metadata:
     "@cspell/dict-golang": ^6.0.24
     "@cspell/dict-google": ^1.0.9
     "@cspell/dict-haskell": ^4.0.6
-    "@cspell/dict-html": ^4.0.12
+    "@cspell/dict-html": ^4.0.13
     "@cspell/dict-html-symbol-entities": ^4.0.4
     "@cspell/dict-java": ^5.0.12
     "@cspell/dict-julia": ^1.1.1
@@ -1629,66 +1629,67 @@ __metadata:
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     "@cspell/dict-lua": ^4.0.8
     "@cspell/dict-makefile": ^1.0.5
-    "@cspell/dict-markdown": ^2.0.12
+    "@cspell/dict-markdown": ^2.0.13
     "@cspell/dict-monkeyc": ^1.0.11
     "@cspell/dict-node": ^5.0.8
-    "@cspell/dict-npm": ^5.2.20
+    "@cspell/dict-npm": ^5.2.25
     "@cspell/dict-php": ^4.1.0
     "@cspell/dict-powershell": ^5.0.15
     "@cspell/dict-public-licenses": ^2.0.15
-    "@cspell/dict-python": ^4.2.21
+    "@cspell/dict-python": ^4.2.23
     "@cspell/dict-r": ^2.1.1
     "@cspell/dict-ruby": ^5.0.9
     "@cspell/dict-rust": ^4.0.12
     "@cspell/dict-scala": ^5.0.8
     "@cspell/dict-shell": ^1.1.2
-    "@cspell/dict-software-terms": ^5.1.11
+    "@cspell/dict-software-terms": ^5.1.15
     "@cspell/dict-sql": ^2.2.1
     "@cspell/dict-svelte": ^1.0.7
     "@cspell/dict-swift": ^2.0.6
     "@cspell/dict-terraform": ^1.1.3
     "@cspell/dict-typescript": ^3.2.3
     "@cspell/dict-vue": ^3.0.5
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+    "@cspell/dict-zig": ^1.0.0
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-  resolution: "@cspell/cspell-json-reporter@npm:9.3.1"
+"@cspell/cspell-json-reporter@npm:9.4.0":
+  version: 9.4.0
+  resolution: "@cspell/cspell-json-reporter@npm:9.4.0"
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-  resolution: "@cspell/cspell-resolver@npm:9.3.1"
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+  version: 9.4.0
+  resolution: "@cspell/cspell-resolver@npm:9.4.0"
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+  resolution: "@cspell/dict-cpp@npm:6.0.15"
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-  resolution: "@cspell/dict-data-science@npm:2.0.11"
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+"@cspell/dict-data-science@npm:^2.0.12":
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+  resolution: "@cspell/dict-data-science@npm:2.0.12"
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-"@cspell/dict-html@npm:^4.0.12":
-  version: 4.0.12
-  resolution: "@cspell/dict-html@npm:4.0.12"
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+"@cspell/dict-html@npm:^4.0.13":
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-"@cspell/dict-markdown@npm:^2.0.12":
-  version: 2.0.12
-  resolution: "@cspell/dict-markdown@npm:2.0.12"
+"@cspell/dict-markdown@npm:^2.0.13":
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+  resolution: "@cspell/dict-markdown@npm:2.0.13"
   peerDependencies:
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+"@cspell/dict-python@npm:^4.2.23":
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+  resolution: "@cspell/dict-python@npm:4.2.23"
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+"@cspell/dict-zig@npm:^1.0.0":
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+"@cspell/filetypes@npm:9.4.0":
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+"ansi-regex@npm:^6.0.1, ansi-regex@npm:^6.2.2":
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+  resolution: "ansi-regex@npm:6.2.2"
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-"cspell-config-lib@npm:9.3.1":
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-  resolution: "cspell-config-lib@npm:9.3.1"
+"cspell-config-lib@npm:9.4.0":
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+  resolution: "cspell-config-lib@npm:9.4.0"
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-  resolution: "cspell-dictionary@npm:9.3.1"
+"cspell-dictionary@npm:9.4.0":
+  version: 9.4.0
+  resolution: "cspell-dictionary@npm:9.4.0"
   dependencies:
-    "@cspell/cspell-pipe": 9.3.1
-    "@cspell/cspell-types": 9.3.1
-    cspell-trie-lib: 9.3.1
-    fast-equals: ^5.3.2
-  checksum: fee04e844dd287d80748990027f60b59f460f4854fbb497ea59e9f0cfb64836c3fe274f4fc57d6ba7cf7108e4ff8a8a33740c841d145bb0d220d80868932a943
+    "@cspell/cspell-pipe": 9.4.0
+    "@cspell/cspell-types": 9.4.0
+    cspell-trie-lib: 9.4.0
+    fast-equals: ^5.3.3
+  checksum: a627a821bafd08d8deda44ad33aae363a06b6395e99addec86a95fc0e9b2d00a32e748ec8b329994ade8c49ae05c4deefc168007690246e6cc3eeda941ef518b
   languageName: node
   linkType: hard
 
-"cspell-gitignore@npm:9.3.1":
-  version: 9.3.1
-  resolution: "cspell-gitignore@npm:9.3.1"
+"cspell-gitignore@npm:9.4.0":
+  version: 9.4.0
+  resolution: "cspell-gitignore@npm:9.4.0"
   dependencies:
-    "@cspell/url": 9.3.1
-    cspell-glob: 9.3.1
-    cspell-io: 9.3.1
+    "@cspell/url": 9.4.0
+    cspell-glob: 9.4.0
+    cspell-io: 9.4.0
   bin:
     cspell-gitignore: bin.mjs
-  checksum: 4416034bc854cbfdadb7abd635a7405285ec610a5b4904529f60507d21bb3bb013b9bc29e58ff1ef4a772187b742c550dd9781627f42031291a8b4f1f326d6d0
+  checksum: ac495c8985ef4792f2cbc898ff3a0651f26c96a9238dafb232172551859ca8238987ae93c94d7b7f44145fa8d86799bedd9cbec1c2fecc246e8242371e2ca3c9
   languageName: node
   linkType: hard
 
-"cspell-glob@npm:9.3.1":
-  version: 9.3.1
-  resolution: "cspell-glob@npm:9.3.1"
+"cspell-glob@npm:9.4.0":
+  version: 9.4.0
+  resolution: "cspell-glob@npm:9.4.0"
   dependencies:
-    "@cspell/url": 9.3.1
+    "@cspell/url": 9.4.0
     picomatch: ^4.0.3
-  checksum: 1feaf198b6680b0b8a58e8ae65063cd72d42774f86c6cff905950df52d6474cf50b5c984655b18b60f9ff4693369b9e195bf2b53c3479d337496b2c9433d5649
+  checksum: ee7511179bfb9695a2355d6d24d8956f2db6b68942c965d2bc73a7aaa248424820d6777b76dd2bfcab06e96ea682475d2fa16622322ecb4478403215c2a1a207
   languageName: node
   linkType: hard
 
-"cspell-grammar@npm:9.3.1":
-  version: 9.3.1
-  resolution: "cspell-grammar@npm:9.3.1"
+"cspell-grammar@npm:9.4.0":
+  version: 9.4.0
+  resolution: "cspell-grammar@npm:9.4.0"
   dependencies:
-    "@cspell/cspell-pipe": 9.3.1
-    "@cspell/cspell-types": 9.3.1
+    "@cspell/cspell-pipe": 9.4.0
+    "@cspell/cspell-types": 9.4.0
   bin:
     cspell-grammar: bin.mjs
-  checksum: 1ec40070f972fe634acfec4b84a4b666b92f311ac66ca9ca060eb3f9254e78e03ba33c1b150f77b6555511d5956854f662cebcaf1c1dc24c784d4597e4d10a7d
+  checksum: 38906ce6ae9a448fe1e3207652dce1f902addfee942116fb720def35e9596524407d6370e1a945e4c02f1ff4c7633955b1bd533ebaef2f826e4c82593b0b9c5a
   languageName: node
   linkType: hard
 
-"cspell-io@npm:9.3.1":
-  version: 9.3.1
-  resolution: "cspell-io@npm:9.3.1"
+"cspell-io@npm:9.4.0":
+  version: 9.4.0
+  resolution: "cspell-io@npm:9.4.0"
   dependencies:
-    "@cspell/cspell-service-bus": 9.3.1
-    "@cspell/url": 9.3.1
-  checksum: fe5cf7b7e89a324813f83a611947830ee1ce8cabfe501c63252a43963f5c352d23f2089d7df8ce15b66bb4f74d33931e5795a387e8ecb0043cff5d0e6f092b72
+    "@cspell/cspell-service-bus": 9.4.0
+    "@cspell/url": 9.4.0
+  checksum: 242947ab711dbd2dbd97d6f8d2932e92a09365fbd6002c7a890a1d08ed0a9be68a08c60bbcb67948f1e7d47de82b1631ffed3fa7171661744efb65af31fd10e8
   languageName: node
   linkType: hard
 
-"cspell-lib@npm:9.3.1":
-  version: 9.3.1
-  resolution: "cspell-lib@npm:9.3.1"
-  dependencies:
-    "@cspell/cspell-bundled-dicts": 9.3.1
-    "@cspell/cspell-pipe": 9.3.1
-    "@cspell/cspell-resolver": 9.3.1
-    "@cspell/cspell-types": 9.3.1
-    "@cspell/dynamic-import": 9.3.1
-    "@cspell/filetypes": 9.3.1
-    "@cspell/strong-weak-map": 9.3.1
-    "@cspell/url": 9.3.1
+"cspell-lib@npm:9.4.0":
+  version: 9.4.0
+  resolution: "cspell-lib@npm:9.4.0"
+  dependencies:
+    "@cspell/cspell-bundled-dicts": 9.4.0
+    "@cspell/cspell-pipe": 9.4.0
+    "@cspell/cspell-resolver": 9.4.0
+    "@cspell/cspell-types": 9.4.0
+    "@cspell/dynamic-import": 9.4.0
+    "@cspell/filetypes": 9.4.0
+    "@cspell/strong-weak-map": 9.4.0
+    "@cspell/url": 9.4.0
     clear-module: ^4.1.2
-    cspell-config-lib: 9.3.1
-    cspell-dictionary: 9.3.1
-    cspell-glob: 9.3.1
-    cspell-grammar: 9.3.1
-    cspell-io: 9.3.1
-    cspell-trie-lib: 9.3.1
+    cspell-config-lib: 9.4.0
+    cspell-dictionary: 9.4.0
+    cspell-glob: 9.4.0
+    cspell-grammar: 9.4.0
+    cspell-io: 9.4.0
+    cspell-trie-lib: 9.4.0
     env-paths: ^3.0.0
     gensequence: ^8.0.8
     import-fresh: ^3.3.1
@@ -8866,39 +8874,40 @@ __metadata:
     vscode-languageserver-textdocument: ^1.0.12
     vscode-uri: ^3.1.0
     xdg-basedir: ^5.1.0
-  checksum: 65319dbd5e78305a51b0adf4122b99866516fc30ff8134f45def3c445627fc48e6b0945668dca735d05fba531b2e09ba0c90b94a6dae92750576ae0e5a5ae092
+  checksum: e6aca50548582022bec9c09ac936e58ca4dcc1b445496432cfce2b3fab1d173eaf7733adb041a63b2950da0aa84d0c14474e788f5209c9270d247e41059dd065
   languageName: node
   linkType: hard
 
-"cspell-trie-lib@npm:9.3.1":
-  version: 9.3.1
-  resolution: "cspell-trie-lib@npm:9.3.1"
+"cspell-trie-lib@npm:9.4.0":
+  version: 9.4.0
+  resolution: "cspell-trie-lib@npm:9.4.0"
   dependencies:
-    "@cspell/cspell-pipe": 9.3.1
-    "@cspell/cspell-types": 9.3.1
+    "@cspell/cspell-pipe": 9.4.0
+    "@cspell/cspell-types": 9.4.0
     gensequence: ^8.0.8
-  checksum: 4fa4ed8cdb7245794d3299cab5e2ec541e55efe84e10aef876f67c3eba7f8bba037c690b5345e17d46e21c4b89f0fa57ac8ee43278d5961fa790bb56250a8842
+  checksum: 4a3e00c836701d3fb9268ac6479e45d8799b0629539001c2e3583344a76402eecb3e4592c2e63c768c78de485247a4e1eb0357d2a02edb9846a35214edca3d16
   languageName: node
   linkType: hard
 
 "cspell@npm:^9.0.0":
-  version: 9.3.1
-  resolution: "cspell@npm:9.3.1"
-  dependencies:
-    "@cspell/cspell-json-reporter": 9.3.1
-    "@cspell/cspell-pipe": 9.3.1
-    "@cspell/cspell-types": 9.3.1
-    "@cspell/dynamic-import": 9.3.1
-    "@cspell/url": 9.3.1
+  version: 9.4.0
+  resolution: "cspell@npm:9.4.0"
+  dependencies:
+    "@cspell/cspell-json-reporter": 9.4.0
+    "@cspell/cspell-pipe": 9.4.0
+    "@cspell/cspell-types": 9.4.0
+    "@cspell/dynamic-import": 9.4.0
+    "@cspell/url": 9.4.0
+    ansi-regex: ^6.2.2
     chalk: ^5.6.2
     chalk-template: ^1.1.2
     commander: ^14.0.2
-    cspell-config-lib: 9.3.1
-    cspell-dictionary: 9.3.1
-    cspell-gitignore: 9.3.1
-    cspell-glob: 9.3.1
-    cspell-io: 9.3.1
-    cspell-lib: 9.3.1
+    cspell-config-lib: 9.4.0
+    cspell-dictionary: 9.4.0
+    cspell-gitignore: 9.4.0
+    cspell-glob: 9.4.0
+    cspell-io: 9.4.0
+    cspell-lib: 9.4.0
     fast-json-stable-stringify: ^2.1.0
     flatted: ^3.3.3
     semver: ^7.7.3
@@ -8906,7 +8915,7 @@ __metadata:
   bin:
     cspell: bin.mjs
     cspell-esm: bin.mjs
-  checksum: f24dbcfd66bcd3d09d95c0db9fdd94d0f9d27911d583053dc9fa1f06454d88c790e52d1865f7cf6f8e6873e773fed23cf680942b78b18ca4fd90a2ace3da5703
+  checksum: b7b736ed8f8db80f489a4f8b8f9ea7c179f3d7b07d4512976a05807e9f422f544e86a91f6819a80f8b9d0e43918361392b012774c2d24506bae785759a58d3fc
   languageName: node
   linkType: hard
 
@@ -10900,7 +10909,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"fast-equals@npm:^5.3.2":
+"fast-equals@npm:^5.3.3":
   version: 5.3.3
   resolution: "fast-equals@npm:5.3.3"
   checksum: 52f9e48d12185abe112d54653b8a410845560db2f05fd2140e4f993f47283c060b9ec63eab72c254091bb601103b081912b6a6385e882c09fd686806bd2bf476
@@ -18842,7 +18851,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"smol-toml@npm:^1.4.2, smol-toml@npm:^1.5.2, smol-toml@npm:~1.5.2":
+"smol-toml@npm:^1.5.2, smol-toml@npm:~1.5.2":
   version: 1.5.2
   resolution: "smol-toml@npm:1.5.2"
   checksum: 75b7e8482151cbe48be094de205631502d5694c2a7d968446799e8b988b4105bd6efd3b6a986baa40d9e9b47cbb2daada21a302901a618793aabd35a670f195e
@@ -21283,12 +21292,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"yaml@npm:^2.6.0, yaml@npm:^2.7.0, yaml@npm:^2.7.1, yaml@npm:^2.8.1":
-  version: 2.8.1
-  resolution: "yaml@npm:2.8.1"
+"yaml@npm:^2.6.0, yaml@npm:^2.7.0, yaml@npm:^2.7.1, yaml@npm:^2.8.2":
+  version: 2.8.2
+  resolution: "yaml@npm:2.8.2"
   bin:
     yaml: bin.mjs
-  checksum: 35b46150d48bc1da2fd5b1521a48a4fa36d68deaabe496f3c3fa9646d5796b6b974f3930a02c4b5aee6c85c860d7d7f79009416724465e835f40b87898c36de4
+  checksum: 5ffd9f23bc7a450129cbd49dcf91418988f154ede10c83fd28ab293661ac2783c05da19a28d76a22cbd77828eae25d4bd7453f9a9fe2d287d085d72db46fd105
   languageName: node
   linkType: hard
 

From 5bd78cab52569a5e9e14a8e4588a672ca933a0be Mon Sep 17 00:00:00 2001
From: "renovate[bot]" <29139614+renovate[bot]@users.noreply.github.com>
Date: Fri, 12 Dec 2025 10:30:40 -0700
Subject: [PATCH 2/3] chore(deps): update dependency console-fail-test to
 ^0.6.0 (#11841)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
---
 package.json |  2 +-
 yarn.lock    | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/package.json b/package.json
index 7fe68c15c5f..ee353f13d27 100644
--- a/package.json
+++ b/package.json
@@ -76,7 +76,7 @@
     "@typescript-eslint/utils": "workspace:^",
     "@vitest/coverage-v8": "^3.1.3",
     "@vitest/eslint-plugin": "1.5.1",
-    "console-fail-test": "^0.5.0",
+    "console-fail-test": "^0.6.0",
     "cross-fetch": "^4.0.0",
     "cspell": "^9.0.0",
     "eslint": "^9.26.0",
diff --git a/yarn.lock b/yarn.lock
index eff9f91cd8b..47039b5e7d9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6376,7 +6376,7 @@ __metadata:
     "@typescript-eslint/utils": "workspace:^"
     "@vitest/coverage-v8": ^3.1.3
     "@vitest/eslint-plugin": 1.5.1
-    console-fail-test: ^0.5.0
+    console-fail-test: ^0.6.0
     cross-fetch: ^4.0.0
     cspell: ^9.0.0
     eslint: ^9.26.0
@@ -8564,10 +8564,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"console-fail-test@npm:^0.5.0":
-  version: 0.5.0
-  resolution: "console-fail-test@npm:0.5.0"
-  checksum: 61ccd9f6c034dbbba8acb0dcfe8c9dec1e5c6da69e1f365786468065a209fc1ee4acca70048e48d6149d5f0e89ae3c835c0b4c2698300f334614f65029c63484
+"console-fail-test@npm:^0.6.0":
+  version: 0.6.1
+  resolution: "console-fail-test@npm:0.6.1"
+  checksum: 6e0e30d95d195b234e927a6b9c92a8e8346fb2e4eaccd9dacc2fde54ce0f82f2ad483f7585a4deefb7b101ded3dbcc7eb36c3584c4541ff7fa39941d6a93a470
   languageName: node
   linkType: hard
 

From 1301f79e54241c1760ef88a76a757bc498d9a840 Mon Sep 17 00:00:00 2001
From: Ulrich Stark <github@ustark.de>
Date: Sun, 14 Dec 2025 15:43:10 +0100
Subject: [PATCH 3/3] feat(eslint-plugin): [no-useless-default-assignment] add
 rule (#11720)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* feat(eslint-plugin): [no-useless-default-assignment] add rule

* support function parameters without type annotation

* fix false positives

* fixing more false positives

* enable rule in repo to dogfood

* cleanup code and increase code coverage

* cleanup code and add column numbers to tests

* add tests to increase test coverage

* remove option allowRuleToRunWithoutStrictNullChecksIKnowWhatIAmDoing

* remove comments at each test case

* remove rule from rulesWithComplexOptionHeadings

* update snapshot

* Update packages/eslint-plugin/docs/rules/no-useless-default-assignment.mdx

Co-authored-by: Josh Goldberg ✨ <git@joshuakgoldberg.com>

* Update packages/eslint-plugin/docs/rules/no-useless-default-assignment.mdx

Co-authored-by: Josh Goldberg ✨ <git@joshuakgoldberg.com>

* add rule to strict config

* turn suggestion into fix

* add more test cases and make them pass

* make example code easier to understand and add tuple example

* increase test coverage

* remove self-apparent comments

* use createRuleTesterWithTypes

* use isFunction

* remove unnecessary schema item

* update snapshot

* support nested destructuring

* add valid test case

* report contextual assignments and more test cases

* report undefined as useless default assignment

* add test cases, refactor and use nullThrows to increase test coverage

* remove from eslint.config.mjs

* make "when not to use it" more relevant to this rule

* remove unnecessary type assertion

* check for string index type

* support compiler option noUncheckedIndexedAccess properly

* also support noUncheckedIndexedAccess for records/mapped types

---------

Co-authored-by: Josh Goldberg ✨ <git@joshuakgoldberg.com>
---
 .../rules/no-useless-default-assignment.mdx   |  53 ++
 .../eslint-plugin/src/configs/eslintrc/all.ts |   1 +
 .../configs/eslintrc/disable-type-checked.ts  |   1 +
 .../eslintrc/strict-type-checked-only.ts      |   1 +
 .../configs/eslintrc/strict-type-checked.ts   |   1 +
 .../eslint-plugin/src/configs/flat/all.ts     |   1 +
 .../src/configs/flat/disable-type-checked.ts  |   1 +
 .../configs/flat/strict-type-checked-only.ts  |   1 +
 .../src/configs/flat/strict-type-checked.ts   |   1 +
 packages/eslint-plugin/src/rules/index.ts     |   2 +
 .../rules/no-useless-default-assignment.ts    | 263 +++++++++
 .../no-useless-default-assignment.shot        |  27 +
 .../no-useless-default-assignment.test.ts     | 520 ++++++++++++++++++
 .../no-useless-default-assignment.shot        |  10 +
 14 files changed, 883 insertions(+)
 create mode 100644 packages/eslint-plugin/docs/rules/no-useless-default-assignment.mdx
 create mode 100644 packages/eslint-plugin/src/rules/no-useless-default-assignment.ts
 create mode 100644 packages/eslint-plugin/tests/docs-eslint-output-snapshots/no-useless-default-assignment.shot
 create mode 100644 packages/eslint-plugin/tests/rules/no-useless-default-assignment.test.ts
 create mode 100644 packages/eslint-plugin/tests/schema-snapshots/no-useless-default-assignment.shot

diff --git a/packages/eslint-plugin/docs/rules/no-useless-default-assignment.mdx b/packages/eslint-plugin/docs/rules/no-useless-default-assignment.mdx
new file mode 100644
index 00000000000..258e9b5b812
--- /dev/null
+++ b/packages/eslint-plugin/docs/rules/no-useless-default-assignment.mdx
@@ -0,0 +1,53 @@
+---
+description: 'Disallow default values that will never be used.'
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+> 🛑 This file is source code, not the primary documentation location! 🛑
+>
+> See **https://typescript-eslint.io/rules/no-useless-default-assignment** for documentation.
+
+[Default parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters) and [default values](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#default_value) are only used if the parameter or property is `undefined`.
+That can happen when a value is missing, or when one is provided and set to `undefined`.
+If a non-`undefined` value is guaranteed to be provided, then there is no need to define a default.
+
+## Examples
+
+<Tabs>
+<TabItem value="❌ Incorrect">
+
+```ts
+function Bar({ foo = '' }: { foo: string }) {
+  return foo;
+}
+
+const { foo = '' } = { foo: 'bar' };
+
+const [foo = ''] = ['bar'];
+
+[1, 2, 3].map((a = 42) => a + 1);
+```
+
+</TabItem>
+<TabItem value="✅ Correct">
+
+```ts
+function Bar({ foo = '' }: { foo?: string }) {
+  return foo;
+}
+
+const { foo = '' } = { foo: undefined };
+
+const [foo = ''] = [undefined];
+
+[1, 2, 3, undefined].map((a = 42) => a + 1);
+```
+
+</TabItem>
+</Tabs>
+
+## When Not To Use It
+
+If you use default values defensively against runtime values that bypass type checking, or for documentation purposes, you may want to disable this rule.
diff --git a/packages/eslint-plugin/src/configs/eslintrc/all.ts b/packages/eslint-plugin/src/configs/eslintrc/all.ts
index 78c8420e264..11221a74807 100644
--- a/packages/eslint-plugin/src/configs/eslintrc/all.ts
+++ b/packages/eslint-plugin/src/configs/eslintrc/all.ts
@@ -120,6 +120,7 @@ export = {
     '@typescript-eslint/no-use-before-define': 'error',
     'no-useless-constructor': 'off',
     '@typescript-eslint/no-useless-constructor': 'error',
+    '@typescript-eslint/no-useless-default-assignment': 'error',
     '@typescript-eslint/no-useless-empty-export': 'error',
     '@typescript-eslint/no-wrapper-object-types': 'error',
     '@typescript-eslint/non-nullable-type-assertion-style': 'error',
diff --git a/packages/eslint-plugin/src/configs/eslintrc/disable-type-checked.ts b/packages/eslint-plugin/src/configs/eslintrc/disable-type-checked.ts
index 6853a151722..277f99228c1 100644
--- a/packages/eslint-plugin/src/configs/eslintrc/disable-type-checked.ts
+++ b/packages/eslint-plugin/src/configs/eslintrc/disable-type-checked.ts
@@ -44,6 +44,7 @@ export = {
     '@typescript-eslint/no-unsafe-return': 'off',
     '@typescript-eslint/no-unsafe-type-assertion': 'off',
     '@typescript-eslint/no-unsafe-unary-minus': 'off',
+    '@typescript-eslint/no-useless-default-assignment': 'off',
     '@typescript-eslint/non-nullable-type-assertion-style': 'off',
     '@typescript-eslint/only-throw-error': 'off',
     '@typescript-eslint/prefer-destructuring': 'off',
diff --git a/packages/eslint-plugin/src/configs/eslintrc/strict-type-checked-only.ts b/packages/eslint-plugin/src/configs/eslintrc/strict-type-checked-only.ts
index a2b5b457d01..c455ac88371 100644
--- a/packages/eslint-plugin/src/configs/eslintrc/strict-type-checked-only.ts
+++ b/packages/eslint-plugin/src/configs/eslintrc/strict-type-checked-only.ts
@@ -39,6 +39,7 @@ export = {
     '@typescript-eslint/no-unsafe-member-access': 'error',
     '@typescript-eslint/no-unsafe-return': 'error',
     '@typescript-eslint/no-unsafe-unary-minus': 'error',
+    '@typescript-eslint/no-useless-default-assignment': 'error',
     'no-throw-literal': 'off',
     '@typescript-eslint/only-throw-error': 'error',
     'prefer-promise-reject-errors': 'off',
diff --git a/packages/eslint-plugin/src/configs/eslintrc/strict-type-checked.ts b/packages/eslint-plugin/src/configs/eslintrc/strict-type-checked.ts
index ec1523d8b48..aba8c3006a1 100644
--- a/packages/eslint-plugin/src/configs/eslintrc/strict-type-checked.ts
+++ b/packages/eslint-plugin/src/configs/eslintrc/strict-type-checked.ts
@@ -68,6 +68,7 @@ export = {
     '@typescript-eslint/no-unused-vars': 'error',
     'no-useless-constructor': 'off',
     '@typescript-eslint/no-useless-constructor': 'error',
+    '@typescript-eslint/no-useless-default-assignment': 'error',
     '@typescript-eslint/no-wrapper-object-types': 'error',
     'no-throw-literal': 'off',
     '@typescript-eslint/only-throw-error': 'error',
diff --git a/packages/eslint-plugin/src/configs/flat/all.ts b/packages/eslint-plugin/src/configs/flat/all.ts
index 43792419ab3..7e61ed948ab 100644
--- a/packages/eslint-plugin/src/configs/flat/all.ts
+++ b/packages/eslint-plugin/src/configs/flat/all.ts
@@ -134,6 +134,7 @@ export default (
       '@typescript-eslint/no-use-before-define': 'error',
       'no-useless-constructor': 'off',
       '@typescript-eslint/no-useless-constructor': 'error',
+      '@typescript-eslint/no-useless-default-assignment': 'error',
       '@typescript-eslint/no-useless-empty-export': 'error',
       '@typescript-eslint/no-wrapper-object-types': 'error',
       '@typescript-eslint/non-nullable-type-assertion-style': 'error',
diff --git a/packages/eslint-plugin/src/configs/flat/disable-type-checked.ts b/packages/eslint-plugin/src/configs/flat/disable-type-checked.ts
index 5a48e172277..7603dde91c7 100644
--- a/packages/eslint-plugin/src/configs/flat/disable-type-checked.ts
+++ b/packages/eslint-plugin/src/configs/flat/disable-type-checked.ts
@@ -51,6 +51,7 @@ export default (
     '@typescript-eslint/no-unsafe-return': 'off',
     '@typescript-eslint/no-unsafe-type-assertion': 'off',
     '@typescript-eslint/no-unsafe-unary-minus': 'off',
+    '@typescript-eslint/no-useless-default-assignment': 'off',
     '@typescript-eslint/non-nullable-type-assertion-style': 'off',
     '@typescript-eslint/only-throw-error': 'off',
     '@typescript-eslint/prefer-destructuring': 'off',
diff --git a/packages/eslint-plugin/src/configs/flat/strict-type-checked-only.ts b/packages/eslint-plugin/src/configs/flat/strict-type-checked-only.ts
index 043f1aad0cd..2cddf49a463 100644
--- a/packages/eslint-plugin/src/configs/flat/strict-type-checked-only.ts
+++ b/packages/eslint-plugin/src/configs/flat/strict-type-checked-only.ts
@@ -52,6 +52,7 @@ export default (
       '@typescript-eslint/no-unsafe-member-access': 'error',
       '@typescript-eslint/no-unsafe-return': 'error',
       '@typescript-eslint/no-unsafe-unary-minus': 'error',
+      '@typescript-eslint/no-useless-default-assignment': 'error',
       'no-throw-literal': 'off',
       '@typescript-eslint/only-throw-error': 'error',
       'prefer-promise-reject-errors': 'off',
diff --git a/packages/eslint-plugin/src/configs/flat/strict-type-checked.ts b/packages/eslint-plugin/src/configs/flat/strict-type-checked.ts
index b3c0a239117..4d34eb4925d 100644
--- a/packages/eslint-plugin/src/configs/flat/strict-type-checked.ts
+++ b/packages/eslint-plugin/src/configs/flat/strict-type-checked.ts
@@ -81,6 +81,7 @@ export default (
       '@typescript-eslint/no-unused-vars': 'error',
       'no-useless-constructor': 'off',
       '@typescript-eslint/no-useless-constructor': 'error',
+      '@typescript-eslint/no-useless-default-assignment': 'error',
       '@typescript-eslint/no-wrapper-object-types': 'error',
       'no-throw-literal': 'off',
       '@typescript-eslint/only-throw-error': 'error',
diff --git a/packages/eslint-plugin/src/rules/index.ts b/packages/eslint-plugin/src/rules/index.ts
index 9ee5903aa5f..c32c3296751 100644
--- a/packages/eslint-plugin/src/rules/index.ts
+++ b/packages/eslint-plugin/src/rules/index.ts
@@ -92,6 +92,7 @@ import noUnusedPrivateClassMembers from './no-unused-private-class-members';
 import noUnusedVars from './no-unused-vars';
 import noUseBeforeDefine from './no-use-before-define';
 import noUselessConstructor from './no-useless-constructor';
+import noUselessDefaultAssignment from './no-useless-default-assignment';
 import noUselessEmptyExport from './no-useless-empty-export';
 import noVarRequires from './no-var-requires';
 import noWrapperObjectTypes from './no-wrapper-object-types';
@@ -227,6 +228,7 @@ const rules = {
   'no-unused-vars': noUnusedVars,
   'no-use-before-define': noUseBeforeDefine,
   'no-useless-constructor': noUselessConstructor,
+  'no-useless-default-assignment': noUselessDefaultAssignment,
   'no-useless-empty-export': noUselessEmptyExport,
   'no-var-requires': noVarRequires,
   'no-wrapper-object-types': noWrapperObjectTypes,
diff --git a/packages/eslint-plugin/src/rules/no-useless-default-assignment.ts b/packages/eslint-plugin/src/rules/no-useless-default-assignment.ts
new file mode 100644
index 00000000000..f33631df44a
--- /dev/null
+++ b/packages/eslint-plugin/src/rules/no-useless-default-assignment.ts
@@ -0,0 +1,263 @@
+import type { TSESTree } from '@typescript-eslint/utils';
+
+import { AST_NODE_TYPES } from '@typescript-eslint/utils';
+import * as tsutils from 'ts-api-utils';
+import * as ts from 'typescript';
+
+import {
+  createRule,
+  getParserServices,
+  isFunction,
+  isTypeAnyType,
+  isTypeFlagSet,
+  isTypeUnknownType,
+  nullThrows,
+  NullThrowsReasons,
+} from '../util';
+
+type MessageId = 'uselessDefaultAssignment' | 'uselessUndefined';
+
+export default createRule<[], MessageId>({
+  name: 'no-useless-default-assignment',
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'Disallow default values that will never be used',
+      recommended: 'strict',
+      requiresTypeChecking: true,
+    },
+    fixable: 'code',
+    messages: {
+      uselessDefaultAssignment:
+        'Default value is useless because the {{ type }} is not optional.',
+      uselessUndefined:
+        'Default value is useless because it is undefined. Optional {{ type }}s are already undefined by default.',
+    },
+    schema: [],
+  },
+  defaultOptions: [],
+  create(context) {
+    const services = getParserServices(context);
+    const checker = services.program.getTypeChecker();
+    const compilerOptions = services.program.getCompilerOptions();
+    const isNoUncheckedIndexedAccess = tsutils.isCompilerOptionEnabled(
+      compilerOptions,
+      'noUncheckedIndexedAccess',
+    );
+
+    function canBeUndefined(type: ts.Type): boolean {
+      if (isTypeAnyType(type) || isTypeUnknownType(type)) {
+        return true;
+      }
+      return tsutils
+        .unionConstituents(type)
+        .some(part => isTypeFlagSet(part, ts.TypeFlags.Undefined));
+    }
+
+    function getPropertyType(
+      objectType: ts.Type,
+      propertyName: string,
+    ): ts.Type | null {
+      const symbol = objectType.getProperty(propertyName);
+      if (!symbol) {
+        if (isNoUncheckedIndexedAccess) {
+          return null;
+        }
+        return objectType.getStringIndexType() ?? null;
+      }
+      return checker.getTypeOfSymbol(symbol);
+    }
+
+    function getArrayElementType(
+      arrayType: ts.Type,
+      elementIndex: number,
+    ): ts.Type | null {
+      if (checker.isTupleType(arrayType)) {
+        const tupleArgs = checker.getTypeArguments(arrayType);
+        if (elementIndex < tupleArgs.length) {
+          return tupleArgs[elementIndex];
+        }
+      }
+
+      if (isNoUncheckedIndexedAccess) {
+        return null;
+      }
+
+      return arrayType.getNumberIndexType() ?? null;
+    }
+
+    function checkAssignmentPattern(node: TSESTree.AssignmentPattern): void {
+      if (
+        node.right.type === AST_NODE_TYPES.Identifier &&
+        node.right.name === 'undefined'
+      ) {
+        const type =
+          node.parent.type === AST_NODE_TYPES.Property ||
+          node.parent.type === AST_NODE_TYPES.ArrayPattern
+            ? 'property'
+            : 'parameter';
+        reportUselessDefault(node, type, 'uselessUndefined');
+        return;
+      }
+
+      const parent = node.parent;
+
+      if (
+        parent.type === AST_NODE_TYPES.ArrowFunctionExpression ||
+        parent.type === AST_NODE_TYPES.FunctionExpression
+      ) {
+        const paramIndex = parent.params.indexOf(node);
+        if (paramIndex !== -1) {
+          const tsFunc = services.esTreeNodeToTSNodeMap.get(parent);
+          if (ts.isFunctionLike(tsFunc)) {
+            const contextualType = checker.getContextualType(
+              tsFunc as ts.Expression,
+            );
+            if (!contextualType) {
+              return;
+            }
+
+            const signatures = contextualType.getCallSignatures();
+            const params = signatures[0].getParameters();
+            if (paramIndex < params.length) {
+              const paramSymbol = params[paramIndex];
+              if ((paramSymbol.flags & ts.SymbolFlags.Optional) === 0) {
+                const paramType = checker.getTypeOfSymbol(paramSymbol);
+                if (!canBeUndefined(paramType)) {
+                  reportUselessDefault(
+                    node,
+                    'parameter',
+                    'uselessDefaultAssignment',
+                  );
+                }
+              }
+            }
+          }
+        }
+        return;
+      }
+
+      if (parent.type === AST_NODE_TYPES.Property) {
+        const propertyType = getTypeOfProperty(parent);
+        if (!propertyType) {
+          return;
+        }
+
+        if (!canBeUndefined(propertyType)) {
+          reportUselessDefault(node, 'property', 'uselessDefaultAssignment');
+        }
+      } else if (parent.type === AST_NODE_TYPES.ArrayPattern) {
+        const sourceType = getSourceTypeForPattern(parent);
+        if (!sourceType) {
+          return;
+        }
+
+        const elementIndex = parent.elements.indexOf(node);
+        const elementType = getArrayElementType(sourceType, elementIndex);
+        if (!elementType) {
+          return;
+        }
+
+        if (!canBeUndefined(elementType)) {
+          reportUselessDefault(node, 'property', 'uselessDefaultAssignment');
+        }
+      }
+    }
+
+    function getTypeOfProperty(node: TSESTree.Property): ts.Type | null {
+      const objectPattern = node.parent as TSESTree.ObjectPattern;
+      const sourceType = getSourceTypeForPattern(objectPattern);
+      if (!sourceType) {
+        return null;
+      }
+
+      const propertyName = getPropertyName(node.key);
+      if (!propertyName) {
+        return null;
+      }
+
+      return getPropertyType(sourceType, propertyName);
+    }
+
+    function getSourceTypeForPattern(pattern: TSESTree.Node): ts.Type | null {
+      const parent = nullThrows(
+        pattern.parent,
+        NullThrowsReasons.MissingParent,
+      );
+
+      if (parent.type === AST_NODE_TYPES.VariableDeclarator && parent.init) {
+        const tsNode = services.esTreeNodeToTSNodeMap.get(parent.init);
+        return checker.getTypeAtLocation(tsNode);
+      }
+
+      if (isFunction(parent)) {
+        const paramIndex = parent.params.indexOf(pattern as TSESTree.Parameter);
+        const tsFunc = services.esTreeNodeToTSNodeMap.get(parent);
+        const signature = nullThrows(
+          checker.getSignatureFromDeclaration(tsFunc),
+          NullThrowsReasons.MissingToken('signature', 'function'),
+        );
+        const params = signature.getParameters();
+        return checker.getTypeOfSymbol(params[paramIndex]);
+      }
+
+      if (parent.type === AST_NODE_TYPES.AssignmentPattern) {
+        return getSourceTypeForPattern(parent);
+      }
+
+      if (parent.type === AST_NODE_TYPES.Property) {
+        return getTypeOfProperty(parent);
+      }
+
+      if (parent.type === AST_NODE_TYPES.ArrayPattern) {
+        const arrayPattern = parent;
+        const arrayType = getSourceTypeForPattern(arrayPattern);
+        if (!arrayType) {
+          return null;
+        }
+        const elementIndex = arrayPattern.elements.indexOf(
+          pattern as TSESTree.DestructuringPattern,
+        );
+        return getArrayElementType(arrayType, elementIndex);
+      }
+
+      return null;
+    }
+
+    function getPropertyName(
+      key: TSESTree.Expression | TSESTree.PrivateIdentifier,
+    ): string | null {
+      switch (key.type) {
+        case AST_NODE_TYPES.Identifier:
+          return key.name;
+        case AST_NODE_TYPES.Literal:
+          return String(key.value);
+        default:
+          return null;
+      }
+    }
+
+    function reportUselessDefault(
+      node: TSESTree.AssignmentPattern,
+      type: 'parameter' | 'property',
+      messageId: MessageId,
+    ): void {
+      context.report({
+        node: node.right,
+        messageId,
+        data: { type },
+        fix(fixer) {
+          // Remove from before the = to the end of the default value
+          // Find the start position (including whitespace before =)
+          const start = node.left.range[1];
+          const end = node.range[1];
+          return fixer.removeRange([start, end]);
+        },
+      });
+    }
+
+    return {
+      AssignmentPattern: checkAssignmentPattern,
+    };
+  },
+});
diff --git a/packages/eslint-plugin/tests/docs-eslint-output-snapshots/no-useless-default-assignment.shot b/packages/eslint-plugin/tests/docs-eslint-output-snapshots/no-useless-default-assignment.shot
new file mode 100644
index 00000000000..b63ea9a740f
--- /dev/null
+++ b/packages/eslint-plugin/tests/docs-eslint-output-snapshots/no-useless-default-assignment.shot
@@ -0,0 +1,27 @@
+Incorrect
+
+function Bar({ foo = '' }: { foo: string }) {
+                     ~~ Default value is useless because the property is not optional.
+  return foo;
+}
+
+const { foo = '' } = { foo: 'bar' };
+              ~~ Default value is useless because the property is not optional.
+
+const [foo = ''] = ['bar'];
+             ~~ Default value is useless because the property is not optional.
+
+[1, 2, 3].map((a = 42) => a + 1);
+                   ~~ Default value is useless because the parameter is not optional.
+
+Correct
+
+function Bar({ foo = '' }: { foo?: string }) {
+  return foo;
+}
+
+const { foo = '' } = { foo: undefined };
+
+const [foo = ''] = [undefined];
+
+[1, 2, 3, undefined].map((a = 42) => a + 1);
diff --git a/packages/eslint-plugin/tests/rules/no-useless-default-assignment.test.ts b/packages/eslint-plugin/tests/rules/no-useless-default-assignment.test.ts
new file mode 100644
index 00000000000..d5d52b5bd0d
--- /dev/null
+++ b/packages/eslint-plugin/tests/rules/no-useless-default-assignment.test.ts
@@ -0,0 +1,520 @@
+import rule from '../../src/rules/no-useless-default-assignment';
+import { createRuleTesterWithTypes, getFixturesRootDir } from '../RuleTester';
+
+const rootDir = getFixturesRootDir();
+const ruleTester = createRuleTesterWithTypes();
+
+ruleTester.run('no-useless-default-assignment', rule, {
+  valid: [
+    `
+      function Bar({ foo = '' }: { foo?: string }) {
+        return foo;
+      }
+    `,
+    `
+      const { foo } = { foo: 'bar' };
+    `,
+    `
+      [1, 2, 3, undefined].map((a = 42) => a + 1);
+    `,
+    `
+      function test(a?: number) {
+        return a;
+      }
+    `,
+    `
+      const obj: { a?: string } = {};
+      const { a = 'default' } = obj;
+    `,
+    `
+      function test(a: string | undefined = 'default') {
+        return a;
+      }
+    `,
+    `
+      (a: string = 'default') => a;
+    `,
+    `
+      function test(a: string = 'default') {
+        return a;
+      }
+    `,
+    `
+      class C {
+        public test(a: string = 'default') {
+          return a;
+        }
+      }
+    `,
+    `
+      const obj: { a: string | undefined } = { a: undefined };
+      const { a = 'default' } = obj;
+    `,
+    `
+      function test(arr: number[] | undefined = []) {
+        return arr;
+      }
+    `,
+    `
+      function Bar({ nested: { foo = '' } = {} }: { nested?: { foo?: string } }) {
+        return foo;
+      }
+    `,
+    `
+      function test(a: any = 'default') {
+        return a;
+      }
+    `,
+    `
+      function test(a: unknown = 'default') {
+        return a;
+      }
+    `,
+    `
+      function test(a = 5) {
+        return a;
+      }
+    `,
+    `
+      function createValidator(): () => void {
+        return (param = 5) => {};
+      }
+    `,
+    `
+      function Bar({ foo = '' }: { foo: any }) {
+        return foo;
+      }
+    `,
+    `
+      function Bar({ foo = '' }: { foo: unknown }) {
+        return foo;
+      }
+    `,
+    `
+      function getValue(): undefined;
+      function getValue(box: { value: string }): string;
+      function getValue({ value = '' }: { value?: string } = {}): string | undefined {
+        return value;
+      }
+    `,
+    `
+      function getValueObject({ value = '' }: Partial<{ value: string }>) {
+        return value;
+      }
+    `,
+    `
+      const { value = 'default' } = someUnknownFunction();
+    `,
+    `
+      const [value = 'default'] = someUnknownFunction();
+    `,
+    `
+      for (const { value = 'default' } of []) {
+      }
+    `,
+    `
+      for (const [value = 'default'] of []) {
+      }
+    `,
+    `
+      declare const x: [[number | undefined]];
+      const [[a = 1]] = x;
+    `,
+    `
+      function foo(x: string = '') {}
+    `,
+    `
+      class C {
+        method(x: string = '') {}
+      }
+    `,
+    `
+      const foo = (x: string = '') => {};
+    `,
+    `
+      const obj = { ab: { x: 1 } };
+      const {
+        ['a' + 'b']: { x = 1 },
+      } = obj;
+    `,
+    `
+      const obj = { ab: 1 };
+      const { ['a' + 'b']: x = 1 } = obj;
+    `,
+    `
+      for ([[a = 1]] of []) {
+      }
+    `,
+    {
+      code: `
+        declare const g: Array<string>;
+        const [foo = ''] = g;
+      `,
+      languageOptions: {
+        parserOptions: {
+          project: './tsconfig.noUncheckedIndexedAccess.json',
+          projectService: false,
+          tsconfigRootDir: rootDir,
+        },
+      },
+    },
+    {
+      code: `
+        declare const g: Record<string, string>;
+        const { foo = '' } = g;
+      `,
+      languageOptions: {
+        parserOptions: {
+          project: './tsconfig.noUncheckedIndexedAccess.json',
+          projectService: false,
+          tsconfigRootDir: rootDir,
+        },
+      },
+    },
+    {
+      code: `
+        declare const h: { [key: string]: string };
+        const { bar = '' } = h;
+      `,
+      languageOptions: {
+        parserOptions: {
+          project: './tsconfig.noUncheckedIndexedAccess.json',
+          projectService: false,
+          tsconfigRootDir: rootDir,
+        },
+      },
+    },
+  ],
+  invalid: [
+    {
+      code: `
+        function Bar({ foo = '' }: { foo: string }) {
+          return foo;
+        }
+      `,
+      errors: [
+        {
+          column: 30,
+          data: { type: 'property' },
+          endColumn: 32,
+          line: 2,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        function Bar({ foo }: { foo: string }) {
+          return foo;
+        }
+      `,
+    },
+    {
+      code: `
+        class C {
+          public method({ foo = '' }: { foo: string }) {
+            return foo;
+          }
+        }
+      `,
+      errors: [
+        {
+          column: 33,
+          data: { type: 'property' },
+          endColumn: 35,
+          line: 3,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        class C {
+          public method({ foo }: { foo: string }) {
+            return foo;
+          }
+        }
+      `,
+    },
+    {
+      code: `
+        const { 'literal-key': literalKey = 'default' } = { 'literal-key': 'value' };
+      `,
+      errors: [
+        {
+          column: 45,
+          data: { type: 'property' },
+          endColumn: 54,
+          line: 2,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        const { 'literal-key': literalKey } = { 'literal-key': 'value' };
+      `,
+    },
+    {
+      code: `
+        [1, 2, 3].map((a = 42) => a + 1);
+      `,
+      errors: [
+        {
+          column: 28,
+          data: { type: 'parameter' },
+          endColumn: 30,
+          line: 2,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        [1, 2, 3].map((a) => a + 1);
+      `,
+    },
+    {
+      code: `
+        function getValue(): undefined;
+        function getValue(box: { value: string }): string;
+        function getValue({ value = '' }: { value: string } = {}): string | undefined {
+          return value;
+        }
+      `,
+      errors: [
+        {
+          column: 37,
+          data: { type: 'property' },
+          endColumn: 39,
+          line: 4,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        function getValue(): undefined;
+        function getValue(box: { value: string }): string;
+        function getValue({ value }: { value: string } = {}): string | undefined {
+          return value;
+        }
+      `,
+    },
+    {
+      code: `
+        function getValue([value = '']: [string]) {
+          return value;
+        }
+      `,
+      errors: [
+        {
+          column: 36,
+          data: { type: 'property' },
+          endColumn: 38,
+          line: 2,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        function getValue([value]: [string]) {
+          return value;
+        }
+      `,
+    },
+    {
+      code: `
+        declare const x: { hello: { world: string } };
+
+        const {
+          hello: { world = '' },
+        } = x;
+      `,
+      errors: [
+        {
+          column: 28,
+          data: { type: 'property' },
+          endColumn: 30,
+          line: 5,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        declare const x: { hello: { world: string } };
+
+        const {
+          hello: { world },
+        } = x;
+      `,
+    },
+    {
+      code: `
+        declare const x: { hello: Array<{ world: string }> };
+
+        const {
+          hello: [{ world = '' }],
+        } = x;
+      `,
+      errors: [
+        {
+          column: 29,
+          data: { type: 'property' },
+          endColumn: 31,
+          line: 5,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        declare const x: { hello: Array<{ world: string }> };
+
+        const {
+          hello: [{ world }],
+        } = x;
+      `,
+    },
+    {
+      code: `
+        interface B {
+          foo: (b: boolean | string) => void;
+        }
+
+        const h: B = {
+          foo: (b = false) => {},
+        };
+      `,
+      errors: [
+        {
+          column: 21,
+          data: { type: 'parameter' },
+          endColumn: 26,
+          line: 7,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        interface B {
+          foo: (b: boolean | string) => void;
+        }
+
+        const h: B = {
+          foo: (b) => {},
+        };
+      `,
+    },
+    {
+      code: `
+        function foo(a = undefined) {}
+      `,
+      errors: [
+        {
+          column: 26,
+          data: { type: 'parameter' },
+          endColumn: 35,
+          line: 2,
+          messageId: 'uselessUndefined',
+        },
+      ],
+      output: `
+        function foo(a) {}
+      `,
+    },
+    {
+      code: `
+        const { a = undefined } = {};
+      `,
+      errors: [
+        {
+          column: 21,
+          data: { type: 'property' },
+          endColumn: 30,
+          line: 2,
+          messageId: 'uselessUndefined',
+        },
+      ],
+      output: `
+        const { a } = {};
+      `,
+    },
+    {
+      code: `
+        const [a = undefined] = [];
+      `,
+      errors: [
+        {
+          column: 20,
+          data: { type: 'property' },
+          endColumn: 29,
+          line: 2,
+          messageId: 'uselessUndefined',
+        },
+      ],
+      output: `
+        const [a] = [];
+      `,
+    },
+    {
+      code: `
+        function foo({ a = undefined }) {}
+      `,
+      errors: [
+        {
+          column: 28,
+          data: { type: 'property' },
+          endColumn: 37,
+          line: 2,
+          messageId: 'uselessUndefined',
+        },
+      ],
+      output: `
+        function foo({ a }) {}
+      `,
+    },
+    {
+      code: `
+        declare const g: Record<string, string>;
+        const { hello = '' } = g;
+      `,
+      errors: [
+        {
+          column: 25,
+          data: { type: 'property' },
+          endColumn: 27,
+          line: 3,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        declare const g: Record<string, string>;
+        const { hello } = g;
+      `,
+    },
+    {
+      code: `
+        declare const h: { [key: string]: string };
+        const { world = '' } = h;
+      `,
+      errors: [
+        {
+          column: 25,
+          data: { type: 'property' },
+          endColumn: 27,
+          line: 3,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        declare const h: { [key: string]: string };
+        const { world } = h;
+      `,
+    },
+    {
+      code: `
+        declare const g: Array<string>;
+        const [foo = ''] = g;
+      `,
+      errors: [
+        {
+          column: 22,
+          data: { type: 'property' },
+          endColumn: 24,
+          line: 3,
+          messageId: 'uselessDefaultAssignment',
+        },
+      ],
+      output: `
+        declare const g: Array<string>;
+        const [foo] = g;
+      `,
+    },
+  ],
+});
diff --git a/packages/eslint-plugin/tests/schema-snapshots/no-useless-default-assignment.shot b/packages/eslint-plugin/tests/schema-snapshots/no-useless-default-assignment.shot
new file mode 100644
index 00000000000..cdd9f837585
--- /dev/null
+++ b/packages/eslint-plugin/tests/schema-snapshots/no-useless-default-assignment.shot
@@ -0,0 +1,10 @@
+
+# SCHEMA:
+
+[]
+
+
+# TYPES:
+
+/** No options declared */
+type Options = [];