From 188498a3b284d8809b3dcd2c32b4e9d9155358cc Mon Sep 17 00:00:00 2001
From: Roman <dev@rman.dev>
Date: Wed, 8 Apr 2026 14:44:20 +0100
Subject: [PATCH 1/4] feat: add `@75lb/deep-merge` to preferred manifest

---
 docs/modules/README.md     |  1 +
 docs/modules/deep-merge.md | 15 +++++++++++++++
 manifests/preferred.json   |  8 +++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 docs/modules/deep-merge.md

diff --git a/docs/modules/README.md b/docs/modules/README.md
index 5c8dda3..006a8f7 100644
--- a/docs/modules/README.md
+++ b/docs/modules/README.md
@@ -12,6 +12,7 @@ ESLint plugin.
 
 ## List of modules
 
+- [`@75lb/deep-merge`](./deep-merge.md)
 - [`@jsdevtools/ezspawn`](./ez-spawn.md)
 - [`axios`](./fetch.md)
 - [`bluebird`](./bluebird-q.md)
diff --git a/docs/modules/deep-merge.md b/docs/modules/deep-merge.md
new file mode 100644
index 0000000..5a59210
--- /dev/null
+++ b/docs/modules/deep-merge.md
@@ -0,0 +1,15 @@
+---
+description: Modern alternatives to the @75lb/deep-merge package for deep merging objects
+---
+
+# Replacements for `@75lb/deep-merge`
+
+## `defu`
+
+If you need to deep merge two objects, you can use [`defu`](https://github.com/unjs/defu):
+
+```ts
+import { defu } from 'defu'
+
+const options = defu(object, ...defaults)
+```
diff --git a/manifests/preferred.json b/manifests/preferred.json
index c06ac71..ff309c0 100644
--- a/manifests/preferred.json
+++ b/manifests/preferred.json
@@ -1,5 +1,11 @@
 {
   "mappings": {
+    "@75lb/deep-merge": {
+      "type": "module",
+      "moduleName": "@75lb/deep-merge",
+      "replacements": ["defu"],
+      "url": {"type": "e18e", "id": "deep-merge"}
+    },
     "@iarna/toml": {
       "type": "module",
       "moduleName": "@iarna/toml",
@@ -2967,7 +2973,7 @@
     "defu": {
       "id": "defu",
       "type": "documented",
-      "url": {"type": "e18e", "id": "extend"},
+      "url": {"type": "e18e", "id": "deep-merge"},
       "replacementModule": "defu"
     },
     "dequal": {

From 3b4b73cdaeb263823d4a32a7415c04bd08ff4fa6 Mon Sep 17 00:00:00 2001
From: Roman <dev@rman.dev>
Date: Wed, 8 Apr 2026 17:21:57 +0100
Subject: [PATCH 2/4] update doc

---
 docs/modules/deep-merge.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/modules/deep-merge.md b/docs/modules/deep-merge.md
index 5a59210..6cb29d2 100644
--- a/docs/modules/deep-merge.md
+++ b/docs/modules/deep-merge.md
@@ -1,8 +1,8 @@
 ---
-description: Modern alternatives to the @75lb/deep-merge package for deep merging objects
+description: Modern alternatives to packages for deep merging objects
 ---
 
-# Replacements for `@75lb/deep-merge`
+# Replacements to packages for deep merging objects
 
 ## `defu`
 

From ab25fe3135f8d2aa33909e2703bc122d0c70cbc9 Mon Sep 17 00:00:00 2001
From: James Garbutt <43081j@users.noreply.github.com>
Date: Sat, 11 Apr 2026 13:44:03 +0100
Subject: [PATCH 3/4] Apply suggestion from @43081j

---
 docs/modules/deep-merge.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/modules/deep-merge.md b/docs/modules/deep-merge.md
index 6cb29d2..c0f6e3a 100644
--- a/docs/modules/deep-merge.md
+++ b/docs/modules/deep-merge.md
@@ -2,7 +2,7 @@
 description: Modern alternatives to packages for deep merging objects
 ---
 
-# Replacements to packages for deep merging objects
+# Replacements for deep merge packages
 
 ## `defu`
 

From e8342a6971b5db4024f0f4d0f3d030f62243f35c Mon Sep 17 00:00:00 2001
From: James Garbutt <43081j@users.noreply.github.com>
Date: Sat, 11 Apr 2026 13:49:40 +0100
Subject: [PATCH 4/4] chore: add fastify

---
 docs/modules/deep-merge.md | 14 +++++++++++++-
 manifests/preferred.json   |  8 +++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/docs/modules/deep-merge.md b/docs/modules/deep-merge.md
index c0f6e3a..9b62396 100644
--- a/docs/modules/deep-merge.md
+++ b/docs/modules/deep-merge.md
@@ -11,5 +11,17 @@ If you need to deep merge two objects, you can use [`defu`](https://github.com/u
 ```ts
 import { defu } from 'defu'
 
-const options = defu(object, ...defaults)
+const options = defu(object, defaults)
+```
+
+## `@fastify/deepmerge`
+
+The [`@fastify/deepmerge`](https://github.com/fastify/deepmerge) package is another fast and small alternative.
+
+It also offers more options for customizing the merge behavior than other libraries.
+
+```ts
+import deepMerge from '@fastify/deepmerge'
+
+const options = deepMerge(object, defaults)
 ```
diff --git a/manifests/preferred.json b/manifests/preferred.json
index ff309c0..66c1a3f 100644
--- a/manifests/preferred.json
+++ b/manifests/preferred.json
@@ -3,7 +3,7 @@
     "@75lb/deep-merge": {
       "type": "module",
       "moduleName": "@75lb/deep-merge",
-      "replacements": ["defu"],
+      "replacements": ["defu", "@fastify/deepmerge"],
       "url": {"type": "e18e", "id": "deep-merge"}
     },
     "@iarna/toml": {
@@ -2745,6 +2745,12 @@
       "url": {"type": "e18e", "id": "faker"},
       "replacementModule": "@faker-js/faker"
     },
+    "@fastify/deepmerge": {
+      "id": "@fastify/deepmerge",
+      "type": "documented",
+      "url": {"type": "e18e", "id": "deep-merge"},
+      "replacementModule": "@fastify/deepmerge"
+    },
     "@material/web": {
       "id": "@material/web",
       "type": "documented",