From 9bb77186a20610c533ac2c2da7fd72709dd1288d Mon Sep 17 00:00:00 2001
From: Sebastian Beltran <bjohansebas@gmail.com>
Date: Tue, 23 Dec 2025 23:27:05 -0500
Subject: [PATCH 1/4] feat(pluralize-deprecated-methods): migrate
 pluralize-methods to codemod.com

---
 .../pluralize-deprecated-methods/README.md    | 44 +++++++++++++++++++
 .../pluralize-deprecated-methods/codemod.yaml | 26 +++++++++++
 .../pluralize-deprecated-methods/package.json | 22 ++++++++++
 .../src/workflow.ts                           | 38 ++++++++++++++++
 .../tests/expected/charset.ts                 | 19 ++++++++
 .../tests/expected/encoding.ts                | 18 ++++++++
 .../tests/expected/language.ts                | 18 ++++++++
 .../tests/input/charset.ts                    | 19 ++++++++
 .../tests/input/encoding.ts                   | 18 ++++++++
 .../tests/input/language.ts                   | 18 ++++++++
 .../workflow.yaml                             | 28 ++++++++++++
 11 files changed, 268 insertions(+)
 create mode 100644 codemods/pluralize-deprecated-methods/README.md
 create mode 100644 codemods/pluralize-deprecated-methods/codemod.yaml
 create mode 100644 codemods/pluralize-deprecated-methods/package.json
 create mode 100644 codemods/pluralize-deprecated-methods/src/workflow.ts
 create mode 100644 codemods/pluralize-deprecated-methods/tests/expected/charset.ts
 create mode 100644 codemods/pluralize-deprecated-methods/tests/expected/encoding.ts
 create mode 100644 codemods/pluralize-deprecated-methods/tests/expected/language.ts
 create mode 100644 codemods/pluralize-deprecated-methods/tests/input/charset.ts
 create mode 100644 codemods/pluralize-deprecated-methods/tests/input/encoding.ts
 create mode 100644 codemods/pluralize-deprecated-methods/tests/input/language.ts
 create mode 100644 codemods/pluralize-deprecated-methods/workflow.yaml

diff --git a/codemods/pluralize-deprecated-methods/README.md b/codemods/pluralize-deprecated-methods/README.md
new file mode 100644
index 0000000..f345f23
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/README.md
@@ -0,0 +1,44 @@
+# Migrate pluralized request methods
+
+Migrates deprecated request methods to their pluralized versions that were deprecated in Express 4 and removed in Express 5.
+
+## Example
+
+### Migrating `req.acceptsCharset(charset)`
+
+The migration involves replacing instances of `req.acceptsCharset(charset)` with `req.acceptsCharsets(charset)`.
+
+```diff
+app.get('/', (req, res) => {
+- const charset = req.acceptsCharset('utf-8');
++ const charset = req.acceptsCharsets('utf-8');
+  res.json({ charset });
+});
+```
+### Migrating `req.acceptsEncoding(encoding)
+
+The migration involves replacing instances of `req.acceptsEncoding(encoding)` with `req.acceptsEncodings(encoding)`.
+
+```diff
+app.get('/', (req, res) => {
+- const encoding = req.acceptsEncoding('gzip');
++ const encoding = req.acceptsEncodings('gzip');
+  res.json({ encoding });
+});
+```
+
+### Migrating `req.acceptsLanguage(language)`
+
+The migration involves replacing instances of `req.acceptsLanguage(language)` with `req.acceptsLanguages(language)`.
+
+```diff
+app.get('/', (req, res) => {
+- const language = req.acceptsLanguage('en');
++ const language = req.acceptsLanguages('en');
+  res.json({ language });
+});
+```
+
+## References
+
+- [Migration of pluralized request methods](https://expressjs.com/en/guide/migrating-5.html#plural)
diff --git a/codemods/pluralize-deprecated-methods/codemod.yaml b/codemods/pluralize-deprecated-methods/codemod.yaml
new file mode 100644
index 0000000..301ab57
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/codemod.yaml
@@ -0,0 +1,26 @@
+schema_version: "1.0"
+name: "@expressjs/pluralize-deprecated-methods"
+version: "1.0.0"
+description: Migrates usage of deprecated singular request methods to their pluralized versions in Express.js applications.
+author: bjohansebas (Sebastian Beltran)
+license: MIT
+workflow: workflow.yaml
+category: migration
+
+targets:
+  languages:
+    - javascript
+    - typescript
+
+keywords:
+  - transformation
+  - migration
+  - express
+  - accepts
+  - accepetsCharsets
+  - acceptsEncodings
+  - acceptsLanguages
+
+registry:
+  access: public
+  visibility: public
\ No newline at end of file
diff --git a/codemods/pluralize-deprecated-methods/package.json b/codemods/pluralize-deprecated-methods/package.json
new file mode 100644
index 0000000..abc8571
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "@expressjs/pluralize-deprecated-methods",
+  "private": true,
+  "version": "1.0.0",
+  "description": "Migrates usage of deprecated singular request methods to their pluralized versions in Express.js applications.",
+  "type": "module",
+  "scripts": {
+    "test": "npx codemod jssg test -l typescript ./src/workflow.ts ./"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/expressjs/codemod.git",
+    "directory": "codemods/pluralize-deprecated-methods",
+    "bugs": "https://github.com/expressjs/codemod/issues"
+  },
+  "author": "bjohansebas (Sebastian Beltran)",
+  "license": "MIT",
+  "homepage": "https://github.com/expressjs/codemod/blob/main/codemods/pluralize-deprecated-methods/README.md",
+  "devDependencies": {
+    "@codemod.com/jssg-types": "^1.3.1"
+  }
+}
diff --git a/codemods/pluralize-deprecated-methods/src/workflow.ts b/codemods/pluralize-deprecated-methods/src/workflow.ts
new file mode 100644
index 0000000..4b5b41e
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/src/workflow.ts
@@ -0,0 +1,38 @@
+import type Js from '@codemod.com/jssg-types/src/langs/javascript'
+import type { Edit, SgRoot } from '@codemod.com/jssg-types/src/main'
+
+async function transform(root: SgRoot<Js>): Promise<string | null> {
+  const rootNode = root.root()
+
+  const nodes = rootNode.findAll({
+    rule: {
+      any: [
+        { pattern: '$OBJ.$METHOD($ARG)' },
+        {
+          pattern: '$OBJ.$METHOD()',
+        },
+      ],
+    },
+    constraints: {
+      METHOD: { regex: '^(acceptsCharset|acceptsEncoding|acceptsLanguage)$' },
+    },
+  })
+
+  const edits: Edit[] = []
+
+  for (const call of nodes) {
+    const method = call.getMatch('METHOD')
+    const obj = call.getMatch('OBJ')
+    if (!obj || !method) continue
+
+    const objDef = obj.definition({ resolveExternal: false })
+    if (!objDef) continue
+
+    edits.push(method.replace(`${method.text()}s`))
+  }
+
+  if (edits.length === 0) return null
+  return rootNode.commitEdits(edits)
+}
+
+export default transform
diff --git a/codemods/pluralize-deprecated-methods/tests/expected/charset.ts b/codemods/pluralize-deprecated-methods/tests/expected/charset.ts
new file mode 100644
index 0000000..73713dd
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/tests/expected/charset.ts
@@ -0,0 +1,19 @@
+import express from 'express'
+
+const app = express()
+
+app.get('/', (req, res) => {
+    const charset = req.acceptsCharsets();
+    res.json({ charset });
+});
+
+
+app.get('/', (req, res) => {
+    const charset = req.acceptsCharsets('utf-8');
+    res.json({ charset });
+});
+
+app.get('/', function (request, response) {
+    const charset = request.acceptsCharsets('utf-8');
+    response.json({ charset });
+});
\ No newline at end of file
diff --git a/codemods/pluralize-deprecated-methods/tests/expected/encoding.ts b/codemods/pluralize-deprecated-methods/tests/expected/encoding.ts
new file mode 100644
index 0000000..bf2c3f4
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/tests/expected/encoding.ts
@@ -0,0 +1,18 @@
+import express from 'express'
+
+const app = express()
+
+app.get('/', (req, res) => {
+    const encoding = req.acceptsEncodings();
+    res.json({ encoding });
+});
+
+app.get('/', (req, res) => {
+    const encoding = req.acceptsEncodings('gzip');
+    res.json({ encoding });
+});
+
+app.get('/', function (request, response) {
+    const encoding = request.acceptsEncodings('gzip');
+    response.json({ encoding });
+});
\ No newline at end of file
diff --git a/codemods/pluralize-deprecated-methods/tests/expected/language.ts b/codemods/pluralize-deprecated-methods/tests/expected/language.ts
new file mode 100644
index 0000000..5c4f2b9
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/tests/expected/language.ts
@@ -0,0 +1,18 @@
+import express from 'express'
+
+const app = express()
+
+app.get('/', (req, res) => {
+    const encoding = req.acceptsLanguages();
+    res.json({ encoding });
+});
+
+app.get('/', (req, res) => {
+    const encoding = req.acceptsLanguages('gzip');
+    res.json({ encoding });
+});
+
+app.get('/', function (request, response) {
+    const encoding = request.acceptsLanguages('gzip');
+    response.json({ encoding });
+});
\ No newline at end of file
diff --git a/codemods/pluralize-deprecated-methods/tests/input/charset.ts b/codemods/pluralize-deprecated-methods/tests/input/charset.ts
new file mode 100644
index 0000000..5e7c962
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/tests/input/charset.ts
@@ -0,0 +1,19 @@
+import express from 'express'
+
+const app = express()
+
+app.get('/', (req, res) => {
+    const charset = req.acceptsCharset();
+    res.json({ charset });
+});
+
+
+app.get('/', (req, res) => {
+    const charset = req.acceptsCharset('utf-8');
+    res.json({ charset });
+});
+
+app.get('/', function (request, response) {
+    const charset = request.acceptsCharset('utf-8');
+    response.json({ charset });
+});
\ No newline at end of file
diff --git a/codemods/pluralize-deprecated-methods/tests/input/encoding.ts b/codemods/pluralize-deprecated-methods/tests/input/encoding.ts
new file mode 100644
index 0000000..fa130ca
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/tests/input/encoding.ts
@@ -0,0 +1,18 @@
+import express from 'express'
+
+const app = express()
+
+app.get('/', (req, res) => {
+    const encoding = req.acceptsEncoding();
+    res.json({ encoding });
+});
+
+app.get('/', (req, res) => {
+    const encoding = req.acceptsEncoding('gzip');
+    res.json({ encoding });
+});
+
+app.get('/', function (request, response) {
+    const encoding = request.acceptsEncoding('gzip');
+    response.json({ encoding });
+});
\ No newline at end of file
diff --git a/codemods/pluralize-deprecated-methods/tests/input/language.ts b/codemods/pluralize-deprecated-methods/tests/input/language.ts
new file mode 100644
index 0000000..a719ed3
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/tests/input/language.ts
@@ -0,0 +1,18 @@
+import express from 'express'
+
+const app = express()
+
+app.get('/', (req, res) => {
+    const encoding = req.acceptsLanguage();
+    res.json({ encoding });
+});
+
+app.get('/', (req, res) => {
+    const encoding = req.acceptsLanguage('gzip');
+    res.json({ encoding });
+});
+
+app.get('/', function (request, response) {
+    const encoding = request.acceptsLanguage('gzip');
+    response.json({ encoding });
+});
\ No newline at end of file
diff --git a/codemods/pluralize-deprecated-methods/workflow.yaml b/codemods/pluralize-deprecated-methods/workflow.yaml
new file mode 100644
index 0000000..4dcf1d6
--- /dev/null
+++ b/codemods/pluralize-deprecated-methods/workflow.yaml
@@ -0,0 +1,28 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/codemod-com/codemod/refs/heads/main/schemas/workflow.json
+
+version: "1"
+
+nodes:
+  - id: apply-transforms
+    name: Apply AST Transformations
+    type: automatic
+    runtime:
+      type: direct
+    steps:
+      - name: Migrates usage of deprecated singular request methods to their pluralized versions in Express.js applications.
+        js-ast-grep:
+          js_file: src/workflow.ts
+          base_path: .
+          semantic_analysis: file
+          include:
+            - "**/*.cjs"
+            - "**/*.js"
+            - "**/*.jsx"
+            - "**/*.mjs"
+            - "**/*.cts"
+            - "**/*.mts"
+            - "**/*.ts"
+            - "**/*.tsx"
+          exclude:
+            - "**/node_modules/**"
+          language: typescript
\ No newline at end of file

From 89a2840d0277f91da4d04892a81b65d2b01f11e9 Mon Sep 17 00:00:00 2001
From: Sebastian Beltran <bjohansebas@gmail.com>
Date: Thu, 25 Dec 2025 22:36:57 -0500
Subject: [PATCH 2/4] rename codemod

---
 .../README.md                                               | 0
 .../codemod.yaml                                            | 2 +-
 .../package.json                                            | 6 +++---
 .../src/workflow.ts                                         | 0
 .../tests/expected/charset.ts                               | 0
 .../tests/expected/encoding.ts                              | 0
 .../tests/expected/language.ts                              | 0
 .../tests/input/charset.ts                                  | 0
 .../tests/input/encoding.ts                                 | 0
 .../tests/input/language.ts                                 | 0
 .../workflow.yaml                                           | 0
 11 files changed, 4 insertions(+), 4 deletions(-)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/README.md (100%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/codemod.yaml (91%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/package.json (80%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/src/workflow.ts (100%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/tests/expected/charset.ts (100%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/tests/expected/encoding.ts (100%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/tests/expected/language.ts (100%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/tests/input/charset.ts (100%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/tests/input/encoding.ts (100%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/tests/input/language.ts (100%)
 rename codemods/{pluralize-deprecated-methods => pluralize-method-names}/workflow.yaml (100%)

diff --git a/codemods/pluralize-deprecated-methods/README.md b/codemods/pluralize-method-names/README.md
similarity index 100%
rename from codemods/pluralize-deprecated-methods/README.md
rename to codemods/pluralize-method-names/README.md
diff --git a/codemods/pluralize-deprecated-methods/codemod.yaml b/codemods/pluralize-method-names/codemod.yaml
similarity index 91%
rename from codemods/pluralize-deprecated-methods/codemod.yaml
rename to codemods/pluralize-method-names/codemod.yaml
index 301ab57..5dd23c2 100644
--- a/codemods/pluralize-deprecated-methods/codemod.yaml
+++ b/codemods/pluralize-method-names/codemod.yaml
@@ -1,5 +1,5 @@
 schema_version: "1.0"
-name: "@expressjs/pluralize-deprecated-methods"
+name: "@expressjs/pluralize-method-names"
 version: "1.0.0"
 description: Migrates usage of deprecated singular request methods to their pluralized versions in Express.js applications.
 author: bjohansebas (Sebastian Beltran)
diff --git a/codemods/pluralize-deprecated-methods/package.json b/codemods/pluralize-method-names/package.json
similarity index 80%
rename from codemods/pluralize-deprecated-methods/package.json
rename to codemods/pluralize-method-names/package.json
index abc8571..1c3cd1c 100644
--- a/codemods/pluralize-deprecated-methods/package.json
+++ b/codemods/pluralize-method-names/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "@expressjs/pluralize-deprecated-methods",
+  "name": "@expressjs/pluralize-method-names",
   "private": true,
   "version": "1.0.0",
   "description": "Migrates usage of deprecated singular request methods to their pluralized versions in Express.js applications.",
@@ -10,12 +10,12 @@
   "repository": {
     "type": "git",
     "url": "git+https://github.com/expressjs/codemod.git",
-    "directory": "codemods/pluralize-deprecated-methods",
+    "directory": "codemods/pluralize-method-names",
     "bugs": "https://github.com/expressjs/codemod/issues"
   },
   "author": "bjohansebas (Sebastian Beltran)",
   "license": "MIT",
-  "homepage": "https://github.com/expressjs/codemod/blob/main/codemods/pluralize-deprecated-methods/README.md",
+  "homepage": "https://github.com/expressjs/codemod/blob/main/codemods/pluralize-method-names/README.md",
   "devDependencies": {
     "@codemod.com/jssg-types": "^1.3.1"
   }
diff --git a/codemods/pluralize-deprecated-methods/src/workflow.ts b/codemods/pluralize-method-names/src/workflow.ts
similarity index 100%
rename from codemods/pluralize-deprecated-methods/src/workflow.ts
rename to codemods/pluralize-method-names/src/workflow.ts
diff --git a/codemods/pluralize-deprecated-methods/tests/expected/charset.ts b/codemods/pluralize-method-names/tests/expected/charset.ts
similarity index 100%
rename from codemods/pluralize-deprecated-methods/tests/expected/charset.ts
rename to codemods/pluralize-method-names/tests/expected/charset.ts
diff --git a/codemods/pluralize-deprecated-methods/tests/expected/encoding.ts b/codemods/pluralize-method-names/tests/expected/encoding.ts
similarity index 100%
rename from codemods/pluralize-deprecated-methods/tests/expected/encoding.ts
rename to codemods/pluralize-method-names/tests/expected/encoding.ts
diff --git a/codemods/pluralize-deprecated-methods/tests/expected/language.ts b/codemods/pluralize-method-names/tests/expected/language.ts
similarity index 100%
rename from codemods/pluralize-deprecated-methods/tests/expected/language.ts
rename to codemods/pluralize-method-names/tests/expected/language.ts
diff --git a/codemods/pluralize-deprecated-methods/tests/input/charset.ts b/codemods/pluralize-method-names/tests/input/charset.ts
similarity index 100%
rename from codemods/pluralize-deprecated-methods/tests/input/charset.ts
rename to codemods/pluralize-method-names/tests/input/charset.ts
diff --git a/codemods/pluralize-deprecated-methods/tests/input/encoding.ts b/codemods/pluralize-method-names/tests/input/encoding.ts
similarity index 100%
rename from codemods/pluralize-deprecated-methods/tests/input/encoding.ts
rename to codemods/pluralize-method-names/tests/input/encoding.ts
diff --git a/codemods/pluralize-deprecated-methods/tests/input/language.ts b/codemods/pluralize-method-names/tests/input/language.ts
similarity index 100%
rename from codemods/pluralize-deprecated-methods/tests/input/language.ts
rename to codemods/pluralize-method-names/tests/input/language.ts
diff --git a/codemods/pluralize-deprecated-methods/workflow.yaml b/codemods/pluralize-method-names/workflow.yaml
similarity index 100%
rename from codemods/pluralize-deprecated-methods/workflow.yaml
rename to codemods/pluralize-method-names/workflow.yaml

From 997bdc756a2cc2aa918b03aaaa51aaeebaf9106e Mon Sep 17 00:00:00 2001
From: Sebastian Beltran <bjohansebas@gmail.com>
Date: Fri, 9 Jan 2026 17:24:50 -0500
Subject: [PATCH 3/4] apply suggestions

---
 codemods/pluralize-method-names/src/workflow.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/codemods/pluralize-method-names/src/workflow.ts b/codemods/pluralize-method-names/src/workflow.ts
index 4b5b41e..1baf93a 100644
--- a/codemods/pluralize-method-names/src/workflow.ts
+++ b/codemods/pluralize-method-names/src/workflow.ts
@@ -18,6 +18,8 @@ async function transform(root: SgRoot<Js>): Promise<string | null> {
     },
   })
 
+  if (!nodes.length) return null
+
   const edits: Edit[] = []
 
   for (const call of nodes) {
@@ -31,7 +33,8 @@ async function transform(root: SgRoot<Js>): Promise<string | null> {
     edits.push(method.replace(`${method.text()}s`))
   }
 
-  if (edits.length === 0) return null
+  if (!edits.length) return null
+
   return rootNode.commitEdits(edits)
 }
 

From 09a35ec8d832b1c21c31ed65f4ce8972413e479a Mon Sep 17 00:00:00 2001
From: Sebastian Beltran <bjohansebas@gmail.com>
Date: Fri, 9 Jan 2026 17:26:42 -0500
Subject: [PATCH 4/4] chore: update repository URL in codemod.yaml

---
 codemods/pluralize-method-names/codemod.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/codemods/pluralize-method-names/codemod.yaml b/codemods/pluralize-method-names/codemod.yaml
index 5dd23c2..56ba749 100644
--- a/codemods/pluralize-method-names/codemod.yaml
+++ b/codemods/pluralize-method-names/codemod.yaml
@@ -5,6 +5,7 @@ description: Migrates usage of deprecated singular request methods to their plur
 author: bjohansebas (Sebastian Beltran)
 license: MIT
 workflow: workflow.yaml
+repository: "https://github.com/expressjs/codemod/tree/HEAD/codemods/pluralize-method-names"
 category: migration
 
 targets: