feat(pluralize-deprecated-methods): migrate pluralize-methods to codemod.com

Author: bjohansebas

codemods/pluralize-deprecated-methods/README.md

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+# 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)

codemods/pluralize-deprecated-methods/codemod.yaml

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+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

codemods/pluralize-deprecated-methods/package.json

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+{
+  "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"
+  }
+}

codemods/pluralize-deprecated-methods/src/workflow.ts

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+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

codemods/pluralize-deprecated-methods/tests/expected/charset.ts

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+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 });
+});

codemods/pluralize-deprecated-methods/tests/expected/encoding.ts

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+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 });
+});

codemods/pluralize-deprecated-methods/tests/expected/language.ts

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+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 });
+});

codemods/pluralize-deprecated-methods/tests/input/charset.ts

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+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 });
+});

codemods/pluralize-deprecated-methods/tests/input/encoding.ts

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+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 });
+});

codemods/pluralize-deprecated-methods/tests/input/language.ts

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+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 });
+});