chore: enforce explicit Buffer import and add lint rule (#6525)

Signed-off-by: Shivam Sharma <meshivam81@gmail.com>

test/express.json.js

@@ -2,6 +2,7 @@
 
 var assert = require('node:assert')
 var AsyncLocalStorage = require('node:async_hooks').AsyncLocalStorage
+const { Buffer } = require('node:buffer');
 
 var express = require('..')
 var request = require('supertest')

test/express.raw.js

@@ -5,6 +5,7 @@ var AsyncLocalStorage = require('node:async_hooks').AsyncLocalStorage
 
 var express = require('..')
 var request = require('supertest')
+const { Buffer } = require('node:buffer');
 
 describe('express.raw()', function () {
   before(function () {

test/express.static.js

@@ -3,6 +3,8 @@
 var assert = require('node:assert')
 var express = require('..')
 var path = require('node:path')
+const { Buffer } = require('node:buffer');
+
 var request = require('supertest')
 var utils = require('./support/utils')
 

test/express.text.js

@@ -2,7 +2,7 @@
 
 var assert = require('node:assert')
 var AsyncLocalStorage = require('node:async_hooks').AsyncLocalStorage
-
+const { Buffer } = require('node:buffer');
 var express = require('..')
 var request = require('supertest')
 

test/express.urlencoded.js

@@ -2,6 +2,7 @@
 
 var assert = require('node:assert')
 var AsyncLocalStorage = require('node:async_hooks').AsyncLocalStorage
+const { Buffer } = require('node:buffer');
 
 var express = require('..')
 var request = require('supertest')

test/res.attachment.js

@@ -1,5 +1,7 @@
 'use strict'
 
+const { Buffer } = require('node:buffer');
+
 var express = require('../')
   , request = require('supertest');
 

test/res.download.js

@@ -3,6 +3,7 @@
 var after = require('after');
 var assert = require('node:assert')
 var AsyncLocalStorage = require('node:async_hooks').AsyncLocalStorage
+const { Buffer } = require('node:buffer');
 
 var express = require('..');
 var path = require('node:path')

test/res.send.js

@@ -1,6 +1,7 @@
 'use strict'
 
 var assert = require('node:assert')
+const { Buffer } = require('node:buffer');
 var express = require('..');
 var methods = require('../lib/utils').methods;
 var request = require('supertest');

test/res.sendFile.js

@@ -3,6 +3,7 @@
 var after = require('after');
 var assert = require('node:assert')
 var AsyncLocalStorage = require('node:async_hooks').AsyncLocalStorage
+const { Buffer } = require('node:buffer');
 
 var express = require('../')
   , request = require('supertest')

test/support/utils.js

@@ -5,6 +5,7 @@
  */
 
 var assert = require('node:assert');
+const { Buffer } = require('node:buffer');
 
 /**
  * Module exports.

test/utils.js

@@ -1,6 +1,7 @@
 'use strict'
 
 var assert = require('node:assert');
+const { Buffer } = require('node:buffer');
 var utils = require('../lib/utils');
 
 describe('utils.etag(body, encoding)', function(){