tools: enable block-scoped-var eslint rule

PR-URL: https://github.com/nodejs/node/pull/27616
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

5 files changed, 11 insertions, 8 deletions

diff --git a/benchmark/fixtures/simple-http-server.js b/benchmark/fixtures/simple-http-server.js
index 013ac468f5..2b4f1ea956 100644
--- a/benchmark/fixtures/simple-http-server.js
+++ b/benchmark/fixtures/simple-http-server.js
@@ -10,8 +10,9 @@ const storedUnicode = Object.create(null);
 const useDomains = process.env.NODE_USE_DOMAINS;
 
 // Set up one global domain.
+let domain;
 if (useDomains) {
-  var domain = require('domain');
+  domain = require('domain');
   const gdom = domain.create();
   gdom.on('error', (er) => {
     console.error('Error on global domain', er);
diff --git a/benchmark/http/_chunky_http_client.js b/benchmark/http/_chunky_http_client.js
index 5164f8c619..1bf7fa284a 100644
--- a/benchmark/http/_chunky_http_client.js
+++ b/benchmark/http/_chunky_http_client.js
@@ -16,7 +16,7 @@ function main({ len, n }) {
   const headers = [];
   // Chose 7 because 9 showed "Connection error" / "Connection closed"
   // An odd number could result in a better length dispersion.
-  for (var i = 7; i <= 7 * 7 * 7; i *= 7)
+  for (let i = 7; i <= 7 * 7 * 7; i *= 7)
     headers.push('o'.repeat(i));
 
   function WriteHTTPHeaders(channel, has_keep_alive, extra_header_count) {
@@ -31,7 +31,7 @@ function main({ len, n }) {
               'Chrome/39.0.2171.71 Safari/537.36');
     todo.push('Accept-Encoding: gzip, deflate, sdch');
     todo.push('Accept-Language: en-US,en;q=0.8');
-    for (var i = 0; i < extra_header_count; i++) {
+    for (let i = 0; i < extra_header_count; i++) {
       // Utilize first three powers of a small integer for an odd cycle and
       // because the fourth power of some integers overloads the server.
       todo.push(`X-Header-${i}: ${headers[i % 3]}`);
@@ -41,7 +41,7 @@ function main({ len, n }) {
     todo = todo.join('\r\n');
     // Using odd numbers in many places may increase length coverage.
     const chunksize = 37;
-    for (i = 0; i < todo.length; i += chunksize) {
+    for (let i = 0; i < todo.length; i += chunksize) {
       const cur = todo.slice(i, i + chunksize);
       channel.write(cur);
     }
diff --git a/benchmark/http/cluster.js b/benchmark/http/cluster.js
index 7f72db533e..c2d6d8e1a7 100644
--- a/benchmark/http/cluster.js
+++ b/benchmark/http/cluster.js
@@ -3,8 +3,9 @@ const common = require('../common.js');
 const PORT = common.PORT;
 
 const cluster = require('cluster');
+let bench;
 if (cluster.isMaster) {
-  var bench = common.createBenchmark(main, {
+  bench = common.createBenchmark(main, {
     // Unicode confuses ab on os x.
     type: ['bytes', 'buffer'],
     len: [4, 1024, 102400],
diff --git a/benchmark/napi/function_call/index.js b/benchmark/napi/function_call/index.js
index b63d805fe3..3eebf9c05a 100644
--- a/benchmark/napi/function_call/index.js
+++ b/benchmark/napi/function_call/index.js
@@ -11,8 +11,9 @@ const common = require('../../common.js');
 // which is quite common for benchmarks.  so in that case, just
 // abort quietly.
 
+let binding;
 try {
-  var binding = require(`./build/${common.buildType}/binding`);
+  binding = require(`./build/${common.buildType}/binding`);
 } catch {
   console.error('misc/function_call.js Binding failed to load');
   process.exit(0);
diff --git a/benchmark/util/priority-queue.js b/benchmark/util/priority-queue.js
index 9cff7cbbac..ea4601a002 100644
--- a/benchmark/util/priority-queue.js
+++ b/benchmark/util/priority-queue.js
@@ -10,9 +10,9 @@ function main({ n, type }) {
   const PriorityQueue = require('internal/priority_queue');
   const queue = new PriorityQueue();
   bench.start();
-  for (var i = 0; i < n; i++)
+  for (let i = 0; i < n; i++)
     queue.insert(Math.random() * 1e7 | 0);
-  for (i = 0; i < n; i++)
+  for (let i = 0; i < n; i++)
     queue.shift();
   bench.end(n);
 }