remove var and use let and const

test/parallel/test-child-process-kill.js

@@ -1,8 +1,8 @@
 'use strict';
-var common = require('../common');
-var assert = require('assert');
-var spawn = require('child_process').spawn;
-var cat = spawn(common.isWindows ? 'cmd' : 'cat');
+const common = require('../common');
+const assert = require('assert');
+const spawn = require('child_process').spawn;
+const cat = spawn(common.isWindows ? 'cmd' : 'cat');
 
 cat.stdout.on('end', common.mustCall(function() {}));
 cat.stderr.on('data', common.fail);
@@ -13,6 +13,6 @@ cat.on('exit', common.mustCall(function(code, signal) {
   assert.strictEqual(signal, 'SIGTERM');
 }));
 
-assert.equal(cat.killed, false);
+assert.strictEqual(cat.killed, false);
 cat.kill();
-assert.equal(cat.killed, true);
+assert.strictEqual(cat.killed, true);

test/parallel/test-net-reconnect-error.js

@@ -1,13 +1,13 @@
 'use strict';
-var common = require('../common');
-var net = require('net');
-var assert = require('assert');
-var N = 20;
-var client_error_count = 0;
-var disconnect_count = 0;
+const common = require('../common');
+const net = require('net');
+const assert = require('assert');
+const N = 20;
+let client_error_count = 0;
+let disconnect_count = 0;
 
 // Hopefully nothing is running on common.PORT
-var c = net.createConnection(common.PORT);
+const c = net.createConnection(common.PORT);
 
 c.on('connect', function() {
   console.error('CLIENT connected');
@@ -17,7 +17,7 @@ c.on('connect', function() {
 c.on('error', function(e) {
   console.error('CLIENT error: ' + e.code);
   client_error_count++;
-  assert.equal('ECONNREFUSED', e.code);
+  assert.strictEqual('ECONNREFUSED', e.code);
 });
 
 c.on('close', function() {
@@ -27,6 +27,6 @@ c.on('close', function() {
 });
 
 process.on('exit', function() {
-  assert.equal(N + 1, disconnect_count);
-  assert.equal(N + 1, client_error_count);
+  assert.strictEqual(N + 1, disconnect_count);
+  assert.strictEqual(N + 1, client_error_count);
 });

test/parallel/test-require-invalid-package.js

@@ -0,0 +1,9 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+// Should be an invalid package path.
+assert.throws(() => require('package.json'), (err) => {
+  return err && err.code === 'MODULE_NOT_FOUND';
+});