tools: use no-use-before-define ESLint rule

Also fix repl and url libs for the rule.

PR-URL: #14032
Refs: http://eslint.org/docs/rules/no-use-before-define
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>

.eslintrc.yaml

@@ -62,6 +62,9 @@ rules:
   no-delete-var: 2
   no-undef: 2
   no-unused-vars: [2, {args: none}]
+  no-use-before-define: [2, {classes: true,
+                             functions: false,
+                             variables: false}]
 
   # Node.js and CommonJS
   # http://eslint.org/docs/rules/#nodejs-and-commonjs

lib/_debugger.js

@@ -993,7 +993,8 @@ Interface.prototype.debugEval = function(code, context, filename, callback) {
     return;
   }
 
-  var frame = client.currentFrame === NO_FRAME ? frame : undefined;
+  var frame = client.currentFrame;
+  if (frame !== NO_FRAME) frame = undefined;
 
   self.pause();
 

lib/repl.js

@@ -846,6 +846,7 @@ function complete(line, callback) {
   var completeOn, i, group, c;
 
   // REPL commands (e.g. ".break").
+  var filter;
   var match = null;
   match = line.match(/^\s*\.(\w*)$/);
   if (match) {
@@ -865,7 +866,7 @@ function complete(line, callback) {
 
     completeOn = match[1];
     var subdir = match[2] || '';
-    var filter = match[1];
+    filter = match[1];
     var dir, files, f, name, base, ext, abs, subfiles, s;
     group = [];
     var paths = module.paths.concat(require('module').globalPaths);

test/parallel/test-tls-npn-server-client.js

@@ -1,11 +1,12 @@
 'use strict';
+
+const common = require('../common');
+
 if (!process.features.tls_npn) {
   common.skip('Skipping because node compiled without NPN feature of OpenSSL.');
   return;
 }
 
-const common = require('../common');
-
 if (!common.hasCrypto) {
   common.skip('missing crypto');
   return;

test/parallel/test-tls-sni-option.js

@@ -1,11 +1,12 @@
 'use strict';
+
+const common = require('../common');
+
 if (!process.features.tls_sni) {
   common.skip('node compiled without OpenSSL or with old OpenSSL version.');
   return;
 }
 
-const common = require('../common');
-
 if (!common.hasCrypto) {
   common.skip('missing crypto');
   return;

test/parallel/test-tls-sni-server-client.js

@@ -1,11 +1,11 @@
 'use strict';
+const common = require('../common');
+
 if (!process.features.tls_sni) {
   common.skip('node compiled without OpenSSL or with old OpenSSL version.');
   return;
 }
 
-const common = require('../common');
-
 if (!common.hasCrypto) {
   common.skip('missing crypto');
   return;