tools: lint for spacing around unary operators

Enable `space-unary-ops` in `.eslintrc`. This prohibits things like:

    i ++        // use `i++` instead
    typeof(foo) // use `typeof foo` or `typeof (foo)` instead

Ref: https://github.com/nodejs/node/pull/4772#discussion_r51732299
PR-URL: https://github.com/nodejs/node/pull/5063
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/test/parallel/test-http-date-header.js b/test/parallel/test-http-date-header.js
index 4c73800a8e..5ed7fc620b 100644
--- a/test/parallel/test-http-date-header.js
+++ b/test/parallel/test-http-date-header.js
@@ -6,7 +6,7 @@ var http = require('http');
 var testResBody = 'other stuff!\n';
 
 var server = http.createServer(function(req, res) {
-  assert.ok(! ('date' in req.headers),
+  assert.ok(!('date' in req.headers),
             'Request headers contained a Date.');
   res.writeHead(200, {
     'Content-Type': 'text/plain'