diff --git a/lib/github-auth.js b/lib/github-auth.js
index 31679259553f5..8704cb3971142 100644
--- a/lib/github-auth.js
+++ b/lib/github-auth.js
@@ -122,7 +122,7 @@ function sendTokenToAllServers(token) {
         strictSSL: false,
       };
       request(options, function(err, res, body) {
-        if (err != null) { return reject('Posting the GitHub user token failed: ' + err.stack); }
+        if (err != null) { return reject(err); }
         resolve();
       });
     });
diff --git a/lib/github-provider.js b/lib/github-provider.js
index 678a1becb8ce8..e9aea88768f87 100644
--- a/lib/github-provider.js
+++ b/lib/github-provider.js
@@ -17,7 +17,7 @@ const {
 
 // GitHub commits since integration.
 function mapGithubCommitsSince(camp, githubApiUrl, githubAuth) {
-  camp.route(/^\/github\/commits-since\/([^\/]+)\/([^\/]+)\/([^\/]+)\.(svg|png|gif|jpg|json)$/,
+  camp.route(/^\/github\/commits-since\/([^/]+)\/([^/]+)\/([^/]+)\.(svg|png|gif|jpg|json)$/,
     cache(function (data, match, sendBadge, request) {
       const user = match[1];  // eg, SubtitleEdit
       const repo = match[2];  // eg, subtitleedit
@@ -62,17 +62,14 @@ function mapGithubCommitsSince(camp, githubApiUrl, githubAuth) {
           try {
             const data = JSON.parse(buffer);
             setCommitsSinceBadge(user, repo, data.tag_name);
-            return;
           } catch (e) {
             badgeData.text[1] = 'invalid';
             sendBadge(format, badgeData);
-            return;
           }
         });
       } else {
         setCommitsSinceBadge(user, repo, version);
       }
-
     }));
 }
 
diff --git a/lib/lru-cache.js b/lib/lru-cache.js
index 1ef4262c0a965..6a5959521ee59 100644
--- a/lib/lru-cache.js
+++ b/lib/lru-cache.js
@@ -126,7 +126,7 @@ function getHeapSize() {
   }
 }
 function computeHeapSize() {
-  return heapSize = process.memoryUsage().heapTotal;
+  return (heapSize = process.memoryUsage().heapTotal);
 }
 
 module.exports = Cache;
diff --git a/lib/nexus-version.js b/lib/nexus-version.js
index efbe67e44e49a..3f3a51d306813 100644
--- a/lib/nexus-version.js
+++ b/lib/nexus-version.js
@@ -1,12 +1,8 @@
 'use strict';
 
 function isSnapshotVersion(version) {
-  const pattern = /(\d+\.)*\d\-SNAPSHOT/;
-  if (version) {
-    return version.match(pattern);
-  } else {
-    return false;
-  }
+  const pattern = /(\d+\.)*\d-SNAPSHOT/;
+  return version && version.match(pattern);
 }
 
 module.exports = {
diff --git a/lib/npm-provider.js b/lib/npm-provider.js
index b377b91a9caec..3d85b2981101d 100644
--- a/lib/npm-provider.js
+++ b/lib/npm-provider.js
@@ -6,7 +6,7 @@ const { metric } = require('./text-formatters');
 
 // npm downloads count
 function mapNpmDownloads(camp, urlComponent, apiUriComponent) {
-  camp.route(new RegExp('^\/npm\/' + urlComponent + '\/(.*)\.(svg|png|gif|jpg|json)$'),
+  camp.route(new RegExp('^/npm/' + urlComponent + '/(.*)\\.(svg|png|gif|jpg|json)$'),
   cache(function(data, match, sendBadge, request) {
     const pkg = encodeURIComponent(match[1]);  // eg, "express" or "@user/express"
     const format = match[2];
diff --git a/lib/php-version.js b/lib/php-version.js
index c1f45ba1a02ff..3f00b0199f806 100644
--- a/lib/php-version.js
+++ b/lib/php-version.js
@@ -160,7 +160,7 @@ function numberedVersionData(version) {
   // Try to convert to a list of numbers.
   function toNum (s) {
     let n = +s;
-    if (n !== n) {  // If n is NaN…
+    if (Number.isNaN(n)) {
       n = 0xffffffff;
     }
     return n;
diff --git a/lib/result-sender.js b/lib/result-sender.js
index 959a7f603db4f..4ea3a88caec74 100644
--- a/lib/result-sender.js
+++ b/lib/result-sender.js
@@ -1,15 +1,22 @@
 'use strict';
 
+const stream = require('stream');
 const log = require('./log');
 const svg2img = require('./svg-to-img');
 
+function streamFromString(str) {
+  const newStream = new stream.Readable();
+  newStream._read = () => { newStream.push(str); newStream.push(null); };
+  return newStream;
+}
+
 function makeSend(format, askres, end) {
   if (format === 'svg') {
-    return function(res) { sendSVG(res, askres, end); };
+    return res => sendSVG(res, askres, end);
   } else if (format === 'json') {
-    return function(res) { sendJSON(res, askres, end); };
+    return res => sendJSON(res, askres, end);
   } else {
-    return function(res) { sendOther(format, res, askres, end); };
+    return res => sendOther(format, res, askres, end);
   }
 }
 
@@ -37,13 +44,6 @@ function sendJSON(res, askres, end) {
   end(null, {template: streamFromString(res)});
 }
 
-const stream = require('stream');
-function streamFromString(str) {
-  const newStream = new stream.Readable();
-  newStream._read = function() { newStream.push(str); newStream.push(null); };
-  return newStream;
-}
-
 module.exports = {
   makeSend
 };
diff --git a/lib/suggest.js b/lib/suggest.js
index 244071e589ea0..40190bba420a1 100644
--- a/lib/suggest.js
+++ b/lib/suggest.js
@@ -137,7 +137,7 @@ function githubLicense (user, repo) {
                 let licenseFilename;
                 // Crawl each file in the root directory
                 for (let i = 0; i < treeArray.length; i++) {
-                  if (treeArray[i].type != 'blob') {
+                  if (treeArray[i].type !== 'blob') {
                     continue;
                   }
                   if (treeArray[i].path.match(/(LICENSE|COPYING|COPYRIGHT).*/i)) {
@@ -179,13 +179,13 @@ function githubLicense (user, repo) {
                       resolve(null);
                       return;
                     }
-                  } catch(e) { reject(e); return; }
+                  } catch(e) { reject(e); }
                 });
-              } catch(e) { reject(e); return; }
+              } catch(e) { reject(e); }
             });
-          } catch(e) { reject(e); return; }
+          } catch(e) { reject(e); }
         });
-      } catch(e) { reject(e); return; }
+      } catch(e) { reject(e); }
     });
   });
 }
diff --git a/lib/version.js b/lib/version.js
index 0500af97e71fd..1f442c1504e31 100644
--- a/lib/version.js
+++ b/lib/version.js
@@ -62,8 +62,8 @@ function latestDottedVersion(versions) {
 // Take string versions.
 // -1 if v1 < v2, 1 if v1 > v2, 0 otherwise.
 function compareDottedVersion(v1, v2) {
-  const parts1 = /([0-9\.]+)(.*)$/.exec(v1);
-  const parts2 = /([0-9\.]+)(.*)$/.exec(v2);
+  const parts1 = /([0-9.]+)(.*)$/.exec(v1);
+  const parts2 = /([0-9.]+)(.*)$/.exec(v2);
   if (parts1 != null && parts2 != null) {
     const numbers1 = parts1[1];
     const numbers2 = parts2[1];
diff --git a/service-tests/bower.js b/service-tests/bower.js
index c7b1a72bdb553..042d6b13fd09c 100644
--- a/service-tests/bower.js
+++ b/service-tests/bower.js
@@ -38,14 +38,14 @@ t.create('pre version. eg. bower|v0.2.5-alpha-rc-pre')
 .get('/vpre/bootstrap.json')
 .expectJSONTypes(Joi.object().keys({
   name: Joi.equal('bower'),
-  value: Joi.string().regex(/^v\d+(\.\d+)?(\.\d+)?(\-?\w)+?$/)
+  value: Joi.string().regex(/^v\d+(\.\d+)?(\.\d+)?(-?\w)+?$/)
 }));
 
 t.create('custom label for pre version. eg. pre verison|v0.2.5-alpha-rc-pre')
 .get('/vpre/bootstrap.json?label="pre verison"')
 .expectJSONTypes(Joi.object().keys({
   name: Joi.equal('pre verison'),
-  value: Joi.string().regex(/^v\d+(\.\d+)?(\.\d+)?(\-?\w)+?$/)
+  value: Joi.string().regex(/^v\d+(\.\d+)?(\.\d+)?(-?\w)+?$/)
 }));
 
 
diff --git a/service-tests/codecov.js b/service-tests/codecov.js
index 01e9d32d6d6f7..99d49a6ebd4dc 100644
--- a/service-tests/codecov.js
+++ b/service-tests/codecov.js
@@ -10,12 +10,12 @@ t.create('gets coverage status')
   .get('/c/github/codecov/example-python.json')
   .expectJSONTypes(Joi.object().keys({
     name: 'coverage',
-    value: Joi.string().regex(/^[0-9]+\%$/),
+    value: Joi.string().regex(/^[0-9]+%$/),
   }));
 
 t.create('gets coverate status for branch')
   .get('/c/github/codecov/example-python/master.json')
   .expectJSONTypes({
     name: 'coverage',
-    value: Joi.string().regex(/^[0-9]+\%$/),
+    value: Joi.string().regex(/^[0-9]+%$/),
   });