Fix linting errors

Author: pvdlg

src/index.js

@@ -93,7 +93,7 @@ function createPostcssPreprocessor(args, config, logger, server) {
 
                 if (index !== -1) {
                   dependencies[keys[i]].splice(index, 1);
-                  if (!dependencies[keys[i]].length) {
+                  if (!dependencies[keys[i]].length > 0) {
                     stopWatching.push(keys[i]);
                     log.debug('Stop watching "%s"', keys[i]);
                     delete dependencies[keys[i]];
@@ -102,10 +102,10 @@ function createPostcssPreprocessor(args, config, logger, server) {
               }
             }
 
-            if (startWatching.length) {
+            if (startWatching.length > 0) {
               watcher.add(startWatching);
             }
-            if (stopWatching.length) {
+            if (stopWatching.length > 0) {
               watcher.unwatch(stopWatching);
             }
           }

test/helpers/karma.js

@@ -110,7 +110,7 @@ export async function waitForRunComplete(server) {
 
     return result;
   } catch (err) {
-    if (err instanceof Array) {
+    if (Array.isArray(err)) {
       const [{lastResult: {success, failed, error, disconnected}}, errMsg] = err;
 
       return {success, failed, error, disconnected, exitCode: 1, errMsg};