Bump Eslint & drop nodejs 6

.travis.yml

@@ -8,13 +8,11 @@ cache:
     - node_modules
 
 node_js:
-  - "6"
+  - "8"
+  - "10"
   - "node"
 
 script:
-  # For older versions of npm (ie. the one bundled with Node 6), we need to manually run `prepare`
-  # to build the project. You can still install and consume the package without any issue.
-  - if [[ "$TRAVIS_NODE_VERSION" == "6" ]]; then npm run prepare; fi
   - npm run eslint
   - npm run test-cov
 

lib/highlight.js

@@ -8,7 +8,7 @@ const alias = require('../highlight_alias.json');
 function highlightUtil(str, options = {}) {
   if (typeof str !== 'string') throw new TypeError('str must be a string!');
 
-  const useHljs = options.hasOwnProperty('hljs') ? options.hljs : false;
+  const useHljs = Object.prototype.hasOwnProperty.call(options, 'hljs') ? options.hljs : false;
   const {
     gutter = true,
     firstLine = 1,

lib/permalink.js

@@ -15,7 +15,7 @@ function Permalink(rule, options) {
     .replace(rParam, (match, name) => {
       params.push(name);
 
-      if (segments.hasOwnProperty(name)) {
+      if (Object.prototype.hasOwnProperty.call(segments, name)) {
         const segment = segments[name];
 
         if (segment instanceof RegExp) {

package.json

@@ -27,7 +27,7 @@
   "license": "MIT",
   "devDependencies": {
     "chai": "^4.2.0",
-    "eslint": "^5.9.0",
+    "eslint": "^6.0.1",
     "eslint-config-hexo": "^3.0.0",
     "html-tag-validator": "^1.5.0",
     "istanbul": "^0.4.3",
@@ -43,6 +43,6 @@
     "striptags": "^3.1.1"
   },
   "engines": {
-    "node": ">=6.9.0"
+    "node": ">=8.6.0"
   }
 }

test/scripts/spawn.js

@@ -44,7 +44,10 @@ describe('spawn', () => {
 
     spawn.__set__('process', {
       stdout: stdoutCache,
-      stderr: stderrCache
+      stderr: stderrCache,
+      removeListener: () => {},
+      on: () => {},
+      exit: () => {}
     });
 
     return spawn('echo', [content], {
@@ -61,7 +64,10 @@ describe('spawn', () => {
 
     spawn.__set__('process', {
       stdout: stdoutCache,
-      stderr: stderrCache
+      stderr: stderrCache,
+      removeListener: () => {},
+      on: () => {},
+      exit: () => {}
     });
 
     return spawn('cat', ['nothing'], {