refactor: direct call without using function()

scripts/addCss.js

@@ -6,7 +6,7 @@
 * https://github.com/hexojs/hexo/pull/3690
 */
 
-function cssHelper (...args) {
+hexo.extend.helper.register('addCss', (...args) => {
   let result = '\n'
   let items = args
 
@@ -29,6 +29,4 @@ function cssHelper (...args) {
     }
   })
   return result
-}
-
-hexo.extend.helper.register('addCss', cssHelper)
+})

scripts/addJs.js

@@ -6,30 +6,28 @@
 * https://github.com/hexojs/hexo/pull/3681
 */
 
-function jsHelper (...args) {
-  let result = '\n';
-  let items = args;
+hexo.extend.helper.register('addJs', (...args) => {
+  let result = '\n'
+  let items = args
 
   if (!Array.isArray(args)) {
-    items = [args];
+    items = [args]
   }
 
   items.forEach(item => {
     // Old syntax
     if (typeof item === 'string' || item instanceof String) {
-      result += `<script src="${item}"></script>\n`;
+      result += `<script src="${item}"></script>\n`
     } else {
       // New syntax
-      let tmpResult = '<script';
+      let tmpResult = '<script'
       for (const attribute in item) {
-        if (item[attribute] === true) tmpResult += ' ' + attribute;
-        else tmpResult += ` ${attribute}="${item[attribute]}"`;
+        if (item[attribute] === true) tmpResult += ' ' + attribute
+        else tmpResult += ` ${attribute}="${item[attribute]}"`
       }
-      tmpResult += '></script>\n';
-      result += tmpResult;
+      tmpResult += '></script>\n'
+      result += tmpResult
     }
-  });
-  return result;
-}
-
-hexo.extend.helper.register('addJs', jsHelper)
+  })
+  return result
+})

scripts/link.js

@@ -9,11 +9,13 @@
 
 const { htmlTag } = require('hexo-util')
 
-function linkHelper (path, text) {
+hexo.extend.helper.register('link', (path, text) => {
+  const urlFor = hexo.extend.helper.get('url_for').bind(hexo)
+
   if (!text) text = path.replace(/^https?:\/\/|\/$/g, '')
 
   const attrs = Object.assign({
-    href: this.url_for(path)
+    href: urlFor(path)
   })
 
   if (attrs.class && Array.isArray(attrs.class)) {
@@ -21,6 +23,4 @@ function linkHelper (path, text) {
   }
 
   return htmlTag('a', attrs, text)
-}
-
-hexo.extend.helper.register('link', linkHelper)
+})