feat: Rework sync method. #100

Author: yauhenipakala

README.md

@@ -106,6 +106,10 @@ hljs.initLineNumbersOnLoad({
 hljs.lineNumbersBlock(myCodeBlock, myOptions);
 ```
 
+```js
+hljs.lineNumbersBlockSync(myCodeBlock, myOptions);
+```
+
 ```js
 hljs.lineNumbersValue(myCodeBlock, myOptions);
 ```

src/highlightjs-line-numbers.js

@@ -14,8 +14,8 @@
     if (w.hljs) {
         w.hljs.initLineNumbersOnLoad = initLineNumbersOnLoad;
         w.hljs.lineNumbersBlock = lineNumbersBlock;
+        w.hljs.lineNumbersBlockSync = lineNumbersBlockSync;
         w.hljs.lineNumbersValue = lineNumbersValue;
-        w.hljs.lineNumbersInternal = lineNumbersInternal;
 
         addStyles();
     } else {
@@ -182,6 +182,12 @@
         });
     }
 
+    function lineNumbersBlockSync (element, options) {
+        if (typeof element !== 'object') return;
+
+        element.innerHTML = lineNumbersInternal(element, options);
+    }
+
     function lineNumbersValue (value, options) {
         if (typeof value !== 'string') return;