feat: add Marked instance

docs/INDEX.md

@@ -37,7 +37,7 @@ DOMPurify.sanitize(marked.parse(`<img src="x" onerror="alert('not happening')">`
 **⚠️ Input: special ZERO WIDTH unicode characters (for example `\uFEFF`) might interfere with parsing. Some text editors add them at the start of the file (see: [#2139](https://github.com/markedjs/marked/issues/2139)).**
 
 ```js
-// remove the most common zerowidth characters from the start of the file 
+// remove the most common zerowidth characters from the start of the file
 marked.parse(
   contents.replace(/^[\u200B\u200C\u200D\u200E\u200F\uFEFF]/,"")
 )
@@ -121,7 +121,7 @@ By supporting the above Markdown flavors, it's possible that Marked can help you
 
 <h2 id="tools">List of Tools Using Marked</h2>
 
-We actively support the usability of Marked in super-fast markdown transformation, some of Tools using `Marked` for single-page creations are 
+We actively support the usability of Marked in super-fast markdown transformation, some of Tools using `Marked` for single-page creations are
 
 | Tools                                                               |                  Description                                               |
 | :-----------------------------------------------------------------  | :------------------------------------------------------------------------  |

docs/USING_ADVANCED.md

@@ -1,3 +1,23 @@
+## Marked instance
+
+By default marked stores options and extensions in the global scope. In node js when you import marked into two scripts and change the options in one script the options will be changed in the other script.
+
+You can create an instance of marked to keep options and extensions locally scoped.
+
+```js
+import { Marked } from 'marked';
+const marked = new Marked([...useArgs]);
+```
+
+```js
+import { marked } from 'marked';
+const myMarked = new marked.Instance([...useArgs]);
+```
+
+|Argument                 |Type   |Notes                                                                  |
+|:------------------------|:------|:----------------------------------------------------------------------|
+|[useArgs](/using_pro#use)|`Array`|The same arguments that can be passed to [`marked.use`](/using_pro#use)|
+
 ## The `parse` function
 
 ```js