Expose addCodeLanguage function

Author: cyanzhong

README.md

@@ -17,7 +17,7 @@ Add `markedit-api` to your (TypeScript) project's devDependencies:
 ```json
 {
   "devDependencies": {
-    "markedit-api": "https://github.com/MarkEdit-app/MarkEdit-api#v0.4.0"
+    "markedit-api": "https://github.com/MarkEdit-app/MarkEdit-api#v0.5.0"
   }
 }
 ```
@@ -46,6 +46,8 @@ interface MarkEdit {
   addExtension: (extension: Extension) => void;
   // Add a Markdown config to MarkEdit.
   addMarkdownConfig: (config: MarkdownConfig) => void;
+  // Add a language to be highlighted (in code blocks) to MarkEdit.
+  addCodeLanguage: (language: LanguageDescription) => void;
 }
 ```
 
@@ -70,6 +72,12 @@ Build [MarkdownConfig](https://github.com/lezer-parser/markdown?tab=readme-ov-fi
 MarkEdit.addMarkdownConfig(config);
 ```
 
+MarkEdit supports syntax highlighting for code blocks, you can also build your own [Language Package](https://codemirror.net/examples/lang-package/), and add it to MarkEdit with:
+
+```ts
+MarkEdit.addCodeLanguage(language);
+```
+
 > While extensions and configs can theoretically be added at any time, it is recommended that they be added immediately after loading the script.
 
 ## Building

markedit.d.ts

@@ -1,5 +1,14 @@
+/**
+ * https://github.com/MarkEdit-app/MarkEdit-api
+ *
+ * - [MarkEdit Customization Guide](https://github.com/MarkEdit-app/MarkEdit/wiki/Customization)
+ * - [Example (Markdown Table Editor)](https://github.com/MarkEdit-app/MarkEdit-mte)
+ * - [Example (Text Highlight)](https://github.com/MarkEdit-app/MarkEdit-highlight)
+ */
+
 import type { EditorView } from '@codemirror/view';
 import type { Extension } from '@codemirror/state';
+import type { LanguageDescription } from '@codemirror/language';
 import type { MarkdownConfig } from '@lezer/markdown';
 
 import type * as cmView from '@codemirror/view';
@@ -98,8 +107,17 @@ export interface MarkEdit {
    * @param config Markdown config.
    */
   addMarkdownConfig: (config: MarkdownConfig) => void;
+
+  /**
+   * Add a language to be highlighted (in code blocks) to MarkEdit.
+   * @param language The language description.
+   */
+  addCodeLanguage: (language: LanguageDescription) => void;
 }
 
+/**
+ * Abstract editor to provide convenient text editing interfaces.
+ */
 export interface TextEditable {
   /**
    * Get text of the document.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "markedit-api",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "Type definitions for the latest MakrEdit API.",
   "main": "main.ts",
   "types": "markedit.d.ts",