Lexical API: Added content module, testing and documented

resources/js/wysiwyg/api/content.ts

@@ -0,0 +1,26 @@
+import {EditorUiContext} from "../ui/framework/core";
+import {appendHtmlToEditor, insertHtmlIntoEditor, prependHtmlToEditor} from "../utils/actions";
+
+
+export class EditorApiContentModule {
+    readonly #context: EditorUiContext;
+
+    constructor(context: EditorUiContext) {
+        this.#context = context;
+    }
+
+    insertHtml(html: string, position: string = 'selection'): void {
+        const validPositions = ['start', 'end', 'selection'];
+        if (!validPositions.includes(position)) {
+            throw new Error(`Invalid position: ${position}. Valid positions are: ${validPositions.join(', ')}`);
+        }
+
+        if (position === 'start') {
+            prependHtmlToEditor(this.#context.editor, html);
+        } else if (position === 'end') {
+            appendHtmlToEditor(this.#context.editor, html);
+        } else {
+            insertHtmlIntoEditor(this.#context.editor, html);
+        }
+    }
+}