// get current editor state 

    const currentContent = editorState.getCurrentContent();

​

 // create new selection state where focus is at the end

    const blockMap = currentContent.getBlockMap();

    const key = blockMap.last().getKey();

    const length = blockMap.last().getLength();

    const selection = new SelectionState({

        anchorKey: key,

        anchorOffset: length,

        focusKey: key,

        focusOffset: length,

      });

​

   //insert text at the selection created above 

    const textWithInsert = Modifier.insertText(currentContent, selection, 'text to be inserted', null);

    const editorWithInsert = EditorState.push(editorState, textWithInsert, 'insert-characters');

​

    //also focuses cursor at the end of the editor 

    const newEditorState = EditorState.moveSelectionToEnd(editorWithInsert, textWithInsert.getSelectionAfter());

    setEditorState(newEditorState);