Add `editor.addStyle` method

src/editor/index.js

@@ -306,7 +306,6 @@ export default (config = {}) => {
     /**
      * Set style inside editor's canvas. This method overrides actual style
      * @param {Array<Object>|Object|string} style CSS string or style model
-     * @param {Object} opt the options object to be used by the [setStyle]{@link em#setStyle} method
      * @return {this}
      * @example
      * editor.setStyle('.cls{color: red}');
@@ -321,6 +320,17 @@ export default (config = {}) => {
       return this;
     },
 
+    /**
+     * Add styles to the editor
+     * @param {Array<Object>|Object|string} style CSS string or style model
+     * @returns {Array<CssRule>} Array of created CssRule instances
+     * @example
+     * editor.addStyle('.cls{color: red}');
+     */
+    addStyle(style, opts = {}) {
+      return em.addStyle(style, opts);
+    },
+
     /**
      * Returns the last selected component, if there is one
      * @return {Model}

src/editor/model/Editor.js

@@ -484,6 +484,17 @@ export default Backbone.Model.extend({
     return this;
   },
 
+  /**
+   * Add styles to the editor
+   * @param {Array<Object>|Object|string} style CSS string or style model
+   * @returns {Array<CssRule>}
+   * @private
+   */
+  addStyle(style, opts = {}) {
+    const res = this.getStyle().add(style, opts);
+    return isArray(res) ? res : [res];
+  },
+
   /**
    * Returns rules/style model from the editor's canvas
    * @return {Rules}