Method insert

src/ytype.js:1181–1183

* Inserts new content at an index. * * Important: This function expects an array of content. Not just a content * object. The reason for this "weirdness" is that inserting several elements * is very efficient when it is done as a single operation. * * @example * // Insert chara

(index, content, format)

   * @param {delta.FormattingAttributes} [format]
   */
  insert (index, content, format) {
    this.applyDelta(delta.create().retain(index).insert(/** @type {any} */ (content), format))
  }

  /**
   * Inserts new content at an index.