Method _getSharedOptions

src/core/core.datasetController.js:885–892

* @todo v4, rename to getSharedOptions and remove excess functions

(start, mode)

   * @todo v4, rename to getSharedOptions and remove excess functions
   */
  _getSharedOptions(start, mode) {
    const firstOpts = this.resolveDataElementOptions(start, mode);
    const previouslySharedOptions = this._sharedOptions;
    const sharedOptions = this.getSharedOptions(firstOpts);
    const includeOptions = this.includeOptions(mode, sharedOptions) || (sharedOptions !== previouslySharedOptions);
    this.updateSharedOptions(sharedOptions, mode, firstOpts);
    return {sharedOptions, includeOptions};
  }

  /**
	 * Utility for updating an element with new properties, using animations when appropriate.