configure() {
    const config = this.chart.config;
    const scopeKeys = config.datasetScopeKeys(this._type);
    const scopes = config.getOptionScopes(this.getDataset(), scopeKeys, true);
    this.options = config.createResolver(scopes, this.getContext());
    this._parsing = this.options.parsing;
    this._cachedDataOpts = {};
  }
Merges user-supplied and default dataset-level options
@private