kibana-riya/src/ui/public/agg_response/point_series/_init_y_axis.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

import _ from 'lodash';
export default function PointSeriesInitYAxis() {

  return function initYAxis(chart) {
    let y = chart.aspects.y;
    let x = chart.aspects.x;

    if (_.isArray(y)) {
      // TODO: vis option should allow choosing this format
      chart.yAxisFormatter = y[0].agg.fieldFormatter();
      chart.yAxisLabel = ''; // use the legend
    } else {
      chart.yAxisFormatter = y.agg.fieldFormatter();
      chart.yAxisLabel = y.col.title;
    }

    let xAggOutput = x.agg.write();
    chart.yScale = xAggOutput.metricScale || null;
  };
};