function mergeScaleConfig()

in Hands-on lab/lab-files/starter-project/NorthwindMVC/wwwroot/lib/Chart.js/chart.js [6271:6302]

• 32 lines of code
• 12 McCabe index (conditional complexity)

function mergeScaleConfig(config, options) {
  const chartDefaults = overrides[config.type] || {scales: {}};
  const configScales = options.scales || {};
  const chartIndexAxis = getIndexAxis(config.type, options);
  const firstIDs = Object.create(null);
  const scales = Object.create(null);
  Object.keys(configScales).forEach(id => {
    const scaleConf = configScales[id];
    const axis = determineAxis(id, scaleConf);
    const defaultId = getDefaultScaleIDFromAxis(axis, chartIndexAxis);
    const defaultScaleOptions = chartDefaults.scales || {};
    firstIDs[axis] = firstIDs[axis] || id;
    scales[id] = mergeIf(Object.create(null), [{axis}, scaleConf, defaultScaleOptions[axis], defaultScaleOptions[defaultId]]);
  });
  config.data.datasets.forEach(dataset => {
    const type = dataset.type || config.type;
    const indexAxis = dataset.indexAxis || getIndexAxis(type, options);
    const datasetDefaults = overrides[type] || {};
    const defaultScaleOptions = datasetDefaults.scales || {};
    Object.keys(defaultScaleOptions).forEach(defaultID => {
      const axis = getAxisFromDefaultScaleID(defaultID, indexAxis);
      const id = dataset[axis + 'AxisID'] || firstIDs[axis] || axis;
      scales[id] = scales[id] || Object.create(null);
      mergeIf(scales[id], [{axis}, configScales[id], defaultScaleOptions[defaultID]]);
    });
  });
  Object.keys(scales).forEach(key => {
    const scale = scales[key];
    mergeIf(scale, [defaults.scales[scale.type], defaults.scale]);
  });
  return scales;
}