chartjs/chartjs-plugin-datalabels

import {isNullOrUndef, isObject} from 'chart.js/helpers';

var formatter = function(value) {
  if (isNullOrUndef(value)) {
    return null;
  }

  var label = value;
  var keys, klen, k;
  if (isObject(value)) {
    if (!isNullOrUndef(value.label)) {
      label = value.label;
    } else if (!isNullOrUndef(value.r)) {
      label = value.r;
    } else {
      label = '';
      keys = Object.keys(value);
      for (k = 0, klen = keys.length; k < klen; ++k) {
        label += (k !== 0 ? ', ' : '') + keys[k] + ': ' + value[keys[k]];
      }
    }
  }

  return '' + label;
};

/**
 * IMPORTANT: make sure to also update tests and TypeScript definition
 * files (`/test/specs/defaults.spec.js` and `/types/options.d.ts`)
 */

export default {
  align: 'center',
  anchor: 'center',
  backgroundColor: null,
  borderColor: null,
  borderRadius: 0,
  borderWidth: 0,
  clamp: false,
  clip: false,
  color: undefined,
  display: true,
  font: {
    family: undefined,
    lineHeight: 1.2,
    size: undefined,
    style: undefined,
    weight: null
  },
  formatter: formatter,
  labels: undefined,
  listeners: {},
  offset: 4,
  opacity: 1,
  padding: {
    top: 4,
    right: 4,
    bottom: 4,
    left: 4
  },
  rotation: 0,
  textAlign: 'start',
  textStrokeColor: undefined,
  textStrokeWidth: 0,
  textShadowBlur: 0,
  textShadowColor: undefined
};