fix: add type comment on Chart Objects (#825) (#860)

Co-authored-by: yoooz <oor.9@outlook.com>

Author: yoooz

legacy/src/Charts.js

@@ -223,48 +223,56 @@ export function generateChart(chartId, chartType, chartController) {
  }
 }
 
+/** @type Object */
 export const Bar = /* #__PURE__ */ generateChart(
  'bar-chart',
  'bar',
  BarController
 )
 
+/** @type Object */
 export const Doughnut = /* #__PURE__ */ generateChart(
  'doughnut-chart',
  'doughnut',
  DoughnutController
 )
 
+/** @type Object */
 export const Line = /* #__PURE__ */ generateChart(
  'line-chart',
  'line',
  LineController
 )
 
+/** @type Object */
 export const Pie = /* #__PURE__ */ generateChart(
  'pie-chart',
  'pie',
  PieController
 )
 
+/** @type Object */
 export const PolarArea = /* #__PURE__ */ generateChart(
  'polar-chart',
  'polarArea',
  PolarAreaController
 )
 
+/** @type Object */
 export const Radar = /* #__PURE__ */ generateChart(
  'radar-chart',
  'radar',
  RadarController
 )
 
+/** @type Object */
 export const Bubble = /* #__PURE__ */ generateChart(
  'bubble-chart',
  'bubble',
  BubbleController
 )
 
+/** @type Object */
 export const Scatter = /* #__PURE__ */ generateChart(
  'scatter-chart',
  'scatter',