Allow individual chart controllers to opt-in to the decimation plugin

src/controllers/controller.line.js

@@ -6,8 +6,9 @@ import {_lookupByKey} from '../helpers/helpers.collection';
 export default class LineController extends DatasetController {
 
   initialize() {
-    this.enableOptionSharing = true;
     super.initialize();
+    this.enableOptionSharing = true;
+    this.supportsDecimation = true;
   }
 
   update(mode) {

src/core/core.datasetController.js

@@ -249,6 +249,7 @@ export default class DatasetController {
     this.linkScales();
     meta._stacked = isStacked(meta.vScale, meta);
     this.addElements();
+    this.supportsDecimation = false;
   }
 
   updateIndex(datasetIndex) {

src/plugins/plugin.decimation.js

@@ -217,7 +217,7 @@ export default {
         return;
       }
 
-      if (meta.type !== 'line') {
+      if (!meta.controller.supportsDecimation) {
         // Only line datasets are supported
         return;
       }

types/index.esm.d.ts

@@ -576,6 +576,10 @@ export class DatasetController<
   readonly index: number;
   readonly _cachedMeta: ChartMeta<TElement, TDatasetElement, TType>;
   enableOptionSharing: boolean;
+  // If true, the controller supports the decimation
+  // plugin. Defaults to `false` for all controllers
+  // except the LineController
+  supportsDecimation: boolean;
 
   linkScales(): void;
   getAllParsedValues(scale: Scale): number[];