fix: scriptable example

Author: sgratzl

README.md

@@ -126,9 +126,9 @@ Chart.register(HierarchicalScale);
 
 ```sh
 npm i -g yarn
-yarn set version 2.1.0
+yarn set version berry
 cat .yarnrc_patch.yml >> .yarnrc.yml
-yarn
+yarn install
 yarn pnpify --sdk vscode
 ```
 

samples/scriptable.html

@@ -92,7 +92,7 @@
                 type: 'hierarchical',
 
                 attributes: {
-                  backgroundColor: (ctx) => {
+                  backgroundColor: () => (ctx) => {
                     const v = ctx.dataset.data[ctx.dataIndex];
                     return scale(v);
                   },

src/scale/hierarchical.ts

@@ -259,3 +259,11 @@ export class HierarchicalScale extends CategoryScale<IHierarchicalScaleOptions>
 export interface HierarchicalScaleType extends Partial<IHierarchicalScaleOptions> {
   type: 'hierarchical';
 }
+
+declare module 'chart.js' {
+  export interface CartesianScaleTypeRegistry {
+    hierarchical: {
+      options: IHierarchicalScaleOptions;
+    };
+  }
+}