docs: add faq docs on typescript (#1042)

Author: Arantiryo

website/docs/faq/docs.js

@@ -24,4 +24,8 @@ exports.docs = [
     title: 'How to fix "... is not a registered scale" error?',
     slug: '/faq/registered-scale',
   },
+  {
+    title: 'How to use react-chartjs-2 with TypeScript?',
+    slug: '/faq/typescript',
+  },
 ];

website/docs/faq/typescript.md

@@ -0,0 +1,26 @@
+---
+slug: /faq/typescript
+---
+
+# How to use react-chartjs-2 with TypeScript?
+
+TypeScript has extremely robust type inference capabilities and most of the time
+we can enjoy type safety and autocompletion without having to do any extra work.
+
+But occasionally types need to be set explicitly. They can be imported from `Chart.js`:
+
+```typescript
+import type { ChartData, ChartOptions } from 'chart.js';
+```
+
+...and then used with `options` and `data` props:
+
+```typescript
+interface LineProps {
+  options: ChartOptions<'line'>;
+  data: ChartData<'line'>;
+}
+```
+
+The generic type being passed is a `ChartType` that can be one of the following values:
+`'bar'`, `'line'`, `'scatter'`, `'bubble'`, `'pie'`, `'doughnut'`, `'polarArea'` or `'radar'`.