Use TypeScript syntax highlight for TypeScript code (#7988)

diff --git a/docs/docs/developers/charts.md b/docs/docs/developers/charts.md
index 1382ed09c74207f65d1bea380237b1a43fc434ef..b9d1b6f880d57578a78189f13ae9508b7d2a9366 100644 (file)
--- a/docs/docs/developers/charts.md
+++ b/docs/docs/developers/charts.md
@@ -159,7 +159,7 @@ When adding a new chart type, `IChartTypeRegistry` must contains the declaration
 
 For example, to provide typings for a new chart type that extends from a bubble chart, you would add a `.d.ts` containing:
 
-```javascript
+```ts
 import { IChartTypeRegistry } from 'chart.js'
 
 declare module 'chart.js' {