Add opengraph types

opengraph-io.d.ts

@@ -0,0 +1,21 @@
+// TODO @Shinigami92 2022-12-12: @Shinigami92 might add @types/opengraph-io to DefinitelyTyped
+// Or directly to the repo
+
+declare module 'opengraph-io' {
+    function opengraph(options: {
+        appId: string
+        fullRender?: boolean
+    }): {
+        getSiteInfo(url: string): Promise<{
+            hybridGraph: {
+                image: string
+            },
+            openGraph: {
+                image: {
+                    url: string
+                }
+            }
+        }>
+    }
+    export = opengraph
+}

server/api/og-image.ts

@@ -2,11 +2,17 @@ import opengraph from 'opengraph-io'
 
 // This API-Endpoint will be cached via nuxt.config.ts -> nitro.routeRules['/api/og-image'].cache.maxAge = 86400
 
-let openGraphClient: any = null
+type OpenGraphClient = ReturnType<typeof opengraph>
 
-function getOpenGraphClient(): any {
-  if (openGraphClient == null)
-    openGraphClient = opengraph({ appId: process.env.NUXT_OPENGRAPH_API, fullRender: true })
+let openGraphClient: OpenGraphClient
+
+function getOpenGraphClient(): OpenGraphClient {
+  const NUXT_OPENGRAPH_API = process.env.NUXT_OPENGRAPH_API
+  if (typeof NUXT_OPENGRAPH_API !== 'string')
+    throw new Error('Missing NUXT_OPENGRAPH_API environment variable.')
+
+  if (!openGraphClient)
+    openGraphClient = opengraph({ appId: NUXT_OPENGRAPH_API, fullRender: true })!
 
   return openGraphClient
 }