feat: make og images an emitter to properly await image generation (#1826)

* checkpoint

* make emitters async generators

* fix

* custom font spec

* replace spinner, use disk cache for fonts

* use readline instead

* make og images look nice

quartz/plugins/emitters/contentPage.tsx

@@ -94,9 +94,8 @@ export const ContentPage: QuartzEmitterPlugin<Partial<FullPageLayout>> = (userOp
 
       return graph
     },
-    async emit(ctx, content, resources): Promise<FilePath[]> {
+    async *emit(ctx, content, resources) {
       const cfg = ctx.cfg.configuration
-      const fps: FilePath[] = []
       const allFiles = content.map((c) => c[1].data)
 
       let containsIndex = false
@@ -118,14 +117,12 @@ export const ContentPage: QuartzEmitterPlugin<Partial<FullPageLayout>> = (userOp
         }
 
         const content = renderPage(cfg, slug, componentData, opts, externalResources)
-        const fp = await write({
+        yield write({
           ctx,
           content,
           slug,
           ext: ".html",
         })
-
-        fps.push(fp)
       }
 
       if (!containsIndex && !ctx.argv.fastRebuild) {
@@ -135,8 +132,6 @@ export const ContentPage: QuartzEmitterPlugin<Partial<FullPageLayout>> = (userOp
           ),
         )
       }
-
-      return fps
     },
   }
 }