feat(favicon): add plugin to expose favicon from icon.png

quartz.config.ts

@@ -86,6 +86,7 @@ const config: QuartzConfig = {
       }),
       Plugin.Assets(),
       Plugin.Static(),
+      Plugin.Favicon(),
       Plugin.NotFoundPage(),
       // Comment out CustomOgImages to speed up build time
       Plugin.CustomOgImages(),

quartz/plugins/emitters/favicon.ts

@@ -0,0 +1,19 @@
+import sharp from "sharp";
+import { joinSegments, QUARTZ, FilePath } from "../../util/path";
+import { QuartzEmitterPlugin } from "../types";
+
+export const Favicon: QuartzEmitterPlugin = () => ({
+    name: "Favicon",
+    async *emit({ argv, cfg }) {
+        const iconPath = joinSegments(QUARTZ, "static", "icon.png")
+        const dest = joinSegments(argv.output, "favicon.ico") as FilePath
+        
+        await sharp(iconPath)
+            .resize(48, 48)
+            .toFormat("png")
+            .toFile(dest)
+
+        yield dest
+    },
+    async *partialEmit() {},
+})

quartz/plugins/emitters/index.ts

@@ -5,6 +5,7 @@ export { ContentIndex as ContentIndex } from "./contentIndex"
 export { AliasRedirects } from "./aliases"
 export { Assets } from "./assets"
 export { Static } from "./static"
+export { Favicon } from "./favicon"
 export { ComponentResources } from "./componentResources"
 export { NotFoundPage } from "./404"
 export { CNAME } from "./cname"