feat: minify js scripts (closes #655) (#657)

quartz/plugins/emitters/componentResources.ts

@@ -14,6 +14,7 @@ import { StaticResources } from "../../util/resources"
 import { QuartzComponent } from "../../components/types"
 import { googleFontHref, joinStyles } from "../../util/theme"
 import { Features, transform } from "lightningcss"
+import { transform as transpile } from "esbuild"
 
 type ComponentResources = {
   css: string[]
@@ -56,9 +57,16 @@ function getComponentResources(ctx: BuildCtx): ComponentResources {
   }
 }
 
-function joinScripts(scripts: string[]): string {
+async function joinScripts(scripts: string[]): Promise<string> {
   // wrap with iife to prevent scope collision
-  return scripts.map((script) => `(function () {${script}})();`).join("\n")
+  const script = scripts.map((script) => `(function () {${script}})();`).join("\n")
+
+  // minify with esbuild
+  const res = await transpile(script, {
+    minify: true,
+  })
+
+  return res.code
 }
 
 function addGlobalPageResources(
@@ -165,8 +173,11 @@ export const ComponentResources: QuartzEmitterPlugin<Options> = (opts?: Partial<
       addGlobalPageResources(ctx, resources, componentResources)
 
       const stylesheet = joinStyles(ctx.cfg.configuration.theme, ...componentResources.css, styles)
-      const prescript = joinScripts(componentResources.beforeDOMLoaded)
-      const postscript = joinScripts(componentResources.afterDOMLoaded)
+      const [prescript, postscript] = await Promise.all([
+        joinScripts(componentResources.beforeDOMLoaded),
+        joinScripts(componentResources.afterDOMLoaded),
+      ])
+
       const fps = await Promise.all([
         emit({
           slug: "index" as FullSlug,