feat(docs): pass preloader settings via search

Author: wmertens

packages/docs/src/entry.ssr.tsx

@@ -1,7 +1,37 @@
 import { renderToStream, type RenderToStreamOptions } from '@builder.io/qwik/server';
 import Root from './root';
 
+// You can pass these as query parameters, as well as `preloadDebug`
+const preloaderSettings = [
+  'maxPreloads',
+  'minProbability',
+  'maxSimultaneousPreloads',
+  'minPreloadProbability',
+] as const;
+
 export default function (opts: RenderToStreamOptions) {
+  const { serverData } = opts;
+  const urlStr = serverData?.url;
+  if (urlStr) {
+    const { searchParams } = new URL(urlStr);
+    if (searchParams.size) {
+      opts = {
+        ...opts,
+        prefetchStrategy: {
+          ...opts.prefetchStrategy,
+          implementation: { ...opts.prefetchStrategy?.implementation },
+        },
+      };
+      if (searchParams.has('preloadDebug')) {
+        opts.prefetchStrategy!.implementation!.debug = true;
+      }
+      for (const type of preloaderSettings) {
+        if (searchParams.has(type)) {
+          opts.prefetchStrategy!.implementation![type] = Number(searchParams.get(type));
+        }
+      }
+    }
+  }
   return renderToStream(<Root />, {
     qwikLoader: {
       // The docs can be long so make sure to intercept events before the end of the document.