Add DocSearch by Algolia

app/modules/docsearch.tsx

@@ -0,0 +1,39 @@
+import type { DocSearchProps } from "@docsearch/react";
+import "@docsearch/css/dist/style.css";
+import "~/styles/docsearch.css";
+import { useHydrated } from "~/ui/utils";
+import { Suspense, lazy } from "react";
+
+const OriginalDocSearch = lazy(() =>
+  import("@docsearch/react").then((module) => ({
+    default: module.DocSearch,
+  }))
+);
+
+let docSearchProps = {
+  appId: "RB6LOUCOL0",
+  indexName: "reactrouter",
+  apiKey: "b50c5d7d9f4610c9785fa945fdc97476",
+} satisfies DocSearchProps;
+
+// TODO: Refactor a bit when we add Vite with css imports per component
+// This will allow us to have two versions of the component, one that has
+// the button with display: none, and the other with button styles
+export function DocSearch() {
+  let hydrated = useHydrated();
+
+  if (!hydrated) {
+    // The Algolia doc search container is hard-coded at 40px. It doesn't
+    // render anything on the server, so we get a mis-match after hydration.
+    // This placeholder prevents layout shift when the search appears.
+    return <div className="h-10" />;
+  }
+
+  return (
+    <Suspense fallback={<div className="h-10" />}>
+      <div className="animate-[fadeIn_100ms_ease-in_1]">
+        <OriginalDocSearch {...docSearchProps} />
+      </div>
+    </Suspense>
+  );
+}

app/routes/$lang.$ref.$.tsx

@@ -53,7 +53,7 @@ export const meta: MetaFunction<
     root: typeof rootLoader;
     "routes/$lang.$ref": typeof langRefLoader;
   }
-> = ({ data, matches }) => {
+> = ({ data, matches, params }) => {
   if (!data) return [{ title: "Not Found" }];
   let parentMatch = matches.find((m) => m.id === "routes/$lang.$ref");
   let parentData = parentMatch ? parentMatch.data : undefined;
@@ -100,6 +100,8 @@ export const meta: MetaFunction<
 
   return [
     ...meta,
+    { name: "docsearch:language", content: params.lang || "en" },
+    { name: "docsearch:version", content: params.ref || "v6" },
     { name: "robots", content: robots },
     { name: "googlebot", content: robots },
   ];

app/routes/$lang.$ref.tsx

@@ -31,6 +31,7 @@ import { getLatestVersion } from "~/modules/gh-docs/.server/tags";
 import { useColorScheme } from "~/modules/color-scheme/components";
 
 import docsStylesheet from "~/styles/docs.css?url";
+import { DocSearch } from "~/modules/docsearch";
 
 export let links: LinksFunction = () => {
   return [{ rel: "stylesheet", href: docsStylesheet }];
@@ -180,6 +181,7 @@ function Header() {
         <div className="flex items-center gap-2">
           <VersionSelect />
           <ColorSchemeToggle />
+          <DocSearchSection className="lg:hidden" />
         </div>
       </div>
       <VersionWarning />
@@ -209,6 +211,29 @@ function Header() {
   );
 }
 
+function DocSearchSection({ className }: { className?: string }) {
+  return (
+    <div
+      className={classNames(
+        "relative -mx-3 lg:sticky lg:top-0 lg:z-10",
+        className
+      )}
+    >
+      <div className="absolute -top-24 hidden h-24 w-full bg-white dark:bg-gray-900 lg:block" />
+      <div
+        className={classNames(
+          "relative lg:bg-white lg:dark:bg-gray-900",
+          // This hides some of the underlying text when the user scrolls to the
+          // bottom which results in the overscroll bounce
+          "before:absolute before:bottom-0 before:left-0 before:-z-10 before:hidden before:h-[200%] before:w-full before:bg-inherit lg:before:block"
+        )}
+      >
+        <DocSearch />
+      </div>
+    </div>
+  );
+}
+
 function ColorSchemeToggle() {
   let location = useLocation();
 
@@ -329,6 +354,7 @@ function NavMenuDesktop() {
         "h-[calc(100vh-var(--header-height))]"
       )}
     >
+      <DocSearchSection />
       <div className="[&_*:focus]:scroll-mt-[6rem]">
         <Menu />
       </div>

app/styles/docsearch.css

@@ -0,0 +1,58 @@
+/* this was copy/paste/modified from @docsearch/css/dist/_variables.css */
+:root {
+  &:where(.dark) {
+    --docsearch-text-color: #f5f6f7;
+    --docsearch-container-background: rgba(9, 10, 17, 0.8);
+    --docsearch-modal-background: #15172a;
+    --docsearch-modal-shadow: inset 1px 1px 0 0 #2c2e40, 0 3px 8px 0 #000309;
+    --docsearch-searchbox-background: #090a11;
+    --docsearch-searchbox-focus-background: #000;
+    --docsearch-hit-color: #bec3c9;
+    --docsearch-hit-shadow: none;
+    --docsearch-hit-background: #090a11;
+    --docsearch-key-gradient: linear-gradient(-26.5deg, #565872, #31355b);
+    --docsearch-key-shadow: inset 0 -2px 0 0 #282d55, inset 0 0 1px 1px #51577d,
+      0 2px 2px 0 rgba(3, 4, 9, 0.3);
+    --docsearch-footer-background: #1e2136;
+    --docsearch-footer-shadow: inset 0 1px 0 0 rgba(73, 76, 106, 0.5),
+      0 -4px 8px 0 rgba(0, 0, 0, 0.2);
+    --docsearch-logo-color: #fff;
+    --docsearch-muted-color: #7f8497;
+  }
+}
+
+.DocSearch-Button {
+  @apply ml-0 h-10 bg-gray-100 px-3 hover:bg-gray-200 hover:shadow-none focus:bg-gray-200 focus-visible:bg-gray-100 dark:bg-gray-800 dark:hover:bg-gray-700 dark:focus-visible:bg-gray-700;
+
+  @media screen and (min-width: theme(screens.lg)) {
+    width: 100%;
+  }
+  @media not screen and (min-width: theme(screens.lg)) {
+    @apply w-10 place-content-center px-0;
+    .DocSearch-Button-Keys,
+    .DocSearch-Button-Placeholder {
+      display: none;
+    }
+  }
+  @media print {
+    display: none;
+  }
+}
+
+.DocSearch-Button-Placeholder {
+  @apply text-sm font-normal text-black dark:text-gray-200;
+}
+
+.DocSearch-Button-Keys {
+  @apply justify-end gap-1;
+}
+
+.DocSearch-Button-Key {
+  all: unset;
+
+  @apply grid h-5 w-3.5 place-items-center rounded bg-white px-1 text-xs text-gray-600 dark:bg-gray-600 dark:text-gray-200;
+}
+
+.DocSearch-Container {
+  cursor: auto;
+}

app/ui/utils.ts

@@ -0,0 +1,12 @@
+import { useEffect, useState } from "react";
+
+let hydrating = true;
+
+export function useHydrated() {
+  let [hydrated, setHydrated] = useState(() => !hydrating);
+  useEffect(() => {
+    hydrating = false;
+    setHydrated(true);
+  }, []);
+  return hydrated;
+}