fix: use crypto.subtle polyfill instead of custom middleware

Replace the custom static-function-middleware (which depended on internal
packages @tanstack/start-client-core and seroval that aren't hoisted in
bun) with a lightweight crypto.subtle polyfill. This allows the original
@tanstack/start-static-server-functions middleware to work on HTTP.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: pescn

src/lib/crypto-polyfill.ts

@@ -0,0 +1,91 @@
+// Polyfill crypto.subtle.digest for non-secure contexts (HTTP).
+// crypto.subtle is only available in secure contexts (HTTPS/localhost).
+// The staticFunctionMiddleware from @tanstack/start-static-server-functions
+// uses crypto.subtle.digest('SHA-1', ...) which fails on HTTP.
+
+function sha1(buffer: Uint8Array): ArrayBuffer {
+  const rotl = (n: number, s: number) => (n << s) | (n >>> (32 - s));
+
+  let h0 = 0x67452301;
+  let h1 = 0xefcdab89;
+  let h2 = 0x98badcfe;
+  let h3 = 0x10325476;
+  let h4 = 0xc3d2e1f0;
+
+  const msgLen = buffer.length;
+  const bitLen = msgLen * 8;
+  const paddingLen = (((55 - (msgLen % 64)) + 64) % 64) + 1;
+  const padded = new Uint8Array(msgLen + paddingLen + 8);
+  padded.set(buffer);
+  padded[msgLen] = 0x80;
+
+  const view = new DataView(padded.buffer);
+  view.setUint32(padded.length - 4, bitLen, false);
+
+  const w = new Int32Array(80);
+  for (let offset = 0; offset < padded.length; offset += 64) {
+    for (let i = 0; i < 16; i++) {
+      w[i] = view.getInt32(offset + i * 4, false);
+    }
+    for (let i = 16; i < 80; i++) {
+      w[i] = rotl(w[i - 3]! ^ w[i - 8]! ^ w[i - 14]! ^ w[i - 16]!, 1);
+    }
+
+    let a = h0,
+      b = h1,
+      c = h2,
+      d = h3,
+      e = h4;
+
+    for (let i = 0; i < 80; i++) {
+      let f: number, k: number;
+      if (i < 20) {
+        f = (b & c) | (~b & d);
+        k = 0x5a827999;
+      } else if (i < 40) {
+        f = b ^ c ^ d;
+        k = 0x6ed9eba1;
+      } else if (i < 60) {
+        f = (b & c) | (b & d) | (c & d);
+        k = 0x8f1bbcdc;
+      } else {
+        f = b ^ c ^ d;
+        k = 0xca62c1d6;
+      }
+
+      const temp = (rotl(a, 5) + f + e + k + w[i]!) | 0;
+      e = d;
+      d = c;
+      c = rotl(b, 30);
+      b = a;
+      a = temp;
+    }
+
+    h0 = (h0 + a) | 0;
+    h1 = (h1 + b) | 0;
+    h2 = (h2 + c) | 0;
+    h3 = (h3 + d) | 0;
+    h4 = (h4 + e) | 0;
+  }
+
+  const result = new ArrayBuffer(20);
+  const resultView = new DataView(result);
+  resultView.setUint32(0, h0, false);
+  resultView.setUint32(4, h1, false);
+  resultView.setUint32(8, h2, false);
+  resultView.setUint32(12, h3, false);
+  resultView.setUint32(16, h4, false);
+  return result;
+}
+
+if (typeof globalThis.crypto !== 'undefined' && !globalThis.crypto.subtle) {
+  (globalThis.crypto as any).subtle = {
+    async digest(_algorithm: string, data: BufferSource): Promise<ArrayBuffer> {
+      const buffer =
+        data instanceof ArrayBuffer
+          ? new Uint8Array(data)
+          : new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
+      return sha1(buffer);
+    },
+  };
+}

src/lib/static-function-middleware.ts

@@ -6,7 +6,8 @@ import browserCollections from 'fumadocs-mdx:collections/browser';
 import { DocsBody, DocsDescription, DocsPage, DocsTitle } from 'fumadocs-ui/layouts/docs/page';
 import defaultMdxComponents from 'fumadocs-ui/mdx';
 import { baseOptions } from '@/lib/layout.shared';
-import { staticFunctionMiddleware } from '@/lib/static-function-middleware';
+import '@/lib/crypto-polyfill';
+import { staticFunctionMiddleware } from '@tanstack/start-static-server-functions';
 import { useFumadocsLoader } from 'fumadocs-core/source/client';
 import { Suspense } from 'react';
 import { ServerUrl, ApiKeyLink, InlineCode, ConfigCode, CodeKeyword, CodeString, CodeComment, CodeLine } from '@/components/mdx';

src/routes/$lang/$.tsx

@@ -6,7 +6,8 @@ import browserCollections from 'fumadocs-mdx:collections/browser';
 import { DocsBody, DocsDescription, DocsPage, DocsTitle } from 'fumadocs-ui/layouts/docs/page';
 import defaultMdxComponents from 'fumadocs-ui/mdx';
 import { baseOptions } from '@/lib/layout.shared';
-import { staticFunctionMiddleware } from '@/lib/static-function-middleware';
+import '@/lib/crypto-polyfill';
+import { staticFunctionMiddleware } from '@tanstack/start-static-server-functions';
 import { useFumadocsLoader } from 'fumadocs-core/source/client';
 import { Suspense } from 'react';
 import { ServerUrl, ApiKeyLink, InlineCode } from '@/components/mdx';