chore: add crsPath option

Author: saleel

web-starter/web/nextjs/pages/api/verify.ts

@@ -1,5 +1,5 @@
 import type { NextApiRequest, NextApiResponse } from 'next';
-import { UltraHonkBackend } from '@aztec/bb.js';
+import { UltraHonkBackend, BarretenbergVerifier } from '@aztec/bb.js';
 import { promises as fs } from 'fs';
 import path from 'path';
 
@@ -12,7 +12,13 @@ async function initializeCircuit() {
     const circuitPath = path.resolve(process.cwd(), '../../circuits/target/noir_uh_starter.json');
     const circuitData = await fs.readFile(circuitPath, 'utf-8');
     circuit = JSON.parse(circuitData);
-    honk = new UltraHonkBackend(circuit.bytecode, { threads: 8 });
+    honk = new UltraHonkBackend(circuit.bytecode, { 
+      threads: 8,
+
+      // By default, bb.js downloads CRS files to ~/.bb-crs. For serverless environments where 
+      // this path isn't writable, configure an alternate path (e.g. /tmp) using crsPath option
+      // crsPath: `/tmp`
+    });
   }
 }