fix: resolve all pre-existing tsc --noEmit errors (10 errors across 5 files)

- folk-map-viewer.ts: remove explicit return type, let TS infer
- test-x402.ts: cast account as any (test script, readContract unused)
- key-derivation.ts: cast Uint8Array at WebCrypto boundaries (BufferSource/ArrayBuffer)
- wallet-store.ts: cast .buffer as ArrayBuffer
- webauthn.ts: cast PRF output as ArrayBuffer | undefined

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

modules/rmaps/components/folk-map-viewer.ts

@@ -99,7 +99,7 @@ class FolkMapViewer extends HTMLElement {
 		this.renderDemo();
 	}
 
-	private getFilteredProviders(): { provider: typeof this.providers[0]; index: number }[] {
+	private getFilteredProviders() {
 		if (!this.searchQuery.trim()) return this.providers.map((p, i) => ({ provider: p, index: i }));
 		const q = this.searchQuery.toLowerCase();
 		return this.providers.map((p, i) => ({ provider: p, index: i }))

scripts/test-x402.ts

@@ -59,7 +59,7 @@ async function main() {
 	console.log("  Wallet:", account.address);
 
 	const client = new x402Client();
-	client.register("eip155:84532", new ExactEvmScheme(account));
+	client.register("eip155:84532", new ExactEvmScheme(account as any));
 
 	const paidFetch = wrapFetchWithPayment(fetch, client);
 

src/encryptid/key-derivation.ts

@@ -115,7 +115,7 @@ export class EncryptIDKeyManager {
     const masterKeyMaterial = await crypto.subtle.deriveBits(
       {
         name: 'PBKDF2',
-        salt: salt,
+        salt: salt as BufferSource,
         iterations: 600000,
         hash: 'SHA-256',
       },
@@ -296,7 +296,7 @@ export class EncryptIDKeyManager {
     // For now, we'll create a placeholder using the seed hash
     // TODO: Use @noble/ed25519 for proper Ed25519 key generation
 
-    const publicKeyHash = await crypto.subtle.digest('SHA-256', seed);
+    const publicKeyHash = await crypto.subtle.digest('SHA-256', seed as BufferSource);
     const publicKeyBytes = new Uint8Array(publicKeyHash).slice(0, 32);
 
     // Multicodec prefix for Ed25519 public key: 0xed01
@@ -369,7 +369,7 @@ export async function encryptData(
   if (typeof data === 'string') {
     plaintext = new TextEncoder().encode(data).buffer;
   } else if (data instanceof Uint8Array) {
-    plaintext = data.buffer;
+    plaintext = data.buffer as ArrayBuffer;
   } else {
     plaintext = data;
   }
@@ -400,7 +400,7 @@ export async function decryptData(
   return crypto.subtle.decrypt(
     {
       name: 'AES-GCM',
-      iv: encrypted.iv,
+      iv: encrypted.iv as BufferSource,
     },
     key,
     encrypted.ciphertext
@@ -434,7 +434,7 @@ export async function signData(
   if (typeof data === 'string') {
     dataBuffer = new TextEncoder().encode(data).buffer;
   } else if (data instanceof Uint8Array) {
-    dataBuffer = data.buffer;
+    dataBuffer = data.buffer as ArrayBuffer;
   } else {
     dataBuffer = data;
   }

src/encryptid/wallet-store.ts

@@ -256,7 +256,7 @@ export class WalletStore {
 
     const blob: PersistedBlob = {
       c: bufferToBase64url(encrypted.ciphertext),
-      iv: bufferToBase64url(encrypted.iv.buffer),
+      iv: bufferToBase64url(encrypted.iv.buffer as ArrayBuffer),
     };
 
     try {

src/encryptid/webauthn.ts

@@ -329,7 +329,7 @@ export async function authenticatePasskey(
     userId: response.userHandle
       ? bufferToBase64url(response.userHandle)
       : '',
-    prfOutput: prfOutput,
+    prfOutput: prfOutput as ArrayBuffer | undefined,
     signature: response.signature,
     authenticatorData: response.authenticatorData,
   };
@@ -426,7 +426,7 @@ export async function startConditionalUI(
       userId: response.userHandle
         ? bufferToBase64url(response.userHandle)
         : '',
-      prfOutput: prfResults?.first,
+      prfOutput: prfResults?.first as ArrayBuffer | undefined,
       signature: response.signature,
       authenticatorData: response.authenticatorData,
     };