fix(types): resolve all TypeScript compilation errors from non-null assertion removal

Fixes:
- chats.ts: revert encodeResult/initial to ! (guaranteed by callback assignment)
- groups.ts: fix operator precedence with ?? (wrap +attrs in parens), fix groupId type
- messages-recv.ts: extract messageKey.id to local const with fallback
- socket.ts: revert onClose! (guaranteed by synchronous callback assignment)
- event-buffer.ts: add 'notify' fallback for MessageUpsertType
- messages.ts: add filePath const after null guard, fix contextInfo type assertion
- noise-handler.ts: restore array index ! (guaranteed by length check)

Build now compiles with zero new errors.

https://claude.ai/code/session_01E2cfX1N3sJgCJBTvzGazSG

src/Socket/chats.ts

@@ -886,8 +886,8 @@ export const makeChatsSocket = (config: SocketConfig) => {
 			const { onMutation } = newAppStateChunkHandler(false)
 			const { mutationMap } = await decodePatches(
 				name,
-				[{ ...encodeResult?.patch, version: { version: encodeResult?.state?.version } }],
-				initial ?? { version: 0, hash: Buffer.alloc(0), indexValueMap: {} },
+				[{ ...encodeResult!.patch, version: { version: encodeResult!.state.version } }],
+				initial!,
 				getAppStateSyncKey,
 				config.options,
 				undefined,

src/Socket/groups.ts

@@ -316,7 +316,7 @@ export const extractGroupMetadata = (result: BinaryNode) => {
 		descId = descChild.attrs.id
 	}
 
-	const groupId = (group.attrs.id ?? '').includes('@') ? group.attrs.id : jidEncode(group.attrs.id ?? '', 'g.us')
+	const groupId = (group.attrs.id ?? '').includes('@') ? (group.attrs.id ?? '') : jidEncode(group.attrs.id ?? '', 'g.us')
 	const eph = getBinaryNodeChild(group, 'ephemeral')?.attrs.expiration
 	const memberAddMode = getBinaryNodeChildString(group, 'member_add_mode') === 'all_member_add'
 	const metadata: GroupMetadata = {
@@ -326,9 +326,9 @@ export const extractGroupMetadata = (result: BinaryNode) => {
 		subject: group.attrs.subject ?? '',
 		subjectOwner: group.attrs.s_o,
 		subjectOwnerPn: group.attrs.s_o_pn,
-		subjectTime: +group.attrs.s_t ?? '0',
+		subjectTime: +(group.attrs.s_t ?? '0'),
 		size: group.attrs.size ? +group.attrs.size : getBinaryNodeChildren(group, 'participant').length,
-		creation: +group.attrs.creation ?? '0',
+		creation: +(group.attrs.creation ?? '0'),
 		owner: group.attrs.creator ? jidNormalizedUser(group.attrs.creator) : undefined,
 		ownerPn: group.attrs.creator_pn ? jidNormalizedUser(group.attrs.creator_pn) : undefined,
 		owner_country_code: group.attrs.creator_country_code,

src/Socket/messages-recv.ts

@@ -156,16 +156,17 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 			throw new Boom('Not authenticated')
 		}
 
-		if (await placeholderResendCache.get(messageKey?.id)) {
+		const msgId = messageKey?.id ?? ''
+		if (await placeholderResendCache.get(msgId)) {
 			logger.debug({ messageKey }, 'already requested resend')
 			return
 		} else {
-			await placeholderResendCache.set(messageKey?.id, true)
+			await placeholderResendCache.set(msgId, true)
 		}
 
 		await delay(2000)
 
-		if (!(await placeholderResendCache.get(messageKey?.id))) {
+		if (!(await placeholderResendCache.get(msgId))) {
 			logger.debug({ messageKey }, 'message received while resend requested')
 			return 'RESOLVED'
 		}
@@ -180,9 +181,9 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 		}
 
 		setTimeout(async () => {
-			if (await placeholderResendCache.get(messageKey?.id)) {
+			if (await placeholderResendCache.get(msgId)) {
 				logger.debug({ messageKey }, 'PDO message without response after 8 seconds. Phone possibly offline')
-				await placeholderResendCache.del(messageKey?.id)
+				await placeholderResendCache.del(msgId)
 			}
 		}, 8_000)
 

src/Socket/socket.ts

@@ -552,11 +552,7 @@ export const makeSocket = (config: SocketConfig) => {
 		})
 
 		if (sendMsg) {
-			if (!onClose) {
-				throw new Error('onClose handler not initialized')
-			}
-
-			sendRawMessage(sendMsg).catch(onClose)
+				sendRawMessage(sendMsg).catch(onClose!)
 		}
 
 		return result