fix: replace static whatsapp-rust-bridge imports with lazy dynamic loading

The whatsapp-rust-bridge package contains a top-level await on an inline
WASM binary, which propagates through the ESM graph and causes
ERR_REQUIRE_ASYNC_MODULE when CJS consumers try to require() this package.

Replace all static imports from whatsapp-rust-bridge with a lazy-loading
bridge module (wasm-bridge.ts) that uses import().then() instead of
top-level await, keeping the dependency out of the static ESM graph.

https://claude.ai/code/session_01XaA7GwNaB6azTHFYQ8WEpB

src/Utils/chat-utils.ts

@@ -19,7 +19,7 @@ import {
 	type MessageLabelAssociation
 } from '../Types/LabelAssociation'
 import { type BinaryNode, getBinaryNodeChild, getBinaryNodeChildren, isJidGroup, jidNormalizedUser } from '../WABinary'
-import { expandAppStateKeys } from 'whatsapp-rust-bridge'
+import { expandAppStateKeys } from './wasm-bridge'
 import { aesDecrypt, aesEncrypt, hmacSign } from './crypto'
 import { toNumber } from './generics'
 import type { ILogger } from './logger'
@@ -102,7 +102,7 @@ const makeLtHashGenerator = ({ indexValueMap, hash }: Pick<LTHashState, 'hash' |
 			}
 		},
 		finish: () => {
-			const result = LT_HASH_ANTI_TAMPERING.subtractThenAdd(new Uint8Array(hash), addBuffs, subBuffs)
+			const result = LT_HASH_ANTI_TAMPERING().subtractThenAdd(new Uint8Array(hash), addBuffs, subBuffs)
 
 			return {
 				hash: Buffer.from(result),

src/Utils/crypto.ts

@@ -118,7 +118,7 @@ export function sha256(buffer: Buffer) {
 	return createHash('sha256').update(buffer).digest()
 }
 
-export { hkdf, md5 } from 'whatsapp-rust-bridge'
+export { hkdf, md5 } from './wasm-bridge'
 
 export async function derivePairingCodeKey(pairingCode: string, salt: Buffer): Promise<Buffer> {
 	// Convert inputs to formats Web Crypto API can work with

src/Utils/index.ts

@@ -9,6 +9,7 @@ export * from './noise-handler'
 export * from './history'
 export * from './chat-utils'
 export * from './lt-hash'
+export { wasmBridgeReady } from './wasm-bridge'
 export * from './auth-utils'
 export * from './use-multi-file-auth-state'
 export * from './link-preview'

src/Utils/lt-hash.ts

@@ -1,3 +1,3 @@
-import { LTHashAntiTampering } from 'whatsapp-rust-bridge'
+import { getLTHashAntiTampering } from './wasm-bridge'
 
-export const LT_HASH_ANTI_TAMPERING = new LTHashAntiTampering()
+export { getLTHashAntiTampering as LT_HASH_ANTI_TAMPERING }

src/Utils/wasm-bridge.ts

@@ -0,0 +1,40 @@
+type WasmBridgeModule = typeof import('whatsapp-rust-bridge')
+
+let _bridge: WasmBridgeModule | undefined
+
+// Start loading eagerly using .then() instead of top-level await.
+// This prevents the whatsapp-rust-bridge top-level await from propagating
+// through the ESM graph, which would break CJS require() consumers.
+const _bridgeReady = import('whatsapp-rust-bridge').then(m => {
+	_bridge = m
+	return m
+})
+
+export { _bridgeReady as wasmBridgeReady }
+
+function getBridge(): WasmBridgeModule {
+	if (!_bridge) {
+		throw new Error(
+			'whatsapp-rust-bridge not yet loaded. ' +
+			'Ensure async operations have started before calling crypto functions.'
+		)
+	}
+
+	return _bridge
+}
+
+export const hkdf: WasmBridgeModule['hkdf'] = (...args) => getBridge().hkdf(...args)
+
+export const md5: WasmBridgeModule['md5'] = (...args) => getBridge().md5(...args)
+
+export const expandAppStateKeys: WasmBridgeModule['expandAppStateKeys'] = (...args) => getBridge().expandAppStateKeys(...args)
+
+let _ltHash: InstanceType<WasmBridgeModule['LTHashAntiTampering']> | undefined
+
+export function getLTHashAntiTampering(): InstanceType<WasmBridgeModule['LTHashAntiTampering']> {
+	if (!_ltHash) {
+		_ltHash = new (getBridge().LTHashAntiTampering)()
+	}
+
+	return _ltHash
+}