feat: add signMessage utility with multi-chain support

README.md

@@ -936,6 +936,18 @@ The optional parameters that the object takes in are: value, contractAbi, gas pr
 }
 ```
 
+### Signing Message
+
+```javascript
+// EVM (Ethereum, BSC, etc.)
+const evmSignature = await signMessage("hello", "0xYourPrivateKey", "evm");
+
+// Solana
+
+const solanaKey = new Uint8Array([...]); // 64-byte Key
+
+const solanaSignature = await signMessage("hello", solanaKey, "solana");
+```
 ### Want to contribute?
 
 Contributions are welcome! Kindly refer to the [contribution guidelines](CONTRIBUTING.md).

jest.config.js

@@ -11,4 +11,4 @@ const config = {
   setupFiles: ['./jest.setup.js'],
 };
 
-module.exports = config;
+module.exports = config; 

jest.setup.js

@@ -1,4 +1,8 @@
 const crypto = require('crypto');
+const { TextEncoder, TextDecoder } = require('util');
+
+global.TextEncoder = TextEncoder;
+global.TextDecoder = TextDecoder; 
 
 Object.defineProperty(global, 'crypto', {
   value: {