Function hexStringToBytes

hexStringToBytes(hexStr: string): Uint8Array<ArrayBufferLike> | null
Converts a space-separated hex string to Uint8Array. Ignores extra spaces. Returns null if string contains non-hexadecimal characters or is empty.
Parameters
- hexStr: string
Returns Uint8Array<ArrayBufferLike> | null
Example
```
hexStringToBytes("25 50 44") → Uint8Array([37, 80, 68])
```
Example
```
hexStringToBytes("")         → null
```
- Defined in utils/hex.ts:140