Function isErrorWithMessage

isErrorWithMessage(error: unknown): error is { message: string }
Type guard to check if an error has a message property. Use this to safely narrow unknown errors in catch blocks.
Parameters
- error: unknown
  The error value (typically from a catch block)
Returns error is { message: string }
True if the error has a string message property
Example
```
try {
  await riskyOperation();
} catch (error) {
  if (isErrorWithMessage(error)) {
    console.error(error.message); // TypeScript knows error has message
  }
}
```