```ts
/**
 * Divides two numbers safely.
 *
 * @param a The dividend.
 * @param b The divisor.
 * @returns The result of dividing a by b.
 */
export function safeDivide(a: number, b: number): number {
  if (typeof a !== 'number' || typeof b !== 'number') {
    throw new Error('Both arguments must be numbers.');
  }
  if (b === 0) {
    throw new Error('Division by zero is not allowed.');
  }
  return a / b;
}
```