import { z } from 'zod';

export const StringArraySchema = z.array(z.string());

export function assertIsNumber(val: unknown): asserts val is number {
  z.number().parse(val);
}

export function assertIsDefined<T>(val: T): asserts val is NonNullable<T> {
  if (val === undefined || val === null) throw new Error('Value is nullable.');
}

export function assertIsStringArray(val: unknown): asserts val is Array<string> {
  StringArraySchema.parse(val);
}