Function assertInstanceOf

packages/vitest/src/utils.ts:83–91

(
  value: unknown,
  constructor: C,
  message?: string,
  ..._: Array<never>
)

 * @since 0.21.0
 */
export function assertInstanceOf<C extends abstract new(...args: any) => any>(
  value: unknown,
  constructor: C,
  message?: string,
  ..._: Array<never>
): asserts value is InstanceType<C> {
  // @ts-ignore
  vassert.instanceOf(value, constructor, message)
}

/**
 * Asserts that `self` is `true`.