Function assertInstance

assertInstance<C extends AnyConstructor>(
    value: unknown,
    ctor: C,
    message?: string,
): asserts value is InstanceType<C>
Narrows an unknown value to instance of constructor type T if it is type-compatible, or raises an error otherwise.
Type Parameters
- C extends AnyConstructor
Parameters
- value: unknown
  The value to test.
- ctor: C
- Optionalmessage: string
  The error message to use if value is not type-compatible.
Returns asserts value is InstanceType<C>

Throws
AssertionFailedError If the value was undefined.
- Defined in narrowing/assert.ts:152