Variable instanceOfAssertion`Const`

instanceOfAssertion: AssertionFunctionSync<
    readonly [
        readonly ["to be an instance of", "to be a", "to be an"],
        ZodCustom<Constructor, Constructor>,
    ],
    (_: unknown, ctor: Constructor) => ZodCustom<Constructor, Constructor>,
    readonly [
        ZodUnknown,
        PhraseLiteralChoiceSlot<
            readonly ["to be an instance of", "to be a", "to be an"],
        >,
        ZodCustom<Constructor, Constructor>,
    ],
> = ...

Assertion for testing if a value is an instance of a specific constructor.

Example

expect(new Date(), 'to be an instance of', Date); // passes
expect('hello', 'to be a', String); // fails