Variable functionArityAssertionConst

functionArityAssertion: AssertionFunctionSync<
    readonly [
        ZodCustom<
            (...args: unknown[] | readonly unknown[]) => unknown,
            (...args: unknown[] | readonly unknown[]) => unknown,
        >,
        "to have arity",
        ZodInt,
    ],
    (
        subject: (...args: unknown[] | readonly unknown[]) => unknown,
        expectedArity: number,
    ) => { actual: number; expected: number; message: string } | undefined,
    readonly [
        ZodCustom<
            (...args: unknown[] | readonly unknown[]) => unknown,
            (...args: unknown[] | readonly unknown[]) => unknown,
        >,
        PhraseLiteralSlot<"to have arity">,
        ZodInt,
    ],
> = ...

expect((a, b) => a + b, 'to have arity', 2); // passes
expect((a, b, c) => a + b + c, 'to have arity', 2); // fails
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