fix: remove cookies that expire at epoch time of 0

[colincasey]

The logic for checking and removing expired cookies fails when the cookie has an expiry date set to the epoch time of 0 (i.e.; Thu, 01 Jan 1970 00:00:00 GMT). This is because the branch check that triggers cookie removal was testing expiryTime which is falsy for a value of 0 and that short-circuits the logic.

This PR updates the logic to narrow the type of expiryTime from number | undefined to number using expiryTime != undefined which allows the 0 value to proceed to the subsequent condition and trigger the cookie removal.

Fixes #455

[EZaykov]

Iam not sure but it seems like this fix did not showed up (at least in compiled js). New to github sry xD

In node_modules its still if (expireCheck && expiryTime && expiryTime <= now).

Made small patch in my store for now:

function patchExpireTime(cookie: Cookie): Cookie {
	const original = cookie.expiryTime;

	cookie.expiryTime = (now?: Date) => {
		const result = original.call(cookie, now);

		if (result === 0) {
			return 1;
		}

		return result;
	};

	return cookie;
}

Waiting for update

[colincasey]

@EZaykov this fix is in the latest release (v5.1.0)