fix: update getExpirationDate so touch applies

[bradtaniguchi]

• Used copilot running ontop of gemini 2.5 pro (preview) to try out fixing this issue as I'm less versed in this part of the codebase. Suggesting this PR as a starting point, will keep in draft until verified. (I may utilize tests and pound the pipeline to validate this change)

Fix: #82

[Copilot]

Pull Request Overview

This PR addresses issue #82 by updating the behavior of getExpirationDate in the session store to ensure that the session touch operation properly applies the expiration reset. The key changes include:

• Reordering of imports for clarity.
• Updated getExpirationDate implementation that prioritizes sessionCookie.expires if it's a Date, falls back to sessionCookie.maxAge, and otherwise uses the default TTL.

Comments suppressed due to low confidence (1)

src/store.ts:1

• [nitpick] Consider verifying that the updated import order adheres to your project's ordering guidelines for consistency across the codebase.

import session, { Store as ExpressSessionStore, SessionData } from 'express-session';

[bradtaniguchi]

At a glance the change seems sensible.

I dislike the original implementation's use of an OR leading directly into a ternary as that's somewhat confusing (I got tripped up as I wasn't completely sure if the OR takes precedent over the rest of the ternary)

I'll have to review the docs on the provided cookie and maybe cross check this sort of change with other session stores.

For the most part, pretty sane changes from AI here.

[JLuboff]

Looks okay to me, and is passing tests locally...

[bradtaniguchi]

So I skimmed the express-session docs here:
https://github.com/expressjs/session?tab=readme-ov-file#session-store-implementation

I've had a busy weekend, so will go over this more in-depth.

The docs also gave one example, the redis-store, so I checked out their implementation as a reference:
https://github.com/tj/connect-redis/blob/536b465d2cc590a3a6877b816335051da7aeb4df/index.ts#L133

Will re-read both sometime this week.