For smooth upgrade of tech stack the following notes would help with understanding which technologies we are using and how to maintain or upgrade them.
Susy 2 is no longer maintained. This is deprecated around 2017. Susy 3 exists but it is better to move to another type of grid system.
It is used in _src/_sass/layout/_config.scss as global defaults
$susy: ( columns: 12, gutters: 1.953125, math: fluid, output: float, gutter-position: inside );
Recommendation: Investigate whether we could use a more stable grid system.
We are already using the latest version. Website at https://gulpjs.com/
version 4.0.2 was release in May 2019. There are documentation related commits in the gulp repo in the last six months.
16.x is currently used. 16.x will be end of life by 2022.
Recommendation: Try to switch to nodejs 18.x in future.
noUiSlider is a javascript library for range slider. Version used in this project 8.3.0 - 2016-02-14 17:37:20. The latest version is 15.5.0 (Oct 2021).
Recommendation: Check whether this library is used and upgrade to the latest
normalize.css is v3.0.3 (2015) to this project.
Recommendation: Upgrade to 8.0.1 version last released Nov 2018
Jquery
_src/_scripts/jquery-2.1.1.min.js, version v2.1.1 (2014). Upgrade to latest version_src/_scripts/jquery.fitvids.js, version v1.1 (2013). For fitting the video. If possible avoid this one._src/assets/css/jquery-ui.css, version v1.12.1 (2017-05-24). Upgrade to latest version.