Upgrades dependencies to latest + changes required to support latest versions

[etiennenoel]

Here's a list of things this PR does:

• Upgrade to Typescript 5.8.3
  • Adds support for es2020 and esnext
  • Updates tslib to latest
• Upgrade eslint + prettier to latest version
  • Migrates eslint config to js file
  • Fixes linting in entire project to match latest rules
• Removes support for NodeJS lower than 18 (they are unsupported)

Not sure if you want to merge it now, but this gives us an idea of what needs to happen to update the dependencies. I feel like updating the dev dependencies is useful.

However, this also updates tslib and I need to understand better what the implications of doing that are. Does that mean we should do a major upgrade? If yes, then I can start planning about features we would want to include if we decide to go down that route.

[Copilot]

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[etiennenoel]

@Xapphire13 This is just an idea of upgrading the dependencies and removing support for older NodeJS versions. I don't think I would merge it now, but if we move towards a new major version, maybe this is part of this new version? Let me know your thoughts and I can also start preparing some ideas for this next major version.

[MeltingMosaic]

I think this would be a major version upgrade. There's a risk of breaking changes with older TS versions. @Xapphire13 and I discussed this a few years back and I recall we decided that if we did get to doing full TS5 support we'd up the major version.

[etiennenoel]

I agree. I think it's worth planning this properly. Then, what I think I can do, is not to merge this on master but merge this in a 5.x.x branch so we can see how this project could evolve and then decide if it makes sense or not to continue.